I have done several audio installs, but most involved only 4 speakers, and more specifically one speaker per channel. I have a question for those far more knowledgable in car audio than I. Would this scenario work:

Head unit: Alpine CDA-9835
Front Dash Speakers: Rainbow (4 ohm?)
Read Deck Speakers: Rainbow (4 ohm?)
Door Speakers: Some form of dual voice coil dedicated sub (4 ohm/coil)

Front left and right outputs go to the front dash speakers and one voice coil on each door sub via a passive crossover, effectively giving me a 2 ohm load on the front channels. Rear left and right outputs go to the rear deck speakers and the other voice coil on each door sub via another passive crossover, also giving me a 2 ohm load on the front channels.

I guess my main questions are:

1) What does a passive crossover do to resistance? Double it (i.e., running in series), half it (i.e., running in parallel), or does it stay the same? I want to say it effectively acts like running the speakers in parallel, but I'm not sure.

2) Is the V-Drive amp in the higher-end Alpines stable to 2 ohms?

3) Do the voice coils in a dual voice coil sub act as seperate "virtual" speakers, and can they be seperated onto two different channels as outlined above?

If the answer to the first question is what I am thinking, and the answer to the latter 2 is "yes", then I think this will work without the need for an external amp. If not, do I need an amp for the subs, or are there other solutions?

Thanks.

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J.B. Hebert

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Current Vehicles:
'76 Ford Bronco
'78 Volvo 262C Bertone V8
'80 Alpina B7 Turbo Coupe (For Sale)
'94 Ford Explorer
'95 Mercedes E300D Sportline+