Is the manifold usable up to 100-200Hz?

[grind]

Hi, Lords!
Is the manifold Helmgoltz resonator with terrible peak at 1xx Hz (for ~1x1x1’ box)??

I’m planing built full IB system, with low\mid crossing (at first time) about 100-2xx Hz. Speakers wall isn't enaugh hard and manifold idea had seems attractive..


and so folded manifold - what can your say about?


excuse my pigeon-english, please.

[ThomasW]

Aug 6, 2009 2:36:13 GMT -7 grind said:

Is the manifold Helmgoltz resonator with terrible peak at 1xx Hz (for ~1x1x1’ box)??

That's why they're used for subwoofers not midrange speakers

I’m planing built full IB system, with low\mid crossing (at first time) about 100-2xx Hz. Speakers wall isn't enaugh hard and manifold idea had seems attractive..

100-2xx Hz is for a woofer not a subwoofer.

You'll need appropriate drivers for the higher frequencies. Those should be mounted to a flat baffle and fire directly toward the listener.

[grind]

thanks, Tomas! it's coincide with my opinion. (I almoust prepare to saw, but then had thought ;D)
Woofers (not sub-) will be with really low Fs and huge Vas..
Can somebody recommend any resourses about inwall (IB) acoustic insallation?

[ThomasW]

Aug 6, 2009 9:15:11 GMT -7 grind said:

Can somebody recommend any resourses about inwall (IB) acoustic insallation?

Nothing about the construction. Look at the line array subs on this forum, follow the approach they used. The main idea is to limit flexing of the wall. Also you'll want to consider having the center of the higher frequency drivers close to ear level.

Consideration must be given the layout of the drivers in the wall. MTM, MT, WMTMW or whatever will determine their lobing pattern into the room. Programs like 'Baffle Diffraction Simulator' or 'The Edge' (google for these) can help