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Speaker box dimensions question
Speaker box dimensions question
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Old 9th November 2018, 04:57 AM   #1
tacoman5000 is offline tacoman5000
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Default Speaker box dimensions question

This is a newbie question but, would there be a problem if a speaker box has perfectly square dimensions, say a floorstander that's 9" x 9" x 44"? I'm not aware of any rule regarding this, it's just I haven't seen a single speaker box with such dimensions, and I want to make my speaker project this way.

If there's a problem with this please let me know
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Old 9th November 2018, 05:26 AM   #2
picowallspeaker is offline picowallspeaker  Italy
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The speaker membrane acts as divider between what it produces front ward and backward. You want only forward emission but the rear emission cannot be blocked at the expense of the front...they are indeed connected. The form of a pipe applied to the back (but also to the front but with the exclusion of the inverse cone shape and the addition of the basket and the magnet) produces a hollow sound, because of the cavity effect (?!?) of the pipe. You'll find written that inside enclosures it will happen strange phenomenons like stationary /standing waves (!??) or the internal propagation of many interfering waves at various amplitudes and frequencies
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Last edited by picowallspeaker; 9th November 2018 at 05:34 AM.
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Old 9th November 2018, 08:00 AM   #3
Charles Darwin is offline Charles Darwin  United Kingdom
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Generally the rule is do not make the internal dimension the same or multiples of each other.

That is why you don't see speakers with your dimensions since in your case width=depth and height=5x width.
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Old 9th November 2018, 08:59 AM   #4
tacoman5000 is offline tacoman5000
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Quote:
Originally Posted by picowallspeaker View Post
The speaker membrane acts as divider between what it produces front ward and backward. You want only forward emission but the rear emission cannot be blocked at the expense of the front...they are indeed connected. The form of a pipe applied to the back (but also to the front but with the exclusion of the inverse cone shape and the addition of the basket and the magnet) produces a hollow sound, because of the cavity effect (?!?) of the pipe. You'll find written that inside enclosures it will happen strange phenomenons like stationary /standing waves (!??) or the internal propagation of many interfering waves at various amplitudes and frequencies
Thanks for replying, though I didn't really understand anything haha.
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Old 9th November 2018, 09:00 AM   #5
tacoman5000 is offline tacoman5000
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Quote:
Originally Posted by Charles Darwin View Post
Generally the rule is do not make the internal dimension the same or multiples of each other.

That is why you don't see speakers with your dimensions since in your case width=depth and height=5x width.
Great, thanks for the info!
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Old 9th November 2018, 09:09 AM   #6
Lojzek is offline Lojzek  Croatia
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They don't do this kind for it looks rather less elegant. It won't matter once you stuff the enclosure appropriately, as it should be in any case.
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Old 9th November 2018, 09:21 AM   #7
tacoman5000 is offline tacoman5000
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Quote:
Originally Posted by Lojzek View Post
They don't do this kind for it looks rather less elegant. It won't matter once you stuff the enclosure appropriately, as it should be in any case.
I see, that makes sense. I don't think I'm bold enough to attempt something so off-kilter for my first build so I'm back to the drawing board for the cabinets.

I'd like to attempt tall square cabinets someday though!
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Old 9th November 2018, 10:16 AM   #8
turk 182 is offline turk 182  Canada
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you may want to read up on "Golden Ratio" theory since your saying that you don't know of any rules regarding box dimensions.

and keep in mind that external shape doesn't mean the interior is the same, it could contain panels for a transmission line or backloaded horn or holey braces to reduce the effect of standing waves.

Last edited by turk 182; 9th November 2018 at 10:25 AM.
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Old 9th November 2018, 10:40 AM   #9
tacoman5000 is offline tacoman5000
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Quote:
Originally Posted by turk 182 View Post
you may want to read up on "Golden Ratio" theory since your saying that you don't know of any rules regarding box dimensions.

and keep in mind that external shape doesn't mean the interior is the same, it could contain panels for a transmission line or backloaded horn or holey braces to reduce the effect of standing waves.
I'll read up on that, thanks!
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Old 9th November 2018, 09:58 PM   #10
GM is offline GM  United States
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Right, boxes, etc., have standing waves [eigenmodes] same as rooms, just higher in frequency simply because the box is tiny relative to a typical room, so to keep these standing waves from audibly modulating the driver[s], the easiest thing to do is shape it in a golden or acoustic ratio to drastically reduce the amount of internal damping required to fine tune it: HyperPhysics

Very high aspect ratio boxes have 1/4 pipe [TL] resonances, so offsetting the driver [or vent if used] at an odd harmonic along its line damps it somewhat: Resonances of open air columns

GM
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