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so i just want to know how much bump you gain and how much quality you lose from using a bandpass compared to a ported.
thanks

You can get about a 6-10 dB gain with a PROPERLY DESIGNED AND BUILT bandpass.

This doesnt mean the ones at Best Buy!

They only play choice frequencies good. I would avoid...

it really depends on what order the box is and how it's built.
generally the more gain you get from a BP box, the higher it'll be tuned, so the more SQ you'll lose. Generally you'll see zero to six decibels of gain over a ported box, on average. The problem is that most 4th order boxes are tuned around 45-65Hz, and quite frankly that sounds like crap if you want any sort of deep bass.
bandpass, like ported boxes, roll off like a brick wall below the tuned frequency.

whats the loudest box i could get while still have SQ and good lows

Ported simply put

you have to be real careful with bandpass. i have built a few and they have involved a lot of calculation and were in instances where it made the most sense, mostly trucks where behind the seat space was non existent. in a car i would reccomend ported or sealed...

What cd's do you guys listen to with lots of bass I dont know Much about rap ive been into the punk scene for a while I know a couple rappers though

what kind of car?
you could go ported or snailshell depending on the space available and skill level of the builder.

lets see....blackhawk sounds good, nice and tight...........metallica, motley crue of course, pantera,highly recommend cowboys from hell............anything by waylon jennings or any of the outlaws stuff.......faster pussycat, merle haggard, george strait of course....... dont know any rap stuff, im sure there is doc somebody or p something or other though that someone will recomend. although i do like the autosound 2000 test disc for setup and there is a bass mekanic disc i use at work

is the ported kicker enclosure any good