cabinet design: best frequency range to block

perfusionist · 26th September 2005, 03:13 AM

I have happened upon a method I think will work for isolating a cabinet from resonance utilizing constrained layer damping and some other materials. The problem is its more like a band-pass filter for a particular freq range, it cannot block all. It can only block frequency RANGE from passing from the inside of the speaker, and resonating from the outside of the box. The narowwer the range of frequencies, the better I can block them by altering the natural resonant frequency of the box. So I pose a question: what is the narrowest range of frequencies that if blocked, would improve a loudspeakers performance. I am looking for answers between 20-22,000, not trolls. Something like 300-3000 is my first guess, the most sensitive part of hearing, supposedly. Reasoning for your answer would be appreciated as well.

mike.e · 26th September 2005, 03:26 AM

Having no box solves the problem.

Id consider anywhere between 500hz-2khz.Your changing the 'voice' of the box,and want to reduce the most audible part,as you know.

See the measurements of loudspeaker vs enclosure output from HARWOOD etc in the 60s.

ply + similar thickness bitumen helps out alot. B&W honeycomb fancy stuff looks interesting too.
Cant help much sorry.

454Casull · 26th September 2005, 03:34 AM

The higher frequencies are easily absorbed by stuffing.

26th September 2005, 03:13 AM	#1
perfusionist diyAudio Member Join Date: Oct 2003 Location: Tejas	cabinet design: best frequency range to block I have happened upon a method I think will work for isolating a cabinet from resonance utilizing constrained layer damping and some other materials. The problem is its more like a band-pass filter for a particular freq range, it cannot block all. It can only block frequency RANGE from passing from the inside of the speaker, and resonating from the outside of the box. The narowwer the range of frequencies, the better I can block them by altering the natural resonant frequency of the box. So I pose a question: what is the narrowest range of frequencies that if blocked, would improve a loudspeakers performance. I am looking for answers between 20-22,000, not trolls. Something like 300-3000 is my first guess, the most sensitive part of hearing, supposedly. Reasoning for your answer would be appreciated as well.

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26th September 2005, 03:26 AM	#2
mike.e diyAudio Member Join Date: Sep 2004 Location: NZ	Having no box solves the problem. Id consider anywhere between 500hz-2khz.Your changing the 'voice' of the box,and want to reduce the most audible part,as you know. See the measurements of loudspeaker vs enclosure output from HARWOOD etc in the 60s. ply + similar thickness bitumen helps out alot. B&W honeycomb fancy stuff looks interesting too. Cant help much sorry.

26th September 2005, 03:34 AM	#3
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	The higher frequencies are easily absorbed by stuffing.