I emailed Jim at Rottendog, but didn't get a response so I guess I'll post here about this.
But I have a Guns N Roses with a new rottendog power supply board. I installed updated speakers into the machine. The sub I installed requires more power to drive it which requires turning the vol knob up higher. When I do this, the machine sound starts cutting out. It's much worse when multiball starts or a lot is happening on the machine.
I tracked this down to the unregulated 12vdc being a bit weak to the audio board. When I traced this back, it did wire correctly to CN6 pin 6 labelled +12VU. But that meters around 11.5v for me. When I meter the test point labelled +12VU, it meters around 14.5v. The test point C15 which is 12v *regulated* meters 11.5v. When sound is going crazy, the voltage drops down to under 6v. Metering test point C15, the regulated 12v shows the same drop as at the sound board. It appears to me that the rottendog board has reversed the regulated vs unregulated 12v.
I thought maybe my board was defective, so I bought another. It's the same way. I consider this a major flaw with the board design. It may be ok for some cases but over taxing the regulated circuit has negative effects as seen here. This is something i think i can fix by cutting traces and running jumpers so that the correct circuits attach to the correct pins. It seems the 12vdc regulated only powers the dmd on this board.
By the way, putting in a regular data east power board does solve the audio problem and everything runs fine.