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Practical Devices XM4 User Manual

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XM4
Headphone Amplifier
User's Manual

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Summary of Contents for Practical Devices XM4

  • Page 1 Headphone Amplifier User’s Manual...
  • Page 2 We’ve worked very hard to provide you with what may be one of the most advanced, feature packed, and best sounding headphone amplifiers on the market today. The XM4 is designed to be durable, flexible, easy to use, practical, and above all, sound great. Each unit is carefully manufactured, and then rigorously tested for performance, durability, and sound quality.

  • Page 3: Table Of Contents

    Table of Contents XM4 Block Diagram ....4 Connecting Your XM4 ....5 Power Button Functions ....6 Crossfeed Controls......7 Disassembling the Unit....8 Replacing the Battery ....9 Gain Boost Jumpers ....10 Lithium Battery Charger.....11 External Power Supply ....12 Testing the Battery ....13 Frequently-Asked Questions ..14 Troubleshooting......15...

  • Page 4: Xm4 Block Diagram

    XM4 Block Diagram Power Button Amber LED Press button: Flashes battery voltage when Power Button 1 time = Turn on power for 1 hour is pressed. 3 times = Turn on power for 3 hours 6 times = Turn on power for 6 hours...

  • Page 5: Connecting Your Xm4

    Connecting Your XM4 1. Connect a suitable source to the input jack, as pictured. Sources may be MP3 or CD players, iPods, or any line-level devices. 2. Connect your headphones to the output jack. Your headphones can have an impedance of 24 to 600 ohms.

  • Page 6: Power Button Functions

    3 presses: Turn unit on for three hours. 6 presses: Turn unit on for six hours. 7 presses: Turn unit on. The XM4 will not turn itself off. Press and hold: Turn unit off. The unit will respond to button presses by flashing the blue LED once for each hour it will stay on.

  • Page 7: Crossfeed Controls

    CrossFeed Controls Crossfeed Enable Switch Crossfeed Adjuster The XM4’s Crossfeed circuit simulates the sound stage of loudspeakers, through your headphones. Press the Switch IN to activate Crossfeed. • Leave the button OUT for full stereo operation, • bypassing the Crossfeed circuit entirely.

  • Page 8: Disassembling The Unit

    Disassembling the Unit If you need to change the Gain Boost Jumpers or Battery Charger Jumper, you will need to disassemble the unit. Here's how: Turn the unit off, and remove the external power adapter if connected. Remove the rear panel using a Phillips screwdriver.

  • Page 9: Replacing The Battery

    Replace the battery by removing the rear panel, using a Philips screwdriver. Connect the battery clip to the new battery • Insert the battery clip-first into the XM4 • The battery should not protrude out of the rear of the unit (if it •...

  • Page 10: Gain Boost Jumpers

    Gain Boost Jumpers Gain Boost With the volume knob at full, your XM4 will Jumpers deliver +13dB of gain. Additionally, you can install the Gain Boost jumpers, which will give you an extra +10dB of gain, for a total of +23dB.

  • Page 11: Lithium Battery Charger

    The battery will fully charge within two hours. When charging is finished, the LED on the charger will turn from red to green. • The battery will charge even if the XM4 is turned on. • You can leave the charger connected indefinitely.

  • Page 12: External Power Supply

    External Power Supply If your XM4 did NOT come with the Lithium system, then it shipped from the factory with an Industrial Alkaline 9v battery. You can use an external power supply to save battery life while you are at home.

  • Page 13: Testing The Battery

    Testing the Battery The XM4 also acts as a battery tester. When the XM4 is turned on, the amber LED will display the battery voltage by flashing. For example, if the voltage is 8.5 volts, the LED will flash 8 times, then 5 times.

  • Page 14: Frequently-Asked Questions

    Frequently-Asked Questions Can I use a line-level input to the XM4, such as from a CD/ DVD player or VCR? Yes, the XM4 will accept a line-level input. Can I use the XM4 to drive speakers? Usually, no. The XM4 was designed as a headphone...

  • Page 15: Troubleshooting

    Troubleshooting Here are some common problems, and their solutions: Amp does not turn on or respond to pushing the power button: Disconnect the battery, hold down the power button for 10 seconds, then reconnect the battery. Headphone volume is too quiet, even with the volume knob at full: Increase volume of source (MP3 player).
  • Page 16 Notes...

  • Page 17: Warranty And Guarantee

    Practical Devices stands behind its products with a full no-risk warranty and money-back satisfaction guarantee. Practical Devices offers a 30-day money-back guarantee on all of our products. If, for any reason whatsoever, you are unsatisfied with your purchase, you may return it for your money back, including your original shipping cost.

  • Page 18: Technical Specifications

    Specifications Description: Portable Audio Headphone Amplifier Weight: 140 grams (4.9 oz) Power Source: - 9-volt alkaline, NiMH, NiCd battery, or, - 8.4-volt NiMH or NiCD battery, and/or, - External Power Supply. - Option Lithium Rechargeable System External Power Supply: 1.3mm Barrel connector power jack, center pin positive.
  • Page 19 Specifications (Continued) Dynamic Range 100dB (20-20,000Hz, typical): Bass Boost +6dB @ 100Hz User-adjustable from mono to stereo using potentiometer; Crossfeed User can bypass using pushbutton. Auto Power-OFF User selects between 1, 3, or 6 hour poweroff interval, or unit can be set to stay on indefinitely Status Indicators Two LEDS (one blue, one amber)
  • Page 20 XM4_v35 ©2007 www.practicaldevices.com...

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