Roland AC-60 Acoustic Chorus Guitar Amplifier Manual

Before using this unit, carefully read the sections entitled:

• IMPORTANT SAFETY INSTRUCTIONS
• USING THE UNIT SAFELY
• IMPORTANT NOTES

These sections provide important information concerning the proper operation of the unit. Additionally, in order to feel assured that you have gained a good grasp of every feature provided by your new unit, Owner's manual should be read in its entirety. The manual should be saved and kept on hand as a convenient reference.

Main Features

The AC-60 is a compact, high-performance monitor amp developed exclusively for use with acoustic instruments.
It fully presents the harmonic richness of tone characteristic of acoustic instruments.

Compact, High-Performance Stereo Amp

• Comes equipped with two specially developed 16-cm (6.5-inch) wide-range speakers.
• Features stereo output (30 W + 30 W).
• Housed in a bass-reflex cabinet.

Features Two Independent Channels, GUITAR and MIC/LINE

• Each channel includes a 3-band equalizer.
• GUITAR channel handles both piezo and magnetic pickups.
• The MIC/LINE channel features phantom power, utilizing highly reliable, dedicated 48 V-output phantom circuitry.
• Using the MIC/LINE channel for LINE input allows you to connect guitars with magnetic pickups. You can use a single guitar's piezo and magnetic pickups simultaneously and mix (blend) the sounds together.

High-Quality Digital Effects

• Includes three types of stereo chorus: "SPACE," whereby the chorus is synthesized in actual space; "RICH," in which the amount of the effect is applied separately in each frequency range; and "WIDE," which provides an enhanced sense of expansiveness using discrete frequency bands.
• Includes stereo reverb developed especially for acoustic instruments, which gives a sense of spaciousness and natural body to the sound.
• Also features a delay effect developed especially for acoustic instruments, which produces a soft, tuned sound.
• Furthermore, you can connect an optional foot switch and use it to turn these effects on and off.

Anti-Feedback Suppresses Feedback

• Anti-feedback features two ways to detect the feedback point, using the "Manual settings," or the "Auto settings," which allow the feedback point to be detected automatically.
• You can connect an optional foot switch and use your foot to operate this feature.

Mute Function

• The Mute switch provided makes it easy for you to mute the sounds for the AC-60's own speakers as well as the sounds from LINE OUT. By using the Mute function, you can plug in and out noiselessly at the guitar. Furthermore, when you have a tuner connected to TUNER OUT, the Mute function lets you tune your instrument without outputting any sound.
• You can connect an optional foot switch and use your foot to turn this on and off.

External Input Jacks (AUX IN)

• Includes external input jacks, allowing you to connect a CD player, backing machine, or other device in stereo.
• These include both RCA phono jacks and 1/4" phone jacks, making it possible to connect just about any kind of device.

Multiple Output Connectors

• Features DI out that allow you to output directly the signals input from connected instruments and mics. You can also connect a tuner. Compatible with TRS balanced output.
• Line outs feature 1/4" phone mono-output jacks in addition to XLR connectors for stereo output. You can use a single AC-60 for all applications.
• It also features a subwoofer out. Connecting a powered subwoofer allows you to play with an even punchier, more powerful low end.
• The amp also includes a headphones out that you can use when playing during nighttime hours and when making sound checks.

Convenient Placement Features

• Includes an "folding stand" that allows you to change the angle of the amp when using it for monitoring purposes.
• It also includes a "speaker stand adapter," which allows you to attach the AC-60 to a speaker stand. This makes using the AC-60 easier when you are performing standing up, and allows you to use the amp as a simple PA.
• Also included is a carrying case for greater portability.

Names of Things and What They Do

Control Panel

1. INPUT
   (GUITAR CHANNEL)
   Connect guitars here.
   (MIC/LINE CHANNEL)
   Connect mics and line-level devices here. You can also connect guitars with pickups equipped with preamps.
   This handles balanced input, so you can connect 1/4" phone TRS jacks and XLR-type connectors.
   
