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I have another question for those that can maybe help. Got my high and mid stage set on a 4x100 channel. Got the undistorted reading from the amp gain about 1/3 turn) at full volume from the head unit(also previously checked for no distortion) . I wanted to turn down the amp sensitivity slightly to match the ac volts / watts for my components. However, the voltage is way over what it should be for the channels. Everything is turned to zero on the HU to get flat signal. For example : used zero db 1k signal test and the voltage is way more then the amp says it produces. Trying to get to about 14.1 volts and the no distortion level is like 24 +-1 volts.    Why is this?  If a no distortion level on a 100 watt channel is registering 130 to 150 watts. Amp is jl xd400

bottom line: do I go by dd1 or voltometer to adjust for a lower ohm load? Does the dd1 account for when you hook up lower impedance?

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DD-1 doesnt care about the load you present the amp, it only measures distortion in the signal. A lower resistant load will not cause distortion. If you are concerned with overpowering, then either exercise volume control or dial the gain back some

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Dd-1 is to match preamp voltage from deck at 1% thd to the amp... ohm load is irrelevant... use the 0db track for your mids and highs amp and you should be fine with the extra watts for headroom the amp doesn’t produce that on music all the time anyways 

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