I just installed a bluetooth screen head unit. Everything is wired up correctly but no sound from the speakers.
The car came with the Bose system and it's a 93 FD. Is there anything I missed when installing the head unit? Thanks

 

The speakers have internal amps that would need to be bypassed since the Bose head unit is a preamp only. Or better yet run fresh wires to new door/rear speakers. Just do a quick search and you will have all the info you need.

 

^if he hooked up his wires to the amplifiers it should still produce sound though. Over powered sound that is ****, but sound none-the-less (I've done this before so I know how crappy it sounds). Something else is going on. Maybe he missed the sense line? Which won't matter if he bypasses the amplifiers altogether, like you said.

IMO the real problem is that Bose works on a 1ohm system while regular headunits run on 75ohm. What that translates to is degraded sound quality due to the mismatch of impedances. So it ends up being worst quality than your average stereo. As for me, after contacting BOSE they provide me with their schematic showing impedances (talk about service) and I fixed my issue with an impedance transformer in conjunction with an attenuator, but honestly it wasn't worth it.

The OP is better off replacing the bose speakers with regular speakers. At least that's what I did, because at the end of the day my regular headunit with Bose speakers was just 'okay.'

 

thnx guys! I bought some pioneer speakers so ill try it tonight