audio problems on 4 slot board

Ok, I was wondering if anybody can help me here. I installed a japanese 4 slot board on my candy cabinet and the audio/music sounded incomplete (bass was way too loud) and some sound effects were almost muted. On the sound test screen, when you play "right" and "left", I hear moderately loud beeps from the right speaker but hardly anything from the left. When I play "center", I hear a very quiet, almost muted beep from the right speaker and nothing from the left. Is this problem coming from the motherboard or from the cabinet/speakers? And is this fixible? When I play other jamma pcbs on this cabinet such as CPS2 games, the audio sounds perfectly fine so I dont know whats going on here. Any help or reply would be greatly apreciated.

Hey there,

I too have a Super Neo 29 Candy cab which I got from www.Arcade-infinity.com. I found that it was wired for mono with pin 10 going to right speaker positive w/ negative were cut from the molex connecter. They spliced & soldered the negative to the pin 10 wire. Pin L going to left speaker positive w/ the negative wired the same.
Ok, all you have to do is clip the negative and reconnect it to ground from the molex connector if your cabinet is wired the same. You can get fancy and solder or put on quick disconnects or you can just twist it on and wrap it with electricians tape.
For now, I used quick disconnects so I can switch it from mono to stereo when I want to play mono JAMMA PCB's. Soon, I'm going to wire in a Stereo mono switch that Dasfool made. Going to mount it on the back of the cabinet by the speakers.

http://dasfool.aroo.tv/SimplePlusSound.htm

Side note, your going to have to make some kind of jumper for the test switch as well for the 4 slot. In JAMMA, the test switch is located on pin 15, Neo Geo MVS is located on pin M. I just jerry rigged a wire that goes between 15 & M and it works ok until I can get a split pin to fit in there. I'm not sure if it will affect a JAMMA PCB if I leave it hard wired, so for shits & giggles I'm just going to wire in a on/off switch. Other then wiring in the select button & grounding it, thats pretty much all you have to do.

I hope this helps out a bit, if needed, I can email you a picture of what I did. It only took me around 20 mins. I would have done it much faster but my to little monsters were getting in the way trying to help me out .

Hi there,
Thanks for the reply. Sure I'll have pics of what you did. You can just post on the pages here.