   
   You can use the two channels in combination.
   Refer to "Example of Using Two Channels Combined".
2. PICKUP button
   This switches the input circuitry for either piezo or magnetic pickups, according to the type of pickup on the connected guitar. Press down the button for magnetic pickups.
   * Set this to MAGNETIC if your guitar has an active pickup equipped with a preamp.
3. SHAPE button
   Setting this to ON modifies the midrange to create a bright tone suitable for strumming chords.
   This emphasizes brushing sounds, allowing you to strum with a more edgy feeling.
4. PHANTOM switch
   This turns the phantom power on and off.
   Set this to "ON" when connecting mics that require phantom power (condenser mic, etc.).
   Set this to "OFF" when connecting mics that do not require phantom power or other devices.
   
   • Use the following sequence when connecting mics that require phantom power:
     1. Turn the PHANTOM switch off.
     2. Connect the mic.
     3. Turn the PHANTOM switch on.
   • Supplying phantom power to mics that do not require it or supplying it to other devices may cause such equipment to malfunction. Always be sure to turn the switch off before connecting.
     *To protect the circuitry, all output is muted momentarily after the PHANTOM switch is turned on or off.
     * Phantom power is supplied only to the XLR connectors for the MIC/LINE channel INPUT.
     * Noise may be produced if connectors are connected or disconnected while the phantom power is turned on.
     Phantom Power
     Because they have a comparatively wider range and better sound quality than dynamic mics, condenser mics are often used for miking acoustic guitars. However, they require a power source to operate. Although some condenser mics run off batteries placed within the mic housing, in many cases a type of power supply known as "phantom power" is required. This power supply uses the existing mic cable to feed power.
     The AC-60's phantom power is output at a constant 48 V, so it conforms to professional specifications required at recording studios.
5. SELECT button
   This switches the input level to match that of the connected device (mic or line).
   You can connect guitars with magnetic pickups when LINE is selected with the SELECT button.
   * Note that the volume is increased if the switch is set to "MIC" when you have a line-level device connected.
6. VOLUME knob
   * When using the AC-60 with the GUITAR channel and MIC/ LINE channel mixed, adjust the volume balance between the two channels with the VOLUME knob.
   (GUITAR CHANNEL)
   This adjusts the volume of the GUITAR channel.
   * To accommodate the lower output of piezo pickups, the volume level when the VOLUME knob is between the 7 and 10 positions is set somewhat higher when the PICKUP button is set to PIEZO in comparison with the MAGNETIC setting.
   (MIC/LINE CHANNEL)
   This adjusts the volume of the MIC/LINE channel.
7. BASS knob
   This adjusts the level of the low-frequency range.
   Turning the knob to the right (clockwise) emphasizes the feeling of body in the sound.
8. MIDDLE knob
   This adjusts the level of the midrange.
   Turning the knob to the right creates a fatter sound when melodies or individual notes are played.
9. TREBLE knob
   This adjusts the level of the high-frequency range.
   Turning the knob to the right emphasizes brushing sound when chords are stroked.
   
   The tone of acoustic instruments varies immensely from one instrument to the next. The kind of sound required also varies according to how an instrument is being used in a particular ensemble. Actively use the BASS, MIDDLE, and TREBLE knobs to adjust the tone to suit the instrument you are using and the conditions in which it is being used.
   (Example)
   • When using the AC-60 with the speaker stand attached, you may want to turn up the BASS knob so the lower range is perceived better.
   • If the sound seems too harsh, such as immediately after changing strings, you may want to turn down the TREBLE knob to cut back on the high frequencies.
10. CHORUS button
    This turns the chorus on and off.
    The indicator lights up when this is on.
    
