Can I I.B. ? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 11 Old 10-16-15, 12:36 AM
GPM
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Join Date: Jan 2007
Location: Chamblee, Ga.
Posts: 264
Re: Can I I.B. ?

Quote:
dan77 wrote: View Post
It's all about the speaker you choose, you will need a minimum of 4 times the VAS rating of the speaker (for volume). But optimally 10. So find out which IB speaker you are interested in and use those specs to see if you have enough volume.
Right; now WRT the shape of the I.B., if it has a high aspect ratio such 1.5 x 4 x 22 ft, then instead of the ~uniform particle density that a speaker program assumes, it's a 1/2 WL resonator, so room modes will dominate its frequency response, making driver positioning critical for best overall performance, i.e. needs to be at an odd harmonic of the longest dimension in two planes of both this short wall 'sub' and the room wall height, width, so finding a solution will set the shelf height.

I learned this the hard way with a 300 ft^3 false wall IB loaded with a stereo pair of dual 15" 'subs' XO'd at 120 Hz. With no way to EQ it beyond the bass tone control on the amp, it was horrible since I'd positioned them to just look good. Even if I'd had today's digital EQ, I still couldn't have done anything about the huge dips except by shelving the rest, which was a no-no due to the low power available meant keeping efficiency high, especially since I was mating them to SET driven theater horns.

Bottom line, doing this right requires the fewest drivers, but this often causes too many compromises in the system design unless the woofers are placed in the corners [horizontal and/or vertical], so most folks resort to making a 'wall of sound' with lots of inexpensive drivers and relatively little power, then EQ it.

GM

Almost forgot: http://ibsubwoofers.proboards.com/

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

Last edited by GPM; 10-16-15 at 12:42 AM.
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