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The doors will hold a mid and a 10 inch woofer mine are Dynaudio 182 which are both pricey an fit. A tweeter will fit in the sail and a 6 channel amp like a JL Audio will fit out of sight in the trunk. That would make a basic system and sound quite a bit better. Above that in funds allow add a processor to better tune it. You can tap the wires off the stock amp in the trunk and will only have to run speaker wires for the tweeters ( unless you go with a co ax for mid and tweeter ) and a power wire for the amp. There are plenty of posts here for the wiring.
Thanks for the reply. Which Dynaudio drivers did you select? Does anyone have thoughts on not using the sail tweeter at all and instead going with either a co-ax in the upper door position (tweet/mid) or a simple two way system?