What Enclosure for 4x kef B139-1024 and 4xb110? - diyAudio
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Old 20th April 2010, 01:26 PM   #1
galop is offline galop  Slovenia
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Default What Enclosure for 4x kef B139-1024 and 4xb110?

Hello i have 4 kef b139 and 4 kef b110 speakers.I want to make separate enclosures for this drivers.I like big enclosures and very low bass.What do you suggest?
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Old 20th April 2010, 02:38 PM   #2
galop is offline galop  Slovenia
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I write wrong,i want to make separate enclosure for bass and separate for mid,2 x b139 and 2 x b110 per channel.What kind of box do you suggest (bass reflex,transmision line or something else for bass)?Size of cabinet is not problem.
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Old 20th April 2010, 03:00 PM   #3
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Old 20th April 2010, 04:06 PM   #4
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If i remember correctly the B139 has a Qts of 0.375 & a Vas of about 3cuft. As it's bass resonance is approximately 29.5Hz why not stuff each one in a 3cuft (3 cubic foot) box tuned by a reflex port to 30Hz

F3 will be at the box tuning frequency, is 30Hz -3Db good enough? If not then tune it lower & expect a more gradual rolloff from a higher frequency.
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Old 20th April 2010, 05:23 PM   #5
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Scott & i did a modern TL for the B139. So far i have drawn up 3 variations. Transmission Line Speakers

A friend has built these ones (he shortened them a couple inches to fit in his room):

Click the image to open in full size.

He likes them alot.

dave
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Old 20th April 2010, 07:33 PM   #6
jerryo is offline jerryo  Isle of Man
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Hi galop,
try a google search for "Linn Isobarik DMS" They use the B139 in an isobarik loaded cabinet of about 55 litre's or thereabouts. They are famous for delivering really good very low bass in quantity. I have a pair and I can agree with that.
Worth a look for ideas.
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Old 20th April 2010, 08:09 PM   #7
a.wayne is offline a.wayne  United States
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Are B139's or such type woofers still available ?
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Old 20th April 2010, 08:10 PM   #8
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Quote:
Originally Posted by a.wayne View Post
Are B139's or such type woofers still available ?
Only on ebay or suchlike as far as i know They are long out of production.
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Old 21st April 2010, 11:09 AM   #9
galop is offline galop  Slovenia
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Quote:
Originally Posted by event horizon View Post
If i remember correctly the B139 has a Qts of 0.375 & a Vas of about 3cuft. As it's bass resonance is approximately 29.5Hz why not stuff each one in a 3cuft (3 cubic foot) box tuned by a reflex port to 30Hz

F3 will be at the box tuning frequency, is 30Hz -3Db good enough? If not then tune it lower & expect a more gradual rolloff from a higher frequency.
Maybe this design would be ok.I was thinking about coffin sub ,but i need to build 2 ,because i have 4 drivers.but i dont know what will happen if i put 2 coffin subs on the left and right side of the room.(phase interference etc??)
1 cubic feet is 28 ,31 litres?

Last edited by galop; 21st April 2010 at 11:12 AM.
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Old 21st April 2010, 05:22 PM   #10
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Quote:
Originally Posted by galop View Post
1 cubic feet is 28 ,31 litres?
Yes So effectively you'd need about 85L + port volume & any bracing as well as a bit to add for each driver

If you were driving them via a seperate amp (for the subs) there is no reason why you couldn't alter the phase to any sub to bring the whole lot into time alignment, well with a bit of fiddling about anyway
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Last edited by event horizon; 21st April 2010 at 05:24 PM.
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