    You can use a foot switch (the optional BOSS FS-5U) to switch the chorus on and off. Turning the chorus on and off with the foot switch works on both channels.
11. CHORUS knob
    You can switch between the three types of chorus (SPACE, RICH, and WIDE) by setting this knob.
    You can adjust the amount of effect applied by changing the position of the knob.
    * This is enabled when the CHORUS button is in the ON position.
    * The markings indicating the SPACE and RICH positions are approximate. Listen to the sound to confirm the effect as you make adjustments.
    SPACE
    This is a spacially synthesized chorus. With spacially synthesized chorus, a method available only in stereo, the chorus effect is created by taking the sound from the right speaker, from which the effect sound is output, and the sound from the left speaker, which outputs the direct sound, and then mixing them in the actual space. This creates a greater lateral spread than that produced when the sounds are mixed electronically, providing a more natural sense of breadth.
    RICH
    This is a stereo chorus that is divided into three frequency ranges.
    Here, the effect is separated into three bands, low-frequency, midrange, and high-frequency, and by applying the most suitable amount of chorus effect in each range, it provides a sense of fullness and breadth that is perfectly suited to the acoustic guitar.
    The low end is firmly in the center, and sound spreads out more and more as the sound rises from the midrange up through the higher frequencies.
    WIDE
    While also relying on the division of sound into separate bands, this chorus offers even greater expansiveness than RICH.
    The sound image spreads beyond the AC-60's speakers, producing an effect that seems to envelope the listener in sound.
12. REVERB/DELAY knob
    You can adjust this knob to switch between the reverb and delay effects.
    You can adjust the amount of effect applied by changing the position of the knob.
    * Turn the knob to "OFF" if you are not using the reverb or delay effect.
    * The markings indicating the reverb and delay positions are approximate. Listen to the sound to confirm the effect as you make adjustments.
    REVERB
    This stereo reverb, developed especially for acoustic instruments, gives a sense of spaciousness and natural sonic quality.
    Turn the knob to adjust the volume of the reverb effect.
    DELAY
    This delay, developed especially for acoustic instruments, adds soft reflections to the original sound.
    Turn the knob to change the delay time.
    * You can use a foot switch (the optional BOSS FS-5U) to switch the reverb and delay on and off.
13. FREQUENCY knob
    This selects the frequency at which the anti-feedback function operates.
    Use the knob to switch between automatic and manual settings for the operational frequency.
    
    * Turn the knob to "OFF" if you are not using anti-feedback.
14. START button
    This starts automatic detection of the feedback point.
    The indicators show the operating status of the automatic detection function.
    Standby: Flashes slowly
    During Detection: Flashes rapidly
    After Detection: Remains lit
    * Holding down the START button for one second or longer puts automatic detection in standby.
    ANTI-FEEDBACK
    
    Anti-feedback is a function that controls feedback that arises between the guitar or mic and the amp.
    The feedback is suppressed by attenuating the frequency at which the feedback occurs.
    * This is not designed to work with respect to the high-frequency feedback that can occur when using microphones.
    Anti-feedback can be used in two different ways; you can make use of either the "Auto settings" or the "Manual settings."
    Feedback
    This is a phenomenon where signals output from the speakers are then picked up again by the mic or pickup, and the sound is further amplified and output from the speakers, resulting in an unpleasant oscillating sound.
    * If the anti-feedback alone does not control the feedback, adjust your settings, for example by lowering the volume or cutting the low frequencies.
    • Setting the Feedback Point Automatically
      You can have the frequency at which the feedback is suppressed be determined automatically.
      * Use in conditions where feedback occurs.
      1. Turn the FREQUENCY knob to the "AUTO" position.
         
         The ANTI-FEEDBACK indicator flashes slowly, and automatic detection goes into standby.
      2. Press the START button.
         Automatic detection of the feedback point starts. The indicator flashes rapidly when detection is in progresses, and when the feedback point is found, the indicator lights steadily. If no feedback point is detected, the indicator flashes slowly, and the automatic detection function returns to standby.
      3. Press the START button once more to conduct the automatic detection again.
    • Setting the Feedback Point Manually
      Turn the knob to select the frequency at which the feedback is to be suppressed.
      Turn the knob, moving through the range of L through H (the ANTI-FEEDBACK indicator lights up) to set the frequency at which the feedback is to be suppressed.
      
      The frequency to which the anti-feedback function is applied increases as the knob is turned to the right.
      
