What type of interface is on the HK door speaker? How does it differ from the tweet and kickpanel speaker? All you have to do is make a solid connection from the speaker lead to the pos. and neg. side of the speaker. There is no reason to have to use any factory clip other than for ease of installation.
As far as crossover, the oem three way should work fine. All the crossover does is divy up the proper frequency to each of the speakers. Tweet cant make bass...the crossover only sends out highs to the tweet. The midbass/kickpanel speaker cant reproduce high frequencies.....so the crossover sends only mid-frequencies to it. Seeing as though the HK and Nokia speaker systems use the same size (diameter) speakers, the crossover should be universal.
As for how BMW wired it, Im not positive. A standard aftermarket three-way component system just has a box (crossover) and has one input (from the amp) and three outputs. The crossover then balances impedence so the amp only sees one 4ohm load and thinks its driving one speaker and not three.
Actually now that i look at it, I believe the crossover for the oem speaker system is located inside the oem amp. Looking at the pin connection chart, it seems as though there is a lead for each driver.
This makes me curious. You replaced the oem amp, correct? How did you wire your speaker leads there Furious? According to the chart below, once you removed your oem amp you would have essentially ten speaker leads, and I have never seen a ten channel Pioneer amp with seperate crossover controls for each pair?
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