Regarding my experience with RD I had a similar Sound issue using RottenDog power supply in my DE Simpsons when I un hooked the back box speakers it went away (of course these were stock speakers). Believe it or not the sound was good enough thru the cabinet speaker . I eventually repaired the OEM board and tucked away the rottendog as a spare and never pursued the issue any further. Last spring my flipper board went out on my GNR right before a family reunion and I didn't have time to fix it so I ordered a RD replacement and had it overnighted ... it worked about a week and started blowing fuses. Contacted Jim at Rottendog and he asked me to send him the board. I got it back a couple weeks later and he had repaired the issue no questions asked. So my customer service experience with them has been good. I went ahead and fixed the OEM flipper board but I switched them out for about a month and had no issues ,,,, again tucked the RD board away as a spare just in case