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-   -   desktop TL with 3" driver (with real bass) (http://www.diyaudio.com/forums/full-range/124449-desktop-tl-3-driver-real-bass.html)

Henkjan 7th June 2008 09:25 AM

desktop TL with 3" driver (with real bass)
 
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I already mentioned it in another thread: I just completed a pair of desktop TL's using the Omnes Audio BB3.01 (is Tangband built designed by BPA).

I had a few starting points for the design:
- same baffle as the CT222 (a small BR with this driver)
- real bass
- easy to build

so I started the design using the allignment tables from MJK (weidok and I made a nice excel sheet that automates this) and the allignment from that (a 1:10 taper, driver at 1/3 of the line, tuning 55Hz) was the starting point for the Mathcad sheets. the 'driver offset' sheet gave very promissing results, so I made a sketch, and entered that into the sections sheet. just some tweeking and the results were imho excelent. I optimised the stuffing so I could use 1 sheet of Sonofil for each box

Henkjan 7th June 2008 09:35 AM

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so, building it was fairly easy, just the normal 6 pieces + 1 extra... I applied the same notch filter as for the original BB3.01, so I could do without measurements this time, and soon I could start listening...

I wa stunned. the bass was amazing, most I have heard from this size of driver ever. (in a larger room the bass is somewhat less I found out later) even percussions sounds good, a accoustic bass sounds like a big instrument, etc.

I decided to do a combination of vineer and paint for the exterior to finnish them off, se the photo

Henkjan 7th June 2008 09:38 AM

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on the stuffing: most of it goes into the closed end. the area around the driver remains empty, and only some 4 grams go into the open end. bass output is rather sensiive for the stuffing in the open end, so if you experiment use small changes...

Henkjan 7th June 2008 09:43 AM

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the sketch

Henkjan 7th June 2008 09:47 AM

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a drawback of this design is that it will not fit every desktop, due to the large depth.... so why not flip it on it's end and move the driver a bit... this results in a 40cm tall and only 22cm deep box. would fit nicely next to any decent sized LCD screen or TV... so I modified the mathcad sections sheet, and the results were very similar to the original.. just a dB or so in the ripple, nothing more..

Dr_EM 7th June 2008 10:38 AM

Very nice looking design! Very impressive results too :cool:

tilroh 7th June 2008 11:29 AM

I feel I have to build a pair of your desktop TLs but Googleing "Omnes Audio BB3.01" in Australia show no hits and worldwide returns no hits in english.

Can you suggest other drivers or a place to order the O A BB3.01s.

Thanks!
Mack

purplepeople 7th June 2008 11:34 AM

I tried something similar for my own desktop about 3 years ago. It was tuned to 100 Hz to match the Tangband driver.

http://www.diyaudio.com/forums/showt...682#post620682

Does the line tuned much lower than the driver Fs really have that good a response or does it create ripples?

:)ensen.

billman 7th June 2008 11:45 AM

Hi, I am about to built the PicoLino 2 TL with Vifa 9 cm Driver. I will post results the next 2 weeks.

http://www.lautsprechershop.de/hifi/.../picolino2.jpg

gychang 7th June 2008 01:29 PM

Quote:

Originally posted by purplepeople
I tried something similar for my own desktop about 3 years ago. It was tuned to 100 Hz to match the Tangband driver.

http://www.diyaudio.com/forums/showt...682#post620682

Does the line tuned much lower than the driver Fs really have that good a response or does it create ripples?

:)ensen.


I have the same driver TB W3-593 looking for a small cabinet with some bass, details on your build will be appreciated if the sound was good.

gychang


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