jdunk54nl

I don't know of very much car audio that uses balanced inputs, RCA's can't do balanced because they only have two signal paths and we would need three for balanced as you stated; +, -, ground. So XLR or TRS style cabling.

I also still do not get how the voltage through low level isn't accurate if you say the high level is, that same signal either feeds the internal amp on the ACM or the external amp. So if the low level isn't an accurate voltage than the high level isn't accurate either if it is being fed by an inaccurate signal. Multiplying the voltage (high level) would just make the inaccuracy even worse.

But just for giggles I switched my ACM back to highlevel tonight (unplugged everything at the DSP so I didn't break anything), and tested it. It acted the same as I previously described. Front level did not increase with fade forward but rear decreased. Vice versa when fade to the back. This was with a 40hz test tone playing so I could get decently consistent voltages.



Maybe when the factory radio is playing music and you fade, it is more efficient when it only has to feed two channels and isn't being maxed out with a test tone (although I did try this at about 25%, 50%, and 100% volume so the first two shouldn't have maxed it out). But obviously music would be way too hard to actually measure this.

maroonandwhite

That was my initial thought. Don’t really ever see that in the audio world to my knowledge but I can’t tbink of another explanation other than it actually being boosted. Your findings don’t mirror that though. Very weird.

The radios did change from 2012 on though didn’t they?