      You can use a foot switch (the optional BOSS FS-5U) to run automatic detection of the feedback frequency or to turn the anti-feedback function on and off.
      
      You can use anti-feedback even when feedback is not a problem. For example, you can use it to remove undesirable resonance in the low to midrange, as well as correct other problems with the sound quality.
15. MUTE button
    This switches the Mute function on and off.
    When you press the button, the MUTE indicator flashes, muting is turned on, and the speaker output and sounds from SUB WOOFER OUT and LINE OUT are muted.
    With the mute function activated, you do not need to turn down the VOLUME knob or MASTER knob to mute the noise when plugging into, or unplugging from your guitar.
    * Sounds from the DI OUT/TUNER OUT and PHONES jacks are not muted.
    
    By connecting a tuner (optional) to DI OUT/TUNER OUT and then pressing the MUTE button, you can tune your instrument without the sound being output from the speakers.
    
    You can use a foot switch (the optional BOSS FS-5U) to switch muting on and off.
16. MASTER knob
    This adjusts the volume from the speakers, PHONES, and SUB WOOFER OUT.
17. PHONES jack
    Headphones are connected here. No sounds are output from the speakers or from SUB WOOFER OUT when headphones are connected.
18. POWER switch
    This turns the AC-60's power on and off.
    The POWER indicator lights up when the power is on.
    * This unit is equipped with a protection circuit. A brief interval (a few seconds) after power up is required before the unit will operate normally.
    * If you need to turn off the power completely, first turn off the POWER switch, then unplug the power cord from the power outlet. Refer to Power Supply.

Rear Panel

1. LINE OUT jack
   You can connect a mixer, recording device, or other such device here. The output level is +4 dBu.
   Included here are XLR connectors (L/R: stereo output) and 1/4" phone jacks (mono output).
   
   * You cannot adjust the volume for LINE OUT with the MASTER knob.
   * When outputting stereo sounds from LINE OUT, you may not be able to achieve the same effect with sounds of spacially synthesized chorus (SPACE, WIDE) that you get when these sounds are played through the AC-60's own speakers.
2. SUB WOOFER OUT jack
   You can connect a powered subwoofer to play back sounds with an even punchier, more powerful low end.
   The volume is adjusted with the MASTER knob.
3. AUX IN jack
   You can connect a CD player, backing machine, or other device and play back sounds in stereo. Inputs feature both RCA phono jacks and 1/4" phone jacks. When only the left 1/4" phone jack is connected, playback is in mono.
   Although the input from AUX IN is output from the speakers, PHONES, and SUB WOOFER OUT, it is not output from LINE OUT. The volume is adjusted with the MASTER knob and muting on/off for these sounds is controlled with the MUTE button.
   If devices are connected to both the RCA phono jacks and the 1/4" phone jacks, then the two inputs are mixed.
4. DI OUT/TUNER OUT jack
   The direct sound of the device or instrument connected to the GUITAR or MIC/LINE channel is output here. This is a 1/4" phone TRS jack with balanced output.
   You can also use this jack to connect a tuner.
   
   * If balanced output is not required, use a 1/4" phone (mono) plug to connect to this jack.
   If balanced output is not required, you can use the special connection cable (the optional PCS-31) to use the DI OUT and TUNER OUT simultaneously.
   
   
   Be sure to connect the tuner to COLD (red side of PCS-31).
5. FOOT SW jack
   The AC-60 accepts the FS-5L (latch type) and FS-5U (momentary type) foot switches.
   * Set the polarity switch as shown below.
   
   • (MUTE, ANTI-FEEDBACK)
     Using a special connection cable (the optional PCS-31) to connect two foot switches (the optional BOSS FS-5L and FS5U), you can use the FS-5L to switch muting on and off, and use the FS-5U to operate the anti-feedback function.
     
