Knoll systems gs 12 owners manual

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8. Make sure the speakers in each room are connected in phase with the amplifier + going to the speaker +. Out of phase speakers give unstable imaging and poor bass response. 9. Connect the AC power into an outlet than can supply at least six amps (750 watts) dedicated to each GS8 or GS12. 10. After the amp has been turned on adjust the SENS pot on the rear of the amplifier if necessary. The SENS adjustment can be adjusted up (clockwise) to make th e amp less susceptible to be turned on due to nuisance noise and hum. If it is adjusted too high, the amp may delay turn on or turn off duri ng a quiet music or speech passage. Caution: Never listen to sound that is distorted. If distorted sound is heard, turn the volume down immedi ately or speaker and/or amplifier damage could occur that is not co vered by the warranty. If this problem persists, contact your dealer. User Adjustments and Service: There are no user adjustments inside the GS8 or GS12. Your inst aller may make certain gain and sensitivity level adjustment s on the rear panel. Caution: The GS8 or GS12 contains no user serviceable parts, so do not attempt to open or repair the GS8 or GS12. Refer servicing to a qualified techni cian only or contact the factory for information. Troubleshooting If a problem is encountered with the GS8 or GS12 amplifier, the most expedient procedure is to locate the problem and if possible repair it before requesting service. Be sure to carefully check other system components such as controlle rs, CD players, volume controls, wiring, speakers, etc. that may be at fault. Problem Action Power led does 1. Check that the GS8 or GS12 is plugged in. not light - no sound 2. Test the AC outlet with a lamp. 3. Check GS8 or GS12 power button on (in). 4. Slowly turn down the SENS adjustment (counterclockwise) on the amplifier rear, until the amplifier just turns on. Installation Installing the amplifier should be relatively easy. With a bit of planning, this amplifier will give trouble free service for years. 1. The most important considerat ion when installing the GS8 and/or GS12 is cooling. This amplifier has a lot of power packed into a small chassis size. When installing it in an equipment stack, it should be the top component. It needs at least 3"-5" of space above the amplifier to allow for adequa te convection cooling. 2. When installing the GS8 and/or GS 12 in a rack we suggest adding a 3-1/2" blank above and below the amplifier. In multiple GS8 and GS12 installations, plan for a 3- 1/2" blank (double) between each amplifier and a 3-1/2" blank on the top and bottom. Amplifiers should always be the top components in a rack system. 3. The GS8 and GS12 are available as an optional 19" EIA rack mount style. 4. Never operate a GS8 or GS12 on it s side, as the cooling potential drops significantly when operated on the side. 5. Connect the GS8 or GS12 RCA inputs to the source component outputs with good quality, short as possible RCA jack cables. Connect each channel individually. 6. Connect the GS8 or GS12 speaker outputs to speakers using good quality speaker wire. Minimum 16 gauge copper wire is recommended with 14 gauge minimum for runs over 30' (10m). Fire-rated wire may be required if installing wires in side walls, ceilings or floors. Note: Ideally the GS8 and GS12 amplifiers like 6-8 ohm loads. Connecting to 4-ohm loads won't hurt the amplifier, but the channels connected to 4-ohm loads may o ccasionally shutdown due to overloading. Never connect any GS8 or GS12 amplifier to less than 4 ohms. 7. Individually adjust the channel gain s as required. Ideally, all gains are fully on (fully clockwise).