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I have tried this same result. Explain how taking out my 2v preout hu and putting in a 4v preout hu that reads over 4v on a dmm how I wouldn't be getting 4 volts? lol. The RCAs come out the back of the HU and go into the amplifier. I also would like to put out there that I have used this DD1 to set the gain on many amps. Worked just fine. This is the only amp that acts like this I've seen. Since you asked. Just because you have a head unit rated for four volt on the pre outs doesn't mean It will actually have that. Some only do it with the sub out turned up all the way. Others don't. Some don't ever make four volt either. Some split the the pre out rating between all the channels. Some only make it on the sub out too. Hence the so many variables. But I didn't realize I was dealing with an expert and all. I guess it should have been obvious

There is zero chance that it won't register on a dd1 if done correctly

The actual magazine issue (of course) was out last year around October. It was 11 pages with a pullout poster of the Tahoe which i thought was pretty cool. They finally got the online version up. click this link for the full article http://www.fastcar.co.uk/cars/chevy-tahoe-audio-car/

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I havent seen this dyno on this board, but if they did a cert run, it looks for >1.0% distortion . Meaning, the dd1 software worked. Again, i havent seen this dyno test on this board. If they did a un cert run, it looks for clipping. Meaning again, the dd1 software did its job. IMHO, ...Your "people" you are "speaking with", are doing it wrong.