SQ Box Ideas

JeremyC · Post by **JeremyC** » Sun Jan 15, 2006 10:28 am

Well guys after the hushmatt test I got to thinking. I know the W7 tends to perfer sealed boxes, and I don't have a ton of room to work with, but what are my other options?

Does fiberglas have a lower resonant frequency than MDF?

What about going with a smaler or larger box, instead of the 1.375 JL recomends?

I am sure you see where I am going with this.

I even thought about going with an AP enclosure, but the QTS of the W7 is a little higher than what I found recomended.

Maybe a TL, but I would need help designing it.

So lets here some ideas. I can build about anything you can come up with. I just need some ideas, or theories to play with.

I will try to get some dimensions later tonight, so we know how much room we have.

joeyc · Post by **joeyc** » Sun Jan 15, 2006 10:54 am

well when you talk AP enclosures, then TL and QTS, I have N O idea what you are talking about l m a o

JeremyC · Post by **JeremyC** » Sun Jan 15, 2006 11:09 am

http://www.caraudiomag.com/technical/0206cae_boxbasics/

http://www.usdaudio.com/products/ap.php

joeyc · Post by **joeyc** » Sun Jan 15, 2006 11:11 am

I tell you what, this is the most educational website there is!! lol

OnYrMrk · Post by **OnYrMrk** » Sun Jan 15, 2006 11:29 am

I have been toying with the idea of an aperiodic enclosure for some time now.

thanks for the link Jeremy

Ryan from Ohio · Post by **Ryan from Ohio** » Sun Jan 15, 2006 12:07 pm

1/4 wave TL box.

Figure the 1/4 wave @ mic point...

Ohhhhh nice....

BTW I think thats what the beretta is getting. Bit I literally have the whole back seat/trunk to work with

audiobass10 · Post by **audiobass10** » Sun Jan 15, 2006 1:19 pm

Pete at http://www.toxicforum.com has some CRAZY designs that you could tinker with.

JeremyC · Post by **JeremyC** » Sun Jan 15, 2006 7:03 pm

How do you know if you got alot done in a day? You look like me. (the pants and jacket are black and blue)

Jonathan · Post by **Jonathan** » Sun Jan 15, 2006 7:18 pm

The 12W7 doesn't really incline itself well for a AP or TL enclosure. If anything, infinite baffle would be better. TLs like a sub more inclined to ported enclosures, .3-.4 range if not lower.

Qts of .5 isn't damped enough to do well in either enclosure. The sub does have enough excursion to do well IB, and would give good SQ with an absence of the resonance of sealed and ported enclosures.

"Does fiberglas have a lower resonant frequency than MDF?"
The panels, or the system resonance? System resonance is going to depend on the subs suspension and box volume, in which it really isn't going to matter which one you use. The resonance of the material itself is going to depend on rigidity, in which fiberglass is going to resonate at a higher frequency than MDF because it is typically stronger. Depends on how thick the glass is, too. Same reason plywood resonates at a higher freq. than MDF.

"What about going with a smaler or larger box, instead of the 1.375 JL recomends?"

If anything go larger, aim for a .707 alignment for flat frequency response, a flat delay response is produced with an alignment of .577. Pick your poison, either is going to be a really large box, though.

JeremyC · Post by **JeremyC** » Sun Jan 15, 2006 7:22 pm

Ok I could Google it like normal, but I will jusrt ask it will be faster. What is the diffrence in a flat frequency response, and a flat delay response? How does the flat delay responce affect SQ compared to a flat frequency responce?