Jonathan T

Passive radiator vs. Vented

I modeled 1 AV-15 with both passive radiators and as a vented box. At 5 cubic feed, the output is almost identical. But, what's the difference SQ wise?

O, and do you think a 5 cubic foot sealed Av-15 would be sufficient for most movie sound tracks (assuming I don't want to break windows)?

Square Rooms=teh scuk

MattD

How big is your room? I have an AV12 in a 14'x20' room and it is more than enough to rattle pictures off the wall.

Eric Eash

there shouldn't be too much difference in SQ. the PR sub might have a little bit better transient response. mainly, PR are great for small boxes as a low tuned vented box can require more room for a vent than available, and most people don't want their port sticking a foot out of their enclosure. if you're box is big enough, vented is waaaay cheaper.

eric

Rob Formica

PR's also eliminate the risk of any port noise... so they do have a slight SQ advantage. But then again, as already mentioned, the main benefit is providing low tuning in a small enclosure.
Rob

*Shedding light by means of the combustion of snake oil* PC-ABX

Jack Gilvey

The transient response of a PR sub is measureably inferior to the "same" alignment using ports. You've got to have better ears than mine (and a better room) to hear it, though. The advantage is that you can have adequate resonator Vd in a small box.

Jonathan T

The room I would be using is about 18X12. It's open on one side. I was thinking of using 2 subs because I read a paper somewhere that said 2 subs or more can can help nullify "bad" nodes and excite the "good" ones.

Square Rooms=teh scuk

Jonathan T

Thanks for the info on PRs. I was really just curious as to each would sound. I don't have money for 4 100 dollar PRs for 2 AV-15 subs. So, it's gonna be either sealed or ported. And it'll probably be sealed, as this will be a 2 channel system. I don't have money for a multichannel theater right now.

Square Rooms=teh scuk

Allen Ross

why not ported, you need the small enclosure?

Member and Founder of the \"Its Never to Big or too Loud to have in a Dorm Club\"
Everyone in college should have a 9 cuft Tempest in their closest!

Jonathan T

Well, no, but sealed enclosures are condusive to "tighter" bass, correct?

It's been a while since I've discussed or thought about DIY audio

Square Rooms=teh scuk

AllanRW

I did a AV15 in a 24" cube for Craig WoodhallCraigs ported AV15
As far as I know he is very happy with it.


Al

Craig Woodhall