what wrong?

[94civic]

today i hooked up my 2 type r's to my friends car with the jbl 600.1 and it didn't sound right. the sub looks like it reaches maximum excursion when playing it at only half way up on the deck(its a pioneer deh-p5200). it also sound like air is coming out of the box which doesn't sound good cause its supposed to be a sealed box. i had the input level on the amp turned up halway the crossover all the way down and the bass boost turned up 3/4 of the way. when the trunk was opened it didn't sound good. then when i closed the trunk you can feel your pant legs vibrating from all the bass(it sounded good with the trunk closed) then i went in the car and it was loud, but the inside the car had less bass than outside. i have both of the rca inputs plugged in via y cables. i have the speakers wired in paralell, i'm not sure if i did it right, this is how i paralelled each sub. from positive to positive, then i hooked up the negative to negative and to the amp. i have each sub hooked up to a seperate channel so the amp is seeing a 2ohm load from each sub on each channel so its putting out 300watts rms to each sub. when i had the subs hooked up to my home stereo that puts out only 50 watts per channel they were shaking the whole house and sounded good when i turned it up. it didn't look all sloppy but nice and tight when the cone was moving unlike in the car. Could it be my box that has a leak in it? i liqiud nailed all the edges, corners, sides and anywhere else the air can come out of. could it be the headunit that is not set correctly? my friend had his system in there and it sounded nice for 2 pioneers in a bandpass box and a piece of shit legacy amp(with this it shakes my front porch) so i don't think there is a problem there. btw the box has .78ft^3 of airspace with sub displacment tooken out. could it also be my settings on the amp or how i hooked it up. let me know what you think and tell me how i should hook it up.
Thanks


here is a link to the pics of my box
http://members2.photofun.com/94civicex/Audio

[GSteg]

find out where the air is leaking from and seal it. keep the bass boost on the amp lower. 3/4 of the way is too high. try go about 1/4 and turn the gain SLIGHTLY higher than the one right now.

BTW...did you glue inside the box? if not, then you should.

[94civic]

i glued the inside and out, i think there is air coming out of the plexiglass side, but i'm not sure