Technics SB-G90 - Speaker System Manual

Accessories

Before use, be sure to attach the base plates and either the spikes or the rubber foot.

• Product numbers provided in this Owner's Manual are correct as of February 2017. These may be subject to change.
• The speakers are not supplied with speaker cables. For connection, use commercially-available speaker cables.

About this unit

Names of parts and features of the speakers

1. Balanced Driver Mounting Architecture
   The speaker unit, mounted on the sub-baffle inside the cabinet at its center of gravity, is designed to suppress the vibration it generates. The speaker unit is not mounted on the front baffle to minimize the tranmission of unwanted vibration from the speaker unit to the baffle. The result is a speaker that delivers a realistic, spacious soundstage made of penetrating and crisp sound with frequencies ranging from low to super-high.
2. Coaxial Two-Way Unit
   The newly developed mid-to-high frequency unit features a coaxial two-way system that inherits the design concepts developed for our high-end models: a point sound source and linear phase reproduction. The system, which is designed for accurate sound localization, allows the speaker to deliver various sounds produced by musical instruments with clarity to recreate a three-dimensional soundstage.
3. Low Distortion Long Stroke Woofers
   The speaker incorporates two woofers made of components such as double-magnets, long-voice coils, and copper rings. As a result, the speaker can deliver bass sound that offers low distortion and superb response in reproducing frequencies even with large amplitude.

Recommended devices

We recommend using Technics devices (optional) for superior audio quality.

Installation

e.g.,

• Each speaker must be carried and installed by at least two people.
• Do not touch the speaker units. Doing so may result in incorrect audio quality.
• Place the speakers at approximately the same distance from the listening position.
• The speakers produce bass sound from the bass reflex ports on the rear as well as from the front. Install the speakers at least 5 cm (2) away from the walls so that they do not cover the bass reflex ports on the rear.
• Keep the amplifier or any other device and the speakers at least 1 cm (¹³/32) away from each other.

For optimum position

The quality and volume of the bass sound, sound localisation performance, sound ambience, and other factors that determine the audio quality vary depending on the installation location of this unit, listening position, room conditions, and other factors. Refer to the information below when installing the speakers.

Determining an installation location.

• Each speaker has a mass of approximately 32 kg (71 lbs). Check that the installation location is strong enough to bear this mass.
• If you need to secure the speakers against tipping over, consult an installation specialist. The strength of the floor and wall must be verified.
• Put the speakers on a flat safe surface. If the speakers wobble when placed, use the spacers.
• To minimise the gap in audio quality between the left and right speakers, install them so that acoustic conditions (reflection and absorption of sound) around them are the same.

Adjusting the distances between the rear of the speakers and the walls
If you install the speakers close to a wall or in a corner, the bass sound will be more powerful; however, when the speakers are too close to it, sound localisation performance and sound ambience may deteriorate. If this occurs, adjust the distance between the speakers and the front wall, which should be between 30 cm (12) to 60 cm (24). (Please note that the distance between the speakers and the side walls should be greater than 60 cm (24).)

• Do not drag the speakers by force. Doing so may damage the speaker and the floor.

Adjusting the angle of the speakers
Angle the front side of the speakers toward the listener. Following these steps will help the speakers deliver more precise sound localisation.

Adjusting the acoustics of the room and speaker layout
Depending on the room environment (including the size and shape of the room, distance to the walls and reverberation level), certain sounds may be exaggerated or suppressed, making them difficult to hear. In such cases, adjusting the reverberation level by moving the speakers, changing your listening position or covering the walls and windows with thick curtains may help resolve the problem.

• The spikes may enhance the audio quality.

Attaching the base plates

1. Remove the accessories.

• Remove the accessories from the styrofoam blocks, and place them in a location away from children.
  

2. Place the styrofoam blocks in an area suitable for work.
3. Remove the packaging box of the speaker net. Leave the cardboard in place to protect the speaker unit.
   
4. Place the speaker on the styrofoam blocks removed in Step ②.

• Keep the following points in mind when lifting up the speaker.
  • Hold the bottom so that your hands do not slip.
    

5. Roll up the protective bags (2 pcs) to uncover the bottom of the speaker.
   
6. Attach the base plates (4 pcs) to the speaker securely with the supplied screws.

Placing the speaker using the rubber foot
Attach the rubber feet (4 pcs) to the recesses on the base plates in advance.

• Peel off the backing paper from the rubber feet, and push them firmly into the base plates without touching the adhesive surface of the rubber feet.
  

• Loosely pre-mount the three screws with your hands first, and then tighten them with a screwdriver.
  

• After attaching the base plates, ensure that they do not wobble.

Placing the speakers using the spikes

The spikes may enhance the audio quality.

To avoid floor damage, have two thick mats (or similar) available. Place them in the unpacking location and the installation location in advance.

1. Place the speaker vertically on a thick mat (or similar).
   
2. Remove the protective bags (2 pcs) and the cardboard covering the speaker.
3. Carry the speaker to the installation location while tilting it forward, and place it on a thick mat (or similar).
   

