Bridging L/R RCA channels to balance voltage output?

[WalledSonic]

I measured the voltage output at the sub RCA terminals on my head unit, 1.437 and 1.407 volts. I know its only 2% difference, but if you bridge the channels together, im wondering if the voltage value steadies out and balances, and if there are any negative effects. Is this a common practice if the channels are not perfectly balanced? I know some ppl use a DSP, but thats not the topic. 

EDIT: i have 2 amps, so i was going to use a channel per amp. With a mono amp, the signal is handled in the amp. 

EDIT EDIT: i guess it doesnt matter if both are set with a DD-1, huh

[reedal]

in your case, upon gain-matching the amps to matching outputs, it shouldn't matter unless the voltage on each side doesn't change at the same rate as music is played. But if equal RCA output from the HU is what you're looking for, it could be your HU settings. You have the 80PRS correct? there's a setting for mono/stereo sub-out in the audio settings menu, somewhere in the same area of adjusting the levels. Are you set to Stereo? Auto T/A done? I can't remember if you're able to adjust the L/R sub levels like you are mid and high, but that could be the reason for the difference you see.

 

Or I could be completely wrong about your HU/settings.

[WalledSonic]

Thanks for the input. Yes, its a PRS but its set to mono in the settings. Had trouble setting the SSF earlier after setting with the DD1. Used Damores -5dB track and set the amps at 70V. Then for SSF testing i used Got160s -4.5dB tracks (only ones i have on that drive). 40Hz track was giving me ~70V on both channels while the 23Hz track was giving me ~70V on L channel and 59V on the R channel. Gonna do full testing at the head unit tomorrow with a bunch of tones to see if my channels are even. If they arent even, i may just use the single good channel and split that to the amps. 

[reedal]

That's no good. was the 70/59v with the SSF all the way down on both amps? I'm sure it was, but I ask just for process of elimination purposes. I would say try swapping the left/right inputs to each amp, see if it follows the RCAs, or if it stays with the amp that originally output 59v. if it stays with the amp, it's the amp, but if it swaps, HU for sure.

 

Now you've got me curious if my RCA outputs are equal on mine...

[WalledSonic]

I'll be pulling the HU and testing in about an hour after I pick up some beer.  I will report back the findings.

[WalledSonic]

Alright, here's the voltage straight out the head unit with a Got160s -4.5dB test tone at:

40Hz

Left: 1.872

Right: 1.913

23Hz

Left: 1.872

Right: 1.912

About 2% off from each other.  Then I tested the voltage at the amps: 

40Hz

Left: 73.5V

Right: 69.5V, but I matched this one to 73.5V.

23Hz

Left: 72.5V

Right: 72.0V

This isnt the difference I was seeing last night, but thats good.  Maybe I had a wiggly connection somewhere.

Then I set my SSF to 52V at 23Hz, which is about 0.7 of the 73.5V reading at 40Hz.

So the 2% difference I guess doesnt really matter, but I think I'm going to leave the left channel unused out of the HU and split the right channel to the 2 amps so that I know the amps are always getting the same waveform.  Probably unnecessary, but it would be nice knowing the amps are seeing the exact same signal.