Benefits of multi-chambered cab?

[gregoire1]

It seems many cabs used dividers to seperate speakers, even when the drivers are the same freq band (like 2x15 or 8x10) is there any sonic benefit to this? I realize an 8x10 with 4 chambers protects the 6 seperate speakers if 1 fails (leaving a 10 inch hole in your cab), but, is there any other reason for doing this? and am I spelling seperate correctly?

thanks, greg

[Mr. Foxen]

Panel bracing. Makes it all very solid without much extra effort like perforating them.

Plus the speaker protection is a fairly major think, quite a few aspects of the 8x10 are for it not taking anything with it when a speaker dies.

[gregoire1]

Originally Posted by Mr. Foxen

Panel bracing. Makes it all very solid without much extra effort like perforating them.

Plus the speaker protection is a fairly major think, quite a few aspects of the 8x10 are for it not taking anything with it when a speaker dies.

thanks

[bassybill]

separate

[gregoire1]

Originally Posted by bassybill

separate

I knew it looked wrong, but it felt soooo right.

[username1]

The main reason for seperate chambers is to reduce standing waves in the cabinet which will affect the sound in a negative way, especially in a big cab.

[T-Bird]

Hi.

Originally Posted by bassybill

separate

or perhaps




I'm far from perfect when it comes down to grammar and the correct usage of words, but I do try my darnest to get the basics right.


As for the subject at hand, rigidity is the primary reason.
Standing waves are fought with non-parallel surfaces, not with parallel ones. Decreasing one of the dimensions only one of the frequencies is changed.

Regards
Sam

[shadow_FIX]

Originally Posted by gregoire1

I knew it looked wrong, but it felt soooo right.

I do this all the time with the word "weird"...for some reason I always have to override the compulsion to spell it wrong.

Wierd, isn't it?

[Mr. Foxen]

Originally Posted by username1

The main reason for seperate chambers is to reduce standing waves in the cabinet which will affect the sound in a negative way, especially in a big cab.

That's what Ampeg say, not much actual to back it up, will still be standing waves inside, if they really wanted to break them up they'd line the cab with knobbly foam, or more ideally stuff it.

[PhiDeck]

If you chop the interior of an Nx10 (N=2,4,6,8) into chambers that are 1 ft x 1ft (x the depth of the cabinet) the 1 ft dimensions yield standing waves at 565 Hz and integer multiples thereof.

The presumably unchanged depth (15 in) yields standing waves at 452 Hz and integer multiples thereof.

Without the chambering, the horizontal fundamental standing wave drops to 283 Hz (half), and the vertical to:
4x10: 283 Hz
6x10: 188 Hz
8x10: 142 Hz

All numbers are approximate and do not account for the extra 1/2-3/4 inch you pick up when you remove an interior partition.

One could make the argument that moving enclosure resonances to higher frequencies, at which one is injecting less energy from the amp and where damping materials work better, is a good thing. The trick, for ported enclosures, is then finding a place to locate the ports.