[quote author=geewhizbang link=topic=67517.msg1167890#msg1167890 date=1169697839]
75 watts RMS should be more than adequate. I highly recommend just replacing the fronts, because it sounds better that way. Rear speakers are a lingering artifact from the past.
Make sure you get a acousticmat kit and deaden the doors as much as you can, because the door panels are extremely reverberant. This would be noticeable even with the lousy OEM drivers, so it would be even better yet with your new speakers.
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75 watts isn't going to be enough to drive these comps optimally. Like I said above, these comps like a lot of power. Sure 75 will work, but if you could find an amp with a little more power, you'll really be happy.
Oh and as far as using a 4 channel amp, if you want to bi-amp those comps you CAN do it. So a 4 channel would work. But in most cases people will choose to go competely active (no passive crossovers at all) if they are going to go with that type of setup.
According to JL Audio's recommended power chart, 400 watts rms would be perfect for the 10W6v2.