MX5Ireland

Did the headrest wire fix last night, wired them up in parallel (they were indeed the wrong way round). Going to check out the phase in all of them this weekend, easy lookin' job for big results (apparently). The sound improvement just by doing the quick fix last night is fab, the headrest speakers are now almost as loud as the door speakers.
Here are the wiring diagrams

To test for phase polarity :
You get the wiring diagram, two wee jumper wires and an AA battery.
Put positive on batt to speaker positive + just touch neg to neg (just a touch), if speaker cone comes outward , phase is correct, if it goes inward, swop the wires round at the speaker.
The wiring diagram is up on that diagram site I think in one of the PDFs
So, ya need to do the door speakers too to really get the full effect.

I just swapped out my speakers for a couple of bigger ones and cut the foam. Can barely hear the door speakers over them haha