Cabinet for small 3" fullrange speaker - diyAudio
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Old 12th February 2014, 06:00 PM   #1
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Default Cabinet for small 3" fullrange speaker

So i got my hands in a pair of very sweet little 3" full-range speakers. I am very new in terms of cabinet construction, so i went ahead and used some of the existing tools online.

So i typed in all the data which i had and it gave me following results:

Vb = 0.09 ft3 = 2.43 lts
= L x W x H
f3 = 71.86 Hz
fb = 82.14 Hz
Dv = 1 in = 2.5 cm
Lv = 2.83 in = 6.93 cm

Before i start drilling, cutting and losing infinite amounts of blood it would be nice to know if the calculations are totally off or in the right direction.

All info is attached!
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File Type: jpg A320 FR.JPG (107.3 KB, 577 views)
File Type: jpg 7EE6DD98@2F06B678.A925FA52.jpg (92.0 KB, 572 views)
File Type: png Skærmbillede 2014-02-12 kl. 19.55.40.png (147.1 KB, 585 views)
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Old 12th February 2014, 10:47 PM   #2
thedoc is offline thedoc  United States
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That box would work ok for nearfield listening but power handling will be quite limited due to box being tuned below the fs of the driver. Plus with a qts close to 0.6 its more suited to a sealed box or a transmission line.
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Old 12th February 2014, 11:04 PM   #3
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Quote:
Originally Posted by thedoc View Post
That box would work ok for nearfield listening but power handling will be quite limited due to box being tuned below the fs of the driver. Plus with a qts close to 0.6 its more suited to a sealed box or a transmission line.
I calculated for the sealed box, but my Fb and F3 went in the wrong direction. I dont have much experience with transmission line (yet), but i want to go for a extremely simple built which will give a great result.
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Old 12th February 2014, 11:15 PM   #4
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Those figures were about what I got also.
2.4 Liters, Fb 82.14 Hz., -3.05Db@ 72.11 Hz. 30mm by 107mm port

Stretching the tuning, about as far as would dare, I got this.
3.3 Liters, Fb 76 Hz., -3.07 Db@66.53 Hz., 30mm by 87mm long port. The curve in response is acceptable.

Going sealed will have a rapidly falling curve, requiring lots of power for radical EQing.....Either will have you EQing to get SOME bottom end.


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Old 12th February 2014, 11:19 PM   #5
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According to the manufacturer, which i cant really promise is reliable intel, a ported box should be used. If i go for the 3.3 L, how do i determine the total size of the box, assuming that i should have a depth deep enough for the port to reach, but how much space does the port require in the end point?

Quote:
Originally Posted by Richard Ellis View Post
Those figures were about what I got also.
2.4 Liters, Fb 82.14 Hz., -3.05Db@ 72.11 Hz. 30mm by 107mm port

Stretching the tuning, about as far as would dare, I got this.
3.3 Liters, Fb 76 Hz., -3.07 Db@66.53 Hz., 30mm by 87mm long port. The curve in response is acceptable.

Going sealed will have a rapidly falling curve, requiring lots of power for radical EQing.....Either will have you EQing to get SOME bottom end.


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Old 12th February 2014, 11:28 PM   #6
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Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Using the much maligned "acoustic ratio" 1.2599:1:.7937 I get 148mm by 118 mm by 187 mm.
So we have the driver mounted on the 118mm panel, the 87mm long port reaching from the front baffle, leaving 31mm, plenty space, especially considering we haven't taken into consideration some 18mm worth of panel thickness. 31 - 18= 49mm clearance


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Old 12th February 2014, 11:42 PM   #7
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Originally Posted by Richard Ellis View Post
Using the much maligned "acoustic ratio" 1.2599:1:.7937 I get 148mm by 118 mm by 187 mm.
So we have the driver mounted on the 118mm panel, the 87mm long port reaching from the front baffle, leaving 31mm, plenty space, especially considering we haven't taken into consideration some 18mm worth of panel thickness. 31 - 18= 49mm clearance


______________________________________________Rick .......

A little sketch on the construction.
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Old 12th February 2014, 11:49 PM   #8
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Another thing, how do i determine the exact position of speaker and port on the front panel?

Last edited by RobFreak; 12th February 2014 at 11:56 PM.
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Old 13th February 2014, 12:39 AM   #9
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If I understand baffle-step correctly ( & I think I do), the absolute worst application would be a square front baffle with the driver exactly centered.
This would tend to tend to "launch" a narrow band of frequencies off the baffle board. My take is the application of "oddities", or more descriptively a location of....Driver centerline up 63%(? .707 ?) of front baffle vertically, offset 56% horizontally.....port centerline 66% vertically, 59% horizontally...........
Get the picture? I'm sure there is a mathematical construct here but I'm not aware of such.
The idea is to have a broad-band of frequencies that results from an almost random locating of sound "emitters" from the front baffles.
As a point of reference, note the odd location of the Infinity Qa & Qb woofer on its baffle.



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Old 13th February 2014, 03:46 AM   #10
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