Knoll systems gs 8 owners manual
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Page 1
The eco-friendly choice The Knoll GS8 and GS12 are class A/B amplifiers that produce 50 watts per channel at 8 ohms and 70 watts per channel at 4 ohms. While offering unparalleled reliability, power and sound quality the GS8 and GS12 offers a Knoll exclusive, the Eco-Drive™ circuit. This patent pending circuit determines wh ich of the 12 stereo channels (6 pairs) are in use and delivers power only to those channels needing it. The channels that are off are truly off, not in standby or mute. With this circuit the active channels share more rail voltage resulting in more reserve power for the stereo channels in use. The most important feature of the Eco-Drive™ circuit is the electrical savings that is delivered to the owner over what a comparable class A/B amplifier will cost to operate. The typical homeowner will see a savings of a hund red dollars or more per year in actual electrical costs and that ca n be multiplied when taking into account the increased costs of air conditioning the home to extract unwanted heat produced by a typica l multi-channel amplifier. The GS8 and GS12 also feature a very quiet energy saving thermostatically controlled fan. A comparable amplifier without the Eco-Drive™ circuit (we should know, we make lo ts of them) uses about 14 times (65 watts) as much power while idling in standby. By comparison the GS12 with Eco-Drive™ uses under 5 watts while idling! For over 10 years Knoll multi-channe l amplifiers have sold around the world because of their legendary reliability and unparalleled sound quality. The GS8 and GS12 take the next logical step by being eco- friendly. Please consider the envi ronment when choosing your next system. Sound cuts out 1. Verify spea ker impedance is 4-16 ohms. Changing speakers may be required. 2. Check if the amp feels hot. If it's hot, increase cooling - see Installation. Sound is distorted 1. Turn the volume down. 2. Check speakers for damage. 3. Check inputs for proper levels. GS8 or GS12 ga in and source output level may have to be adjusted. 4. Speakers may be less than 4 ohms. GS8 or GS12 does not 1. Turn GS8 or GS12 power switch off (out). turn off 2. With the power switch on, and all input channels music source turned on, very slowly adjust SENS on rear of amplifier in a clockwise direction until amp turns off. Speaker pops when 1. Speaker may need resistor placed amp turned on or off across terminal. Suggest 2k0 1/4 w. This discharges the speaker internal cap.
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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).