Well, just thought that I'd pass along anugget of information on what I found. For those of you considering speaker replacements for your car doors like mine an 88 vert and want to do it on the cheap, as improbable as it may sound I found these shallow depth speakers, the Pioneer TS-163P 6 1/2" @ my local Wal-Mart. Yes, Diamond audio 651($300+) & S600($$$) will fit as well as Infinitys ect but for $30 these speakers do well. There's bass, and mids. Here are the specks right off the box:
Max 100
Nominal 20w
Impediance 4ohm
Sensitivity 92db/W (1M)
Freq resp. 40-20,0000Mhz

I got them in last night and the screw holes align perfectly with the doors. And looking at the original ones that I had on the shelf I'd swear they were the EXACT same as the stock ones purchased when the car was new. I've pumped them up on my Pioneer deck to volume 26 and you can feel the kick of bass hiting you. All in all not bad for $30. Actually, if I didn't tell you you wouldn't know they were $30 speakers..Hehe..With the Kappa perfects 4.5" running the dash to cover the highs which there really good at the sound is pretty good. Now to install the 3.5" eclipse headrest speakers and I should be back to stock. Oh buy the way, don't expect the TS-163P to have any highs. They don't. As expected being the tweets are paper, which is what I was looking for. So for what it's worth...

 

i recently replaced the door speakers in my 88 vert with rockford fosgate 5.25"'s i think. I put 4.5" rockfords in the dash also. I have noticed these speakers have wonderful crisp sound with highs but they handle bass for ****. Im very dissapointed. Do you thinking keeping the fosgates in the dash and throwing these cheapy pioneers in the doors would give me that bass im looking for. Im keeping the stock headrests, they seem fine. What about soundstage?? Would there be too much bass coming out of the pioneers??
i remeber in my old 88 929 i replaced the back speakers ( behind back seats) with some 6.5 pioneers, i was really surprised with the bass they had for the price. i liked them alot. still have em, but there too deep to put in the doors of the 7.

 

love it when people make posts and never check them again. pointless!

 

Sorry, I've beem in the Bay area for the wknd. But yes I threw out also my Rockford fosgates in the doors and yes the bass is more noticeable and the mid. But it's the mids that are more apparent and you do fell the "kick" more so than what the rocks were doing. They "Fill" in the space that the rockfords were SOOOO lacking in. The overall sound is "Fuller". Hope that helps. I wouldn't go back to rocks or infinitys.....