Volt 3143 FB conundrum - diyAudio
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Old 1st March 2013, 09:39 AM   #1
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Default Volt 3143 FB conundrum

Hi Guys
I am working on a box for 3-12" Volt 3143's and a ATC mid and SS 9700.I seem to not be in agreement with my designer on the box vent(front firing).
The box is 13w x 58h x 23.75d(inside dimensions).My designer says a vent of
4"h x 13w x 8d for a F3 of 34.9hz,Fb of 31hz.
The owner of the speakers was hoping for a little deeper F3,Fb.

Volt 3143

fs-34
Qa 5.7
Qe .37
Qt .35
Vas 76l
xmax 5.2mm

anyone have any experience with these?
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Old 1st March 2013, 10:08 PM   #2
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no one?
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Old 2nd March 2013, 10:15 AM   #3
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Location: Birmingham, UK
Build copies of these:

XB2 | PMC Loudspeakers
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Old 6th March 2013, 01:24 AM   #4
bjorno is offline bjorno  Sweden
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Location: Jacobsmountain
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Quote:
Originally Posted by mclsound View Post
Hi Guys
I am working on a box for 3-12" Volt 3143's and a ATC mid and SS 9700.I seem to not be in agreement with my designer on the box vent(front firing).
The box is 13w x 58h x 23.75d(inside dimensions).My designer says a vent of
4"h x 13w x 8d for a F3 of 34.9hz,Fb of 31hz.
The owner of the speakers was hoping for a little deeper F3,Fb.

Volt 3143

fs-34
Qa 5.7
Qe .37
Qt .35
Vas 76l
xmax 5.2mm

anyone have any experience with these?
A late response:Yes but not when using 3 in parallel that for me is a 'conundrum'= Why? is it necessary to present a 2 Ohm load for the amps.

b
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File Type: jpg 3xVoltR3143_ML-TL.JPG (581.1 KB, 120 views)
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Old 6th March 2013, 09:48 AM   #5
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he has a Krell KSA 250(good to 1ohm) and a 2.7ohm load is fine for it.
Thanks for the proof B...We cut wood and the new dimensions are now
13w x 20w x 66h which is close to the same volume.
So you want to see the drivers sittin up from the vent?correct?
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Old 6th March 2013, 10:49 AM   #6
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You could use the 16Ohm version of the Volt and end up with a 5.33 Ohm load.
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Old 6th March 2013, 10:51 AM   #7
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I already have them..
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Old 6th March 2013, 10:59 AM   #8
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I thought that there was a 80% chance that you did but thought I mention it just in case.;-)
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Old 6th March 2013, 11:06 AM   #9
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I have these for my pals speakers
and 4-2500/10" midbass for my new project and 6/ 8" for center and surrounds.
I was thinking on using the 8"(MB,M,T,MB)but not sure they will withstand the sometimes odd lower fs punishment of 40-50hz.But if the 10's donnot image well,then I will try the 8
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Old 6th March 2013, 11:27 AM   #10
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That's a lot of Volts!


At the moment I'm just happy that the T/Ls I built for my 3143s almost ten years ago using mostly semi-educated guesstimates and a lot of inspiration from PMCs XB2 are practically identical to Bjorno's 3rd version.
Phew…
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