I was talkin to a box builder last night...He gave me some good advice.

My main goal is a LSQ system...He said go with a FI Q 18...i was like have you heard one...he said yeah...in a sealed box. He said it would sound better than the same woofer in a ported. This is what he relayed to me from an installer friend of his. I was like ok...

He said go 18 inch Q sealed 4 cu ft.....i was like how bout 7 cu. ft ported tuned to 30 hz...

I was thinking would it make a BIG NOTICABLE differance on an 18 inch Q...in those box dimensions...its an 18inch sub...thats pretty big...

or should i go with the 15...?(for LSQ)

Out of the choices. IMO The 7cuft ported one seems to be the better one.

I was talkin to a box builder last night...He gave me some good advice.

My main goal is a LSQ system...He said go with a FI Q 18...i was like have you heard one...he said yeah...in a sealed box. He said it would sound better than the same woofer in a ported. This is what he relayed to me from an installer friend of his. I was like ok...

He said go 18 inch Q sealed 4 cu ft.....i was like how bout 7 cu. ft ported tuned to 30 hz...

I was thinking would it make a BIG NOTICABLE differance on an 18 inch Q...in those box dimensions...its an 18inch sub...thats pretty big...

PORTED FOR ME HAS ALWAYS BEEN THE WAY TO GO. YOUR SUB, YOUR CHOICE!

or should i go with the 15...?(for LSQ)

I'd go sealed.

Unless you're driving a cave they'll be plenty of output.

lol... that is exactly what I drive

Im a big fan of sealed for clean/SQ oriented applications. But I have noticed that most people tend to favor the bloated bottom end of a ported enclosure. If output is a concern, ported will get you there with a larger box. Sealed will have a more natural response curve when cabin gain is factored in and will still be loud overall... just not as "fat" around tuning like a ported enclosure.

lol... that is exactly what I drive

Im a big fan of sealed for clean/SQ oriented applications. But I have noticed that most people tend to favor the bloated bottom end of a ported enclosure. If output is a concern, ported will get you there with a larger box. Sealed will have a more natural response curve when cabin gain is factored in and will still be loud overall... just not as "fat" around tuning like a ported enclosure.

The ported box...will have a boost in output...only at the tunning frequency correct? And the sealed box will be flat all around.

So basically I will still get pretty loud...Im not tryin to go to comps and all that..

I jus wanna sound good...but when i get loud...make it be clean!

At 7 cuft tuned to 28 Hz (I pushed it a little lower to flattne the response a little more) you will be about 4 dB up on the sealed enclosure. 4+ at 40, 2.5 at 50 and 2 at 60... about even at 70. The ported enclosure will definitely be louder, but itll have a bass hump in the 30-60 range vs a relatively flat and more natural response from sealed.

Thanks,

Scott

At 7 cuft tuned to 28 Hz (I pushed it a little lower to flattne the response a little more) you will be about 4 dB up on the sealed enclosure. 4+ at 40, 2.5 at 50 and 2 at 60... about even at 70. The ported enclosure will definitely be louder, but itll have a bass hump in the 30-60 range vs a relatively flat and more natural response from sealed.

Thanks,

Scott

What would it be @30hz & down?

At 7 cuft tuned to 28 Hz (I pushed it a little lower to flattne the response a little more) you will be about 4 dB up on the sealed enclosure. 4+ at 40, 2.5 at 50 and 2 at 60... about even at 70. The ported enclosure will definitely be louder, but itll have a bass hump in the 30-60 range vs a relatively flat and more natural response from sealed.

Thanks,

Scott

What would it be @30hz & down?

I was going to answer that but I will shut up.