Knoll systems ma 205 owners manual
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Page 1
Installation Installing the MA205 should be relatively easy. With a bit of planning, the MA205 will give trouble free service for years. 1. The most important consideration when installing the MA205 is cooling. 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 adequate convection cooling. 2. When installing the MA205 in a rack we suggest adding a 3-1/2" blank above and below the MA205. In multiple MA205 installations, plan for a 3-1/2" blank (double) between each MA205 and a 3-1/2" blank on the top and bottom. Amplifiers should always be the top components in a rack system. 3. If MA205 channels frequently shut down due to overheating, install a fan directed up from the MA205 bottom center. 4. Never operate the MA205 on its side, as the cooling potential drops significantly when operated on the side. 5. Connect the MA205 inputs to the source component outputs with good quality, short as possible RCA jack cables. 6. Connect the MA205 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). Note: Ideally the MA205 is operated into 4-8 ohm speaker loads. The MA205 will not operate into 2 ohm loads. Do not attempt to mono bridge the MA205 7. 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. 8. If connecting the MA205 to the whole house sound system, connect the whole house amplifier outputs to the MA205 speaker terminals labeled "AMP INPUTS" using good quality speaker wire. 9. If you are planning to use a video signal to trigger the MA205 power on and off, connect a good quality video wire with an RCA jack to the MA205 input labeled "Video Input". Make sure the music sense button is in the "OUT" position. 10. If the music sense or video input is being used to turn the MA205 power on and off, switch the music sense button to the "OUT" position. Adjust the "Sens" itivity pot on the MA205 so the amp turns on when quieter passages are playing via the RCA line level inputs. Adjust the "Delay" pot so the amp turns off a reasonable time after the music has stopped. 3 installation continued... 11. To use the 12VDC trigger to turn the MA205 on/off, connect the trigger to the 3.5mm trigger jack. Set the music sense switch to "IN". The front panel power switch is normally off (out position). 12. Individually adjust the channel gains as required. For best noise and hum cancellation, all MR205 gains should be on full (fully cw). MA205 2 Channel Power Amplifier Inputs:Gold RCA style with adjustable gain Input impedance: 20 k ohms Outputs:Gold 5 way Binding posts Output power: 50 watts RMS per channel (8 ohms) Peak output power: 70 watts RMS per channel (4 ohms) Ideal impedance: 4-8 ohm speakers Freq. response: 10 Hz - 40 kHz +/- 1 dB (1w) S/N ratio: over 95 dB A weighted 50 watts THD distortion: <0.1% 20 Hz to 20 kHz IMD distortion <0.01% 60 Hz 7 kHz 4:1 (SMPTE) Trigger control: 12 VDC 35mA (3.5mm input jack) Power:140 watts 117 VAC Dimensions:8.5" x 3.5" x 10.5" Weight: 8 lbs (3.6 kg) Caution: Never listen to sound that is distorted. If distorted sound is heard, turn the volume down immediately or speaker and/or amplifier damage could occur that is not covered by the warranty. If this problem persists, contact your dealer. User Adjustments and Service: There are no user adjustments on the MA205. Your installer may make certain level and delay adjustments on the rear panel. Caution: The MA205 contains no user serviceable parts, so do not attempt to open or repair the MA205. Refer servicing to a qualified technician only or contact the factory for information. 4
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5 Troubleshooting If a problem is encountered with the MA205, 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 controllers, CD players, volume controls, wiring, speakers, etc. that may be at fault. ProblemAction Power indicator does 1. Check that the MA205 is plugged in. not light - no sound 2. Test the AC outlet with a lamp. 3. Confirm the MA205 front power button is on Sound cuts out 1. Verify speaker impedance is 4-16 ohms. Changing speakers may be required. 2. Check if the MA205 feels hot. If it's hot, increase cooling - see Installation. 3. If music sense is selected on the rear, the music may level may be too low to activate and hold the amp on. Turn the source volume up and the MA205 gain controls down to compensate. Connect a 12 VDC trigger (trigger mode) or contact the Knöll factory for information on defeating the music sense mode. 4. In music or video sense mode, the MA205 rear delay time may have to be increased. Sound is distorted 1. Turn the volume down 2. Check speakers for damage. 3. Check inputs for proper levels. MA205 gain and the music source output levels may have to be adjusted. 4. Speakers may have less than 4 ohm rating and may need to be changed. MA205 does not 1. In trigger mode, make sure trigger power is automatically turn off turning off by removing trigger plug on rear. Make sure front panel power switch is OUT. 2. In music sense mode turn off source music components. If the MA205 doesn't turn off after about 2 minutes remove RCA input plugs. If the MA205 turns off, reconnect the RCA plugs and try adjusting the sensitivity down. In Canada: 11791 Machrina Way #120 Richmond, B.C. V7A 4V3 Knöll Systems tel (604) 272-4555 fax (604) 272-5595Knöll Systems, Richmond, BC & Point Roberts WA C COPYRIGHT 1998-2003, Knöll Systems, All Rights Reserved In America: 145 Tyee Drive Point Roberts, WA 98281 Limited Warranty Knöll Systems warrants MA205 amplifiers sold in the USA or Canada by authorized Knöll dealers to be free from defects in materials and workmanship. This warranty extends for three full years from the date of purchase by the consumer. Any products returned freight prepaid to Knöll Systems and found to be defective by Knöll Systems within the warranty period will be repaired or replaced at Knöll Systems option, at no charge. Knöll Systems will not be responsible for the actual cost of installation or removal of the product, nor for any consequential or incidental damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights. You may have additional rights which vary from state to state. Knöll products sold outside of the USA and Canada may be covered by warranties provided by an authorized Knöll distributor. Please contact the distributor in the country that the Knöll product was purchased. * DMS, Powermatch, Transformer free and Digicom are trademarks of Knöll Systems Printed in Canada