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Old 11th January 2012, 02:09 AM   #1
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Default BFM Titan 39

i don't see much talk around other forums about Bill's designs. I have never been able to find negative feedback or actual comparisons. I have always wondered about the T39 design. I have never seen actual measurements or an AB comparison. I have seen the T48 measurements tho. there is a lot of praise on his forum in the review section, but i know everyone has their own ideas about what sounds good. i've always found good info here, so thought i would ask if anyone has experienced some of his designs, for example the T39. I've had the plans for many years, but became discouraged to build them after reading his forum. too good to be true IMO maybe. i did see that the eminence lab 12 and 15 are being installed in his sub designs now. i guess my question is Why don't we hear more about his designs?
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Old 11th January 2012, 02:55 AM   #2
jbell is offline jbell  United States
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You mean these???

they are +12db at 100hz compared to 40hz and roast hot dogs wonderfully.

Nothing wrong with them if that's what you're after.
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Old 11th January 2012, 03:56 AM   #3
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Originally Posted by jbell View Post
You mean these???

they are +12db at 100hz compared to 40hz and roast hot dogs wonderfully.

Nothing wrong with them if that's what you're after.
hahah jbell. i like mustard on my hot dogs. +12 ouch.
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Old 12th January 2012, 11:40 PM   #4
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LOL!
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Old 13th January 2012, 12:26 AM   #5
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A guy by the username MKTheater on AVS has a couple for sale very cheap. Not cause he was unhappy with them, he just moved on to 16-18" sealed subs.
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Old 14th January 2012, 06:27 PM   #6
djk is offline djk
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If you use a block of four they are still 12dB down at 40hz with respect to 100hz.

Click the image to open in full size.

If that is what you think you want, be my guest.

http://www.xlrtechs.com/dbkeele.com/...%20vs%20DR.pdf

Evaluation of the efficiency constant for exponential horns reveals that the horn is quite wasteful in its use of enclosed volume when compared to direct-radiator systems. The main advantage of horns lies in the realizability of rather high efficiencies in the 10% to 40% range which is beyond the capabilities of most direct radiators. Use of direct radiators in arrays increases the low frequency efficiency but not without a decrease of high frequency bandwidth. The areas discussed in this paper are illustrated by comparative experimental measurements on three low frequency systems: 1) A dual driver front loaded folded horn, 2) a single driver direct radiator vented-box system, and 3) a four-driver vented-box system consisting of a 2x2 array of a single driver system of item #2.
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Old 14th January 2012, 06:33 PM   #7
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Default Isn't there another picture of these...

Quote:
Originally Posted by jbell View Post
You mean these???

they are +12db at 100hz compared to 40hz and roast hot dogs wonderfully.

Nothing wrong with them if that's what you're after.
...on fire?

Regards, Ben
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Old 14th January 2012, 06:49 PM   #8
djk is offline djk
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The bottom folded horn speakers of this stack are the EV TL5050, as described in the above JAES article by DB Keele.

Click the image to open in full size.

Look at that paint, just bubbling out of the wood !!!

Can't you just feel the heat ???
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Last edited by djk; 14th January 2012 at 06:52 PM.
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Old 14th January 2012, 07:13 PM   #9
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Dang! Now I want a hot dog.
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Old 14th January 2012, 08:36 PM   #10
jbell is offline jbell  United States
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...on fire?

Regards, Ben
embarrassed.... but no..... the only other pic is after the fire trucks left.

I think I put too much gasoline/used oil on them as my way of venting my frustration....

All I have is the burn marks, where it almost got out of control... now you know the rest of the story....
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