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-   -   Cabinet shapes (http://www.talkbass.com/forum/f15/cabinet-shapes-944416/)

Rockin Mike 12-30-2012 08:15 PM

Cabinet shapes
 
I'm no cabinet designer, just a bassist, but surely this has occurred to someone before...

If the shape of a speaker chamber doesn't matter, and we desire high rigidity and low weight, why doesn't anyone make a spherical speaker enclosure?

Obviously it would need some kind of stand so it doesn't roll over, but that's a solved problem, look at a bass drum.

Thanks in advance to the cab design experts on the board.

msaone 12-30-2012 08:22 PM

Wouldn't the head fall off?

silky smoove 12-30-2012 08:29 PM

There was a guy making cabs out of bass drum shells. There's a thread about it if you do a search.

RufusB 12-30-2012 08:30 PM

Cool idea!

bassmeknik 12-30-2012 08:31 PM

Interesting idea, If you look at modern studio monitor designs they are rounding over the front edges to minimize the front baffle area. I believe that is only helpful with higher frequencies however so although your idea would work I'm not sure it would have any measurable benefit over most squarish or rectangular boxes used for woofers.

David1234 12-30-2012 08:32 PM

Rectangles will always be easier to stack in the van. But however impractical, something round could certainly be cool!

rollerberg2000 12-30-2012 08:37 PM

I've seen this topic covered before in the past, someone has tried it.....

The biggest drawback I see for the hobby builder is walking into Home Depot or Lowe's looking for board footage in pi...

superjesus 12-30-2012 08:45 PM

A rectangular prism maximizes volume for a given area of square footage more so than non-rectangular shapes.

bassmeknik 12-30-2012 08:48 PM

Quote:

Originally Posted by David1234 (Post 13646482)
however impractical, something round could certainly be cool!


+1 indeed it would be :cool:

esa372 12-30-2012 09:01 PM

Here are a few quotes from someone who knows what he's doing:

Quote:

Originally Posted by billfitzmaurice (Post 12543410)
A hemispherical or semi-cylindrical rear chamber is a very good shape for strength to weight, resonance control and internal reflection control. The problem with those shapes is the small internal volume relative to the external linear dimensions. That's why you see them used in small hi-fi satelllite midrange speakers that don't need much interior volume, but not in bass cabs that do.

From http://www.talkbass.com/forum/f15/wh...-shape-876297/


Quote:

Originally Posted by billfitzmaurice (Post 5618648)
Odd shapes are of some use with midranges and tweeters but they're generally a bad idea with woofers, as they usually result in less box volume for a given footprint, the result being less sensitivity and LF extension.

From http://www.talkbass.com/forum/f15/ab...binets-426995/

T-Bird 12-30-2012 09:02 PM

Hi.

Quote:

Originally Posted by Rockin Mike (Post 13646428)
I'm no cabinet designer, just a bassist, but surely this has occurred to someone before...

If the shape of a speaker chamber doesn't matter, and we desire high rigidity and low weight, why doesn't anyone make a spherical speaker enclosure?


There's been a few spherical speakers over the years, but as the sphere is -in the speaker enclosure design POV anyway- among the worst, those have been very short lived in MI field.

Regards
Sam

dspellman 12-30-2012 09:11 PM

Quote:

Originally Posted by Rockin Mike (Post 13646428)
If the shape of a speaker chamber doesn't matter, and we desire high rigidity and low weight, why doesn't anyone make a spherical speaker enclosure?

It's come up, but it's an inefficient use of external space for a given internal cabinet space. In short, it's going to take up a lot more space on the back seat of your Honda Civic.

bassmeknik 12-30-2012 10:00 PM

Quote:

Originally Posted by dspellman (Post 13646625)
It's come up, but it's an inefficient use of external space for a given internal cabinet space. In short, it's going to take up a lot more space on the back seat of your Honda Civic.

Thinking about it geometrically, the diameter of a spherical cab would be larger than a single side of any similar volume cube for a given volume, so just getting it through doors could be a problem. This also means you could only use drivers that can perform well in small enclosures.

Passinwind 12-30-2012 10:10 PM

Quote:

Originally Posted by Rockin Mike (Post 13646428)
If the shape of a speaker chamber doesn't matter, and we desire high rigidity and low weight, why doesn't anyone make a spherical speaker enclosure?

Follow the links here to see one aspect of why cab shape does in fact matter. ;)

chadds 12-31-2012 07:01 AM

Quote:

Originally Posted by David1234
Rectangles will always be easier to stack in the van. But however impractical, something round could certainly be cool!

Then your drummer would have company when it was time to roll around inside the van.

1958Bassman 12-31-2012 07:10 AM

Quote:

Originally Posted by bassmeknik (Post 13646477)
Interesting idea, If you look at modern studio monitor designs they are rounding over the front edges to minimize the front baffle area. I believe that is only helpful with higher frequencies however so although your idea would work I'm not sure it would have any measurable benefit over most squarish or rectangular boxes used for woofers.

The rounded edges reduces diffraction of the sound and the problems this causes. Narrow baffles need special compensation in the crossover in order to minimize that effect, too.


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