     When a 1/4" phone (mono) plug is used to connect only one foot switch, only the Mute on/off function is enabled. Connect an FS-5L for this.
     The MUTE button should be set to off when a foot switch is connected for muting.
     * You cannot switch the muting off by pressing the foot switch when the MUTE button is on (when the MUTE indicator is lit).
     * When using an FS-5U (momentary type) to switch muting on and off, the muting is switched on only while the switch is held down.
     The foot switch's function with anti-feedback is as shown below.
     • When the FREQUENCY knob is positioned in the range from L to H, the switch turns the anti-feedback function on and off.
     • When the FREQUENCY knob is positioned at AUTO, the switch functions as the START switch for the automatic detection. Holding the foot switch down for one second or longer returns the automatic detection function to standby mode.
   • (CHORUS, DELAY/REVERB)
     Using a special connection cable (the optional PCS-31) to connect two foot switches (the optional BOSS FS-5U), you can use one FS-5U to switch the chorus on and off, and use the other FS-5U to switch the delay or reverb on and off.
     
     When a 1/4" phone (mono) plug is used to connect only one foot switch, only the chorus on/off function is enabled.
     * The chorus on/off function works on both channels.
     * You cannot switch the chorus on and off by pressing the foot switch when the CHORUS button is off.

Example of Using Two Channels Combined

When Using One Guitar with Two Types of Pickups

GUITAR CHANNEL:
PiezoPickup (PICKUP button = PIEZO)

MIC/LINE CHANNEL:
Magnetic Pickup (SELECT button = LINE)

You can balance the volume levels using each channel's VOLUME knob, and adjust the tone for each pickup to attain the optimal sound with the equalizer (BASS/MIDDLE/TREBLE) knobs.

When Using a Mic and a Pickup

GUITAR CHANNEL:
Piezo or Magnetic Pickup

MIC/LINE CHANNEL:
Condenser or Dynamic mic (SELECT button = MIC)

This allows you to blend the fat midrange of the pickup with the mic's delicate high end.

Set the PHANTOM switch to ON if using a condenser mic.

When Using Two Guitars

GUITAR CHANNEL:
Guitar 1 - Piezo or Magnetic Pickup

MIC/LINE CHANNEL:
Guitar 2 - Magnetic Pickup (SELECT button = LINE)

You can switch guitars without having to readjust the volume and tone.

How to Use the Folding Stand

When using the AC-60 on floors, or in other low-lying positions, then setting up and using the folding stand can make it easier to hear the sounds from the speakers.

• When using the folding stand, always be sure to place it so the AC-60 remains level.
• When not using the folding stand, fold it up, and secure it to the bottom of the amp using the stoppers.
  

• Never lift up and carry the AC-60 by holding the folding stand.
• Never place any objects on top of the AC-60 when using the folding stand.

Using a Speaker Stand

By using a speaker stand, you can mount the AC-60 at the optimal height for use as a monitor speaker or simple PA device.

• The AC-60 is designed to be used only with speaker stands whose dimensions meet the specifications described below.
  Do not use it with a speaker stand that does not meet the following specifications.
  
• Before use, adjust the speaker stand to a height of 165 cm (65") or less and a leg spread of 120 cm (47-1/4") or more, as shown in the figure below.
  
• Using a speaker stand that does not meet the specifications at left or that is adjusted to a height over 165 cm (65"), or a leg spread of less than 120 cm (47-1/4") may result in damage to equipment or injury due to the stand tipping over.
• When using AC-60 with a speaker stand, the speaker stand must be carefully placed so it is level and sure to remain stable.
• Cables connected to AC-60 should be given enough slack to prevent accidents that might result from someone tripping over them.
• To prevent accidents due to falls, do not place any object on the AC-60 when it's mounted on a speaker stand.
• Always have at least one other person assist you when mounting the AC-60 on a speaker stand, or when adjusting the height of the stand while the AC-60 remains mounted on it.

