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1.There are amps out there which are 5 channell. Liek the New eD amp that came out, im not a fan of eD but it does look promising. You would use the 1st 2 channels for your frontstage then the next 2 channels for rear(if you want rear) and the 5th channel for a sub.
2. There isnt a lot of control going on from a carputer to the soundstage control aside from a soundcard upgrade. However, there are a few Sound Processors that can be controlled via computer. I know the RF 360.2 recently came out with a PC software to use instead of the PDA..via bluetooth. But the 360.2 lacks 4-way . Also the Alto Mobile Drive 30 sound processor/crossover has software to control it via Serial
3. Use a HU with an auxiliary input, u can switch from CD to Tuner to Aux. or if you do have a sound processor use its AUX(most usually have an extra 1 i believe) and have the HU as well.
4. Well this question can be answered by RedGTis signature...."The bitterness of poor quality remains long after the sweetness of low price is forgotten"
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