Yep, very tinny. And I thought about removing the stock tweeters but I wasn't sure how much it was affecting things. I managed to pull out the JL's and put the larger MB's in the driver's door. I had one bad connection coming from the head unit and fixed that. I haven't put the second pair of MB's into the rears yet, too much of a PITA to do it after work on a Friday

Once I did that, I rewired everything into the amp as a normal 4-way setup without the sub. Big improvement. Still a bit too much upper midrange but an improvement none the less. I just wired the sub inline with the fronts and didn't use a filter since the fronts can produce a wider range of sound than the smaller JL's in the rear. Using a high pass filter on those. The 8" is putting out decent bass now but doesn't rock my world.

What do you guys think? Two 8"? I was actually thinking one 12" and psycho was thinking a 10", possibly two. I feel like the one 12" will be a bit less expensive and I can get a dedicated bass amp that way too. I also think I'm just going to remove the rear seats as I carry lots of equipment back there anyway and the area behind the seats barely cuts it.

I did a bit of searching and I didn't find too many 4 channel amps that put out decent power and looked like they'd fit under the seat. The mono amps in the 400W range don't seem all that large however.