6. In the same way as Step ④, tilt the speaker backwards and remove the thick mat (or similar).
7. Screw the spikes into the two front-side base plates. When using the spike shoes, place them under the spikes.
8. If the speakers wobble, place the spacers under the spike shoes.
   

Placing the speakers using the rubber feet

Attach the rubber feet (4 pcs) to the recesses on the base plates in advance.

To avoid floor damage, have a thick mat (or similar) available. Place it in the unpacking location in advance.

1. Place the speaker vertically on a thick mat (or similar).
   
2. Remove the protective bags (2 pcs) and the cardboard covering the speaker.
3. Hold the speaker so that it is tilted forward and move it to the installation location.
   
4. If the speakers wobble after being placed, place the spacers under the rubber feet. This will prevent the rubber feet from wobbling on the installation surface.
   
   

Preventing the speakers from tipping over

The speakers may tip over in a disaster such as a powerful earthquake or in an accident. For your safety, be sure to secure the speakers against tipping over.

Each speaker weighs approximately 32 kg (71 lbs) in total. Verify that the speaker locations are strong enough to withstand this weight.

For details, consult an installation specialist.

• When securing the speakers to a horizontal surface (floor, etc.)
  Secure each speaker to the floor with wires or similar items as shown in the illustration.
  

• When securing the speakers to a vertical suface (wall, etc.)
  Loop a band or similar item around each speaker, and connect it to a sturdy wall or column with a stout wire, chain or similar item, as shown in the illustration.
  

• The measures described above do not guarantee protection against all disasters and accidents, including earthquakes. Please note that Panasonic is not responsible for any damage to the speakers, their installation locations or other objects caused by the work performed to secure the speakers from tipping over.
• Use of the spikes will make the speakers more vulnerable to tipping over.

Connections

Connecting the speaker cables

The speakers are not supplied with speaker cables. For connection, use commercially-available speaker cables.

1. Turn the knobs to loosen them, and insert the core wires into the holes.
2. Tighten the knobs.

If it is difficult to connect the speaker cables, remove the knobs before connecting them.

• Be careful not to cross (short-circuit) or reverse the polarity of the speaker wires as doing so may damage the amplifier.
  

Connecting with an amplifier

• Before connection, turn off the amplifier and disconnect its power cord.
• For details, refer to the operating instructions of the amplifier.

Connect the amplifier and speakers with speaker cables (commercially-available)

• Do not move the speaker while the speaker cables are connected. This may cause a short circuit.
• When the connections are completed, pull the speaker cables lightly to check that they are connected firmly.
• Wire the polarity (+/-) of the terminals correctly. Not doing so may adversely affect stereo effects or cause malfunction.

Attaching the speaker nets

The speakers are supplied with speaker nets, which protect the speaker units from dust. Use the magnets to fix the speaker nets to the speaker units.

• You can enjoy superior quality audio by removing the speaker nets before playback.

Notes on use

To protect the speakers from damage caused by excessive input, observe the following precautions:

• Reduce the volume in the following cases to avoid damage:
  • When playing distorted sound.
  • When the speakers are receiving howling from a microphone or record player, noise from FM broadcasts, or continuous signals from an oscillator, test disc, or electronic instrument.
  • When adjusting the sound quality.
  • When turning the amplifier on or off.
• Avoid raising the volume level too much when enhancing the treble sound with a graphic equalizer or any other controls.
• Avoid outputting excessively loud sound with a small power amplifier. Doing so will increase the amplifer's harmonic distortion and may damage the speakers.
• You can damage your speakers and shorten their useful life if you play sound at high levels over extended periods.
• Do not touch the speaker terminals with your hands or other objects while the speakers are in use. Depending on the conditions of use, doing so may expose you to high voltage.

Unit care

Wipe the speakers with the supplied cleaning cloth.

• When dirt is heavy, wring a wet cloth tightly to wipe the dirt, and then wipe it with a dry cloth.
• Do not use solvents including benzine, thinner, alcohol, kitchen detergent, a chemical wiper, etc. This might cause the exterior case to be deformed or the coating to come off.

Specifications

Type	3-way 4 speakers, bass-reflex type (coaxial 2-way midrange/built-in tweeters)
Speaker unit
Woofer	16 cm (6 1 / 2) cone type x2
Midrange/Tweeter	Coaxial 16 cm (6 1/2) cone type k1 / 2.5 cm (1) dome type x1
Impedance	4
Input power (IEC)	200 W (MAX) 100 W (RATED)
Sound pressure level	88 dB (2.83 V/m) 85 dB (W/m)
Frequency range	27 Hz to 100 kHz (-16 dB) 32 Hz to 85 kHz (-10 dB)
Crossover frequency	480 Hz, 3.2 kHz
Dimensions (WkHkD)
With the spikes	302 mm x1,114 mm x375 mm (11 7/8x43 27/32x14 3/4)
With the rubber feet	302 mm x1,093 mm x375 mm (11 7/8x43 1/32x14 3/4)
Mass (Weight)	Approx. 32 kg (71 lbs)
Operating temperature range	0 oC to +40 oC +32 oF to+104 oF)
Operating humidity range	20% to 80% RH (no condensation)

• Specifications are subject to change without notice.
• Mass and dimensions are approximate.