Block Diagram

Specifications

Rated Power Output
30W + 30W

Nominal Input Level (1 kHz)
GUITAR Channel: -10 dBu
MIC/LINE Channel: -50 / -10 dBu
AUX IN: -10 dBu

Nominal Output Level (1 kHz)
DI/TUNER OUT: +4 dBu
LINE OUT: +4 dBu
SUB WOOFER OUT: +4 dBu
* 0 dBu = 0.775 Vrms

Speakers
16 cm (6.5 inches) x 2

Controls
(GUITAR Channel)
PICKUP Switch (PIEZO/MAGNETIC)
SHAPE Switch
VOLUME Knob
Equalizer Knobs (BASS, MIDDLE, TREBLE)
CHORUS Switch

(MIC/LINE Channel)
PHANTOM Switch
SELECT Switch (MIC/LINE)
VOLUME Knob
Equalizer Knobs (BASS, MIDDLE, TREBLE)
CHORUS Switch

CHORUS Knob
REVERB/DELAY Knob

(ANTI-FEEDBACK)
FREQUENCY Knob
START Button

MUTE Switch
MASTER Knob
POWER Switch

Indicator
CHORUS (GUITAR Channel, MIC/LINE Channel)
ANTI-FEEDBACK
MUTE
POWER

Connectors
GUITAR Channel Input Jack (1/4" phone type)
MIC/LINE Input Jack (XLR type, 1/4" phone type)
AUX IN Jacks (RCA phono type, 1/4" phone type)
DI/TUNER OUT Jack (1/4" TRS phone type)
LINE OUT Jacks (XLR type, 1/4" phone type)
SUB WOOFER OUT Jack (1/4" phone type)
PHONES Jack (1/4" TRS phone type)
FOOT SWITCH Jack (1/4" TRS phone type)

Power Supply
AC 117 V, AC 230 V, AC 240 V

Power Consumption
68 W

Dimensions
380 (W) x 270 (D) x 268 (H) mm
15 (W) x 10-11/16 (D) x 10-9/16 (H) inches

Weight
9.8 kg
21 lbs 10 oz

Accessory
Carrying Case
Owner's Manual

Options
Foot Switch: BOSS FS-5L (Mute On/Off), BOSS FS-5U
Connection Cable: PCS-31

* In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.

RISK OF ELECTRIC SHOCK DO NOT OPEN

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.

INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS.

When using electric products, basic precautions should always be followed, including the following:

1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any of the ventilation openings. Install in accordance with the manufacturers instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

For the U.K.

THIS APPARATUS MUST BE EARTHED

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE. GREEN-AND-YELLOW: EARTH, BLUE: NEUTRAL, BROWN: LIVE

As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows:

The wire which is coloured GREEN-AND-YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured GREEN or GREEN-AND-YELLOW.

The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK.

The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED.

USING THE UNIT SAFELY

INSTRUCTIONS FOR THE PREVENTION OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS

About and Notices

	Used for instructions intended to alert the user to the risk of death or severe injury should the unit be used improperly.
	Used for instructions intended to alert the user to the risk of injury or material damage should the unit be used improperly. * Material damage refers to damage or other adverse effects caused with respect to the home and all its furnishings, as well to domestic animals or pets.

About the Symbols

	The symbol alerts the user to important instructions or warnings. The specific meaning of the symbol is determined by the design contained within the triangle. In the case of the symbol at left, it is used for general cautions, warnings, or alerts to danger.
	The symbol alerts the user to items that must never be carried out (are forbidden). The specific thing that must not be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the unit must never be disassembled.
	The ● symbol alerts the user to things that must be carried out. The specific thing that must be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the power-cord plug must be unplugged from the outlet.

