BTL N2 - 15" or 18"?

[nick_19 1]

As of now, I've got a SAZ-2500D and the electrical to back it up, so it's time to get a new sub to be powered! Here's my dilemma: I've always had 15's and experimented thoroughly with them in my car, but I feel as though it would be fun to venture into the world of 18's. However, I can only get up to about 5-5.5 cu. ft. net in my trunk. I would put the 15" in about 4.5 cu. ft. tuned to around 30 Hz. This has shown to provide a fairly non-peaky curve in my car, while being efficient and very, very low. Now, if I stuff an 18" in 5.5 cu. ft. and tune it to 30-32 Hz, will this make it significantly peakier? Will the lows be better or worse? Do you think it would be louder (perceptively) or not? Thanks for the opinions.

Goals - loud daily driver with excellent low (25-35 Hz) freq response, while not sounds like complete crap (never been into the whole ProBox thing)

[nick_19 1]

Any opinions?

[Duran 387]

Low's would most likely suffer, unless you have huge power to back up the woofer. As Hoffman's iron law goes, Efficient enclosure, low frequency extension, or small space, pick two.

[reelfish92 54]

Try to get a 15" BTL,enlosure designed to 5-5.5 cubic feet tuned @32hz, im tuned at 32 hz (18" N2 BTL,7.5 cubic feet after displacement in a yukon xl) It hits the lows well and still sounds good with reggae,and alternative rock music.

[nick_19 1]

Ok I'll just stick with the 15". I'm more familiar with designing a box around that size subwoofer anyways. Thanks y'all.

[Frostedflakejake 148]

That's unfortunate about not being able to fit the 18"

on a side note, there has been tons of Grand Prix builds lately! Or is that just me?