The wiring on multi-slot cabs is different from JAMMA cabs. Sometimes referred to as MVS. Notable differences are the rearrangement of service and test switches along with the replacement of balanced mono to stereo sound. Speaker impedance matching becomes an issue. Plugging in a 1-slot or any other JAMMA board in an MVS wired cab will fry the audio amp. Short story, 1-slots are not plug and play in multi-slot cab.
Is that the same for all 1 slots? I know there are a number of different ones and iirc only the MV1FZ is a straight plug and play in a jamma cab
I'm not certain you'd damage a 1-slot or JAMMA board in an MVS cab. I've seen an MV-1C board play fine in a 2-slot, and an MV-1F play fine in mono mode on a Neo Candy 29 wired in stereo. Having said that, it would be better to have something like the JNX v1.2 Big Red Adapter for optimal sound quality and compatibility. Check your cabinet's speaker wiring to be sure.