ALWAYS OBSERVE THE FOLLOWING

• Before using this unit, make sure to read the instructions below, and the Owner's Manual.
• Connect mains plug of this model to a mains socket outlet with a protective earthing connection.
• Do not open or perform any internal modifications on the unit.
• Do not attempt to repair the unit, or replace parts within it (except when this manual provides specific instructions directing you to do so). Refer all servicing to your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the "Information" page.
• Never use or store the unit in places that are:
  • Subject to temperature extremes (e.g., direct sunlight in an enclosed vehicle, near a heating duct, on top of heat-generating equipment); or are
  • Damp (e.g., baths, washrooms, on wet floors); or are
  • Humid; or are
  • Exposed to rain; or are
  • Dusty; or are
  • Subject to high levels of vibration.
• The unit should be connected to a power supply only of the type described in the operating instructions, or as marked on the rear side of unit.
• Do not excessively twist or bend the power cord, nor place heavy objects on it. Doing so can damage the cord, producing severed elements and short circuits. Damaged cords are fire and shock hazards!
• This unit, either alone or in combination with an amplifier and headphones or speakers, may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level, or at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should immediately stop using the unit, and consult an audiologist.
• Do not allow any objects (e.g., flammable material, coins, pins); or liquids of any kind (water, soft drinks, etc.) to penetrate the unit.
• To avoid overheating and possible fire and shock hazards, the AC-60 must not be used in an enclosure with less than 50 cm air spacing from all sides.
• Immediately turn the power off, remove the power cord from the outlet, and request servicing by your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the "Information" page when:
  • The power-supply cord, or the plug has been damaged; or
  • If smoke or unusual odor occurs
  • Objects have fallen into, or liquid has been spilled onto the unit; or
  • The unit has been exposed to rain (or otherwise has become wet); or
  • The unit does not appear to operate normally or exhibits a marked change in performance.
• In households with small children, an adult should provide supervision until the child is capable of following all the rules essential for the safe operation of the unit.
• Protect the unit from strong impact. (Do not drop it!)
• Do not force the unit's power-supply cord to share an outlet with an unreasonable number of other devices. Be especially careful when using extension cords—the total power used by all devices you have connected to the extension cord's outlet must never exceed the power rating (watts/amperes) for the extension cord. Excessive loads can cause the insulation on the cord to heat up and eventually melt through.
• Never lift up and carry the AC-60 by holding the folding stand.
• Before using the unit in a foreign country, consult with your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the "Information" page.
• Do not put anything that contains water (e.g., flower vases) on this unit. Also, avoid the use of insecticides, perfumes, alcohol, nail polish, spray cans, etc., near the unit. Swiftly wipe away any liquid that spills on the unit using a dry, soft cloth.

• The unit should be located so that its location or position does not interfere with its proper ventilation.
• Always grasp only the plug on the power-supply cord when plugging into, or unplugging from an outlet.
• At regular intervals, you should unplug the power plug and clean it by using a dry cloth to wipe all dust and other accumulations away from its prongs. Also, disconnect the power plug from the power outlet whenever the unit is to remain unused for an extended period of time. Any accumulation of dust between the power plug and the power outlet can result in poor insulation and lead to fire.
• Try to prevent cords and cables from becoming entangled. Also, all cords and cables should be placed so they are out of the reach of children.
• Never climb on top of, nor place heavy objects on the unit.
• Never handle the power cord or its plug with wet hands when plugging into, or unplugging from, an outlet.
• Before moving the unit, disconnect the power plug from the outlet, and pull out all cords from external devices.
• Before cleaning the unit, turn off the power and unplug the power cord from the outlet.
• Whenever you suspect the possibility of lightning in your area, pull the plug on the power cord out of the outlet.
• Always turn the phantom power off when connecting any device other than condenser microphones that require phantom power. You risk causing damage if you mistakenly supply phantom power to dynamic microphones, audio playback devices, or other devices that don't require such power. Be sure to check the specifications of any microphone you intend to use by referring to the manual that came with it.
  (This instrument's phantom power: 48 V DC, 10 mA Max)
• Do not remove the speaker grille and speaker by any means. Speaker not user replaceable. Shock hazardous voltages and currents are present inside the enclosure.

