Quoted from Rdoyle1978:

You should check the impedance on the speakers. PinSound can run 4ohm and 8ohm speakers and you should make sure the speakers are matched to the cabinet speaker, which should be 8ohm. The backbox speakers should be 4ohm
Anyway make —sure— you are using the original wiring from the TZ. Try to match the pos and neg connections to the drivers. I believe the pos is the black/yellow wire and neg is the black. The original wiring is in series and the PinSound speakers are hooked up in parallel, so make sure the TZ has the original wiring
Why are you doing this anyway? You won’t get much out of the PinSound speakers in a WPC89 game without a PinSound board.
If you are wanting to increase the bass from the cabinet speaker, you’ll also need to add an L-Pad and crossover in order to crank the bass. Or buy Flipper fidelity speakers. But I’d just get a PinSound.