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4. Select a well recorded CD or Tape containing material recorded at a fairly high level. Musical content is not important except that the music chosen should be recorded such that any system distortion can be clearly heard, not masked by musical content. 5. Increase the source unit volume control about halfway. Increase the PowerPlate TM level control associated with the front full range (or midrange in a bi-amplified front system) until you can hear sound at a low but clear level. 6. While listening carefully for any signs of distortion, slowly increase the source unit volume cont rol until you either hear the first signs of distortion or you can’t turn it up any more. Back down on the volume control slightly until the distortion goes away. You have just found the maximum undist o rted output level of your source unit. Do not exceed the level in normal operation, as doing so will just send a distorted signal to the rest of the system. 7. Returning to the PowerPlateTM level control associated with the front main speakers, slowly increase it until you reach the point where distortion just begins to appear. This will be at the point where either the amplifier reaches its maximum output level, or the speakers reach their output limits. Either way, you have just calibrated the system so that the maximum system out put occurs at the same point as the maximum output from the source. This will give you minimum system noise yet the system will reach its maximum output capability. 8. Reduce the source unit volume to a comfortable listening level. With the balance and fader controls still centered, adjust the remaining level controls for the proper system balance. If you are adjusting a system with multiple amplifiers, it is easiest to adjust the controls in the following order: 1. Front speakers 2. Rear speakers 3. Subwoofers 9. If using an AC502 remote level control, adjust the subwoofer level with the AC502 in the mid position. This will give you the ability to boost the subwoofer level approximately 6dB when the AC502 is turned fully clockwise. 10. Double check your system levels by increasing the source unit volume control to the previous ly determined maximum position. If you hear distortion from any of the channels, reduce the PowerPlateTM input level for those channels until the distortion goes away. Adjusting the input levels in this way will get maximum undistorted output from your system and will make it unlikely that you will cause damage to any of the components of your system by overpowering them. System 3 – P650 used in 3-channel mode. Channels 1/2 and 3/4 are high-passed and bridged for front speakers. Channels 5/6 are low-passed and bridged for a single subwoofer. P850 system diagrams Using the AC502 (optional) System 1 – P850 used in 6-channel mode. Channels 1/2 are high-passed for front speakers channels 3/4 are high-passed for rear speakers, and channels 5/6 and 7/8 are bridged low-pass for sub- woofers. Although shown with 4-channels of input, the source unit can be either 2- or 4-channel. System 2 – The P850 is used in 8-channel mode. Channels 1/2 are high-passed for front tweeters. Channels 3/4 are band-passed for front midrange. Channels 5/6 are high-passed for rear speakers, and channels 7/8 are low-passed for subwoofers. Although shown as a 4-channel input, the source unit can be either 2- or 4-channel. The AC502 remote level control, available as an accessory from your a/d/s/ dealer, may be used with your PowerPlate™ to remotely adjust the level of your subwoofer. On the P450, the AC502 will control the level of the low-pass output of the 3/4 crossover. If the 1/2 crossover switch is in the 3/4 position the 1/2 level will also be controlled. You can use P450 as a bridged two channel subwooofer amplifier this way. On the P650 the AC502 will control the level of the low-pass output of the 5/6 crossover. On the P850 the AC502 will control the level of the low-pass output of the 7/8 crossover. To use this feature, simply connect the AC502 into the DIN connector on the Powerplate and install the AC502 in the desired location. Refer to the "adjustments" section for information on setting up the AC502 for the appr...

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