Having the same problem of music cutting out during gameplay on GNR. Running a rottendog power supply that Markmon modified for me to fix the 12 volt loss issue. Have to check voltages again. Problem happens when volume turned up. Sound is not much better than stock so something is wrong for sure. Running an old pinball pro speaker kit. I had to modify backbox speaker when installing speaker light kit. Maybe a speaker cone got torn. This sucks.