Folks, check out the JAMMAizer!
https://www.youtube.com/embed/ln19q_O7YXkIt is an adapter that allows consoles to connect to a JAMMA standard arcade cabinet. You can also use it to connect MAME to a JAMMA cabinet. The J-Pac has long since been the go-to-standard for MAME application. But as you all know, the J-Pac does not have an onboard audio amp. This necessitates some rewiring which often makes your cab no longer compatible with your arcade PCB's. This remedies the J-Pac's chief flaw.
Here is the
thread where development of the JAMMAizer was discussed. Check it out!