IMPORTANT NOTES

In addition to the items listed under "IMPORTANT SAFETY INSTRUCTIONS" and "USING THE UNIT SAFELY", please read and observe the following:

Power Supply

• Do not connect this unit to same electrical outlet that is being used by an electrical appliance that is controlled by an inverter (such as a refrigerator, washing machine, microwave oven, or air conditioner), or that contains a motor. Depending on the way in which the electrical appliance is used, power supply noise may cause this unit to malfunction or may produce audible noise. If it is not practical to use a separate electrical outlet, connect a power supply noise filter between this unit and the electrical outlet.
• Before connecting this unit to other devices, turn off the power to all units. This will help prevent malfunctions and/or damage to speakers or other devices.
• Although the LEDs are switched off when the POWER switch is switched off, this does not mean that the unit has been completely disconnected from the source of power. If you need to turn off the power completely, first turn off the POWER switch, then unplug the power cord from the power outlet. For this reason, the outlet into which you choose to connect the power cord's plug should be one that is within easy reach and readily accessible.

Placement

• Using the unit near power amplifiers (or other equipment containing large power transformers) may induce hum. To alleviate the problem, change the orientation of this unit; or move it farther away from the source of interference.
• This device may interfere with radio and television reception. Do not use this device in the vicinity of such receivers.
• Noise may be produced if wireless communications devices, such as cell phones, are operated in the vicinity of this unit. Such noise could occur when receiving or initiating a call, or while conversing. Should you experience such problems, you should relocate such wireless devices so they are at a greater distance from this unit, or switch them off.
• Do not expose the unit to direct sunlight, place it near devices that radiate heat, leave it inside an enclosed vehicle, or otherwise subject it to temperature extremes. Also, do not allow lighting devices that normally are used while their light source is very close to the unit (such as a piano light), or powerful spotlights to shine upon the same area of the unit for extended periods of time. Excessive heat can deform or discolor the unit.
• When moved from one location to another where the temperature and/or humidity is very different, water droplets (condensation) may form inside the unit. Damage or malfunction may result if you attempt to use the unit in this condition. Therefore, before using the unit, you must allow it to stand for several hours, until the condensation has completely evaporated.
• Do not allow rubber, vinyl, or similar materials to remain on the unit for long periods of time. Such objects can discolor or otherwise harmfully affect the finish.
• Do not paste stickers, decals, or the like to this instrument. Peeling such matter off the instrument may damage the exterior finish.
• Do not allow objects to remain on top of the unit while it is in operation.

Maintenance

• For everyday cleaning wipe the unit with a soft, dry cloth or one that has been slightly dampened with water. To remove stubborn dirt, use a cloth impregnated with a mild, non-abrasive detergent. Afterwards, be sure to wipe the unit thoroughly with a soft, dry cloth.
• Never use benzine, thinners, alcohol or solvents of any kind, to avoid the possibility of discoloration and/or deformation.

Additional Precautions

• Use a reasonable amount of care when using the unit's buttons, sliders, or other controls; and when using its jacks and connectors. Rough handling can lead to malfunctions.
• When connecting / disconnecting all cables, grasp the connector itself—never pull on the cable. This way you will avoid causing shorts, or damage to the cable's internal elements.
• A small amount of heat will radiate from the unit during normal operation.
• To avoid disturbing your neighbors, try to keep the unit's volume at reasonable levels. You may prefer to use headphones, so you do not need to be concerned about those around you (especially when it is late at night).
• When you need to transport the unit, package it in the box (including padding) that it came in, if possible. Otherwise, you will need to use equivalent packaging materials.
• Some connection cables contain resistors. Do not use cables that incorporate resistors for connecting to this unit. The use of such cables can cause the sound level to be extremely low, or impossible to hear. For information on cable specifications, contact the manufacturer of the cable.
• To prevent malfunction and/or damage to speakers or other devices, always turn down the volume, and turn off the power on all devices before making any connections.
• Once the connections have been completed, turn on power to your various devices in the order specified. By turning on devices in the wrong order, you risk causing malfunction and/or damage to speakers and other devices.
  When powering up:
  Turn on the power to the AC-60 last.
  When powering down:
  Turn off the power to the AC-60 first.
• This unit is equipped with a protection circuit. A brief interval (a few seconds) after power up is required before the unit will operate normally.
• Wrap the AC cord around the cord hook when trans-porting or storing the unit.
• If you need to turn off the power completely, first turn off the POWER switch, then unplug the power cord from the power outlet. Refer to Power Supply.