KEF B139 as subwoofer

[TheBaronGroog]

http://www.tech-diy.com/Loudspeakers...-Subwoofer.pdf

[awty]

Hi sorry to dig up an old post, but was wondering if anyone had any success with building one of the subs or similar using a pair of b139's?

I was thinking of giving the above link a go, as it seems to be a fairly easy and cheap construct and might be suitable for my small room.
Any recommendation on measurements and wiring? If not I might just guesstimate.

[planet10]

3 TL variations.

Transmission Line Speakers

dave

[awty]

I thought about doing one of those, but there a little too BIG for my allotted space.

How would you wire them?

[bjorno]

Originally Posted by awty

I thought about doing one of those, but there a little too BIG for my allotted space......

Hi,
Here is an idea if you have measured similar T/S for two of your KeB139b drivers in an isobaric configuration:

b

[sreten]

Originally Posted by awty

Hi sorry to dig up an old post, but was wondering if anyone had any success with building one of the subs or similar using a pair of b139's?

I was thinking of giving the above link a go, as it seems to be a fairly easy and cheap construct and might be suitable for my small room.
Any recommendation on measurements and wiring? If not I might just guesstimate.

Hi,

You might as well guestimate the dimensions, they are not critical.
Wiring and c/o depends how you intend to drive them, 4 ohm plate amp ?

rgds, sreten.

[TheBaronGroog]

How much space have you got to play with? My design actaully models well (not bad for a1st attempt tapped horn that I just sketched out!) just need a clear weekend to build it

[letimagesbefree]

Originally Posted by andyjevans

I have a couple of these, which I could either sell if anyone is interested, or otherwise build subs with. I don't have space for a TL, so the sub would have to be IB or ported. Can anybody point me to a functional design that's as small as possible? I don't mind flat to 40hZ - don't listen to organ music and low E on the double bass is the lowest note I'm interested in. Thanks for all suggestions. Andy

Sorry ol' chap but this unit cannot be used as a sub. (only > 28Hz)

[awty]

Originally Posted by sreten

Hi,

You might as well guestimate the dimensions, they are not critical.
Wiring and c/o depends how you intend to drive them, 4 ohm plate amp ?

rgds, sreten.

I only have odds and sods. An old Amber 17 preamp drives two intergrated amps, a Rocksan Caspian intergrated which drive a couple of old 8" Richard Allan full range in a DIY TQWT cabinet and a old TEAC AS-100 I was going to use for the KEF woofers......and I might add a couple of tweeters in as well.
I'm not technically savy so it will be pretty basic and may not be optimum, but will give me something to muck around with......and one day when I know more I'll do something a bit better.

What distance apart should they be? by the looks of the photos its around 4"

[awty]

Well I went and built one (Dipol-Subwoofer mit KEF B139) out of 45mm ply, weighs a ton. Got it stuck in the only space I can find for now and have it hooked up to my Teac set on mono and the bass up and treb down until I can work out how to wire it up better.

Sorry for the lousy photo will post up a better one if anyone's interested.

Any advise on how to wire it would be appreciated, sorry I'm not tech savvy so you'll have to dumb it down for me .