okay i set my gain today. i unplugged sub from amp. turned all settings to 0 and flat eq. gain and bass boost off i burned a cd with a 50hz tone and played it with a dmm on one of the amp's channels.
anyways with the gain turned up all the way i couldn't get the 35.8 volts i was looking for (320 @ 4ohm) it only got up to 28 or so
the only way i got it to go 35.8 was with gain about halfway up and bass boost up. whats up with this?
I had the same problem. I still can't figure out where it measure preamp rca voltage though. How did you measure that 5v or did you just go by what the manufacturer says?
I just had to settle for what I thought sounded good and still gave me a high voltage output. I'm still getting about half what I should. I do think that maybe just overrating though. I can't even get the right voltage with bass boost all the way up.
Measure your preout voltage. If you did and it says 5V, then I truly don't know what your problem is. You should of reached that 38V reading fast. Make sure your measuring it in AC as well.