Convertible Speaker locations

I did a test of my idea to see what kind of sound I would get out of speakers down behind the convertible side panels.

I used a pair of PC speakers (Harmon Kardon HK109 that came with a Dell PC I bought back in the 90's) connected to my daughters iPod. I had them playing and then I gradually covered them up, first with the side panels and then by installing the seats amd finally the armrest pads. As I added more stuff, I could tell that the high frequencies were getting weaker and I heard more of the bass. I used the iPod's equalizer to reduce the bass and it helped quite a bit.

I was surprised at how good they sounded, especially when I sat in the back seat. My ear was right above where the sound was coming out and I could hear everything really well. They sounded pretty good from the front seat as well. And that's without any other speakers in the car.

I think it may have sounded a tiny bit better with the top up. I was afraid having the top folded down would obstruct the sound, but it really didn't make that much difference.

Based on this test, I really don't think I need two speakers on each side. I think just one 5-1/4 on each side will be fine. That eliminates the need for the 4 channel amp.

I also think using a component set and mounting the tweeter in the recess above the armrest will be worth it for the high frequencies. If somebody were really opposed to cutting the side panels, I think they could get by with a coax speaker down below and boost the trebble. But my side panels have already been repaired so it's not like I'm cutting a virgin set of panels.

These are the speakers I plan to use: http://www.alpine-usa.com/product/view/spr-50c. The tweeters are less the 2" in diameter and I think they will look pretty subtle up in that recess above the armrest.

Here are a couple pictures in case it's not clear what I did for this test.