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
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
Attachments
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
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
Attachments
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..
Attachments
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/showthread.php?postid=620682#post620682
Does the line tuned much lower than the driver Fs really have that good a response or does it create ripples?
ensen.
http://www.diyaudio.com/forums/showthread.php?postid=620682#post620682
Does the line tuned much lower than the driver Fs really have that good a response or does it create ripples?
ensen.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/images/picolino2.jpg
http://www.lautsprechershop.de/hifi/images/picolino2.jpg
purplepeople said: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/showthread.php?postid=620682#post620682
Does the line tuned much lower than the driver Fs really have that good a response or does it create ripples?
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
you can see the sim in the opening post... flat enough for ya ?purplepeople said:
the combination of a strong taper and the stuffed closed end does the trick.I think this basis (~1:10 taper and 80-85cm line length, lots of stuffing in the closed end) might work with other TB drivers as well. but I expect you'll want to change the BSC somewhat.
also with the box upright, the BSC will be slightly different (I suggest to use the one for the Needle with the BB3.01 (0.56mH, 5.6 ohm, 5.6uF) in that case, BSC for the Ct222 is 0.39mH, 10uF, 5.6ohm)
the BB3.01 is a polyprop cone wide range made by TB for Blue Planet Accoustics, so availability is limited to germany and the surrounding countries. unless you don't mind paying 22 euro's for shipping them to Australia... (just PM me if you want a pair, they are very fine FR drivers, almost as good as the Vifa's for just over half the price, and 4 ohm)
Henkjan said:
Interesting... I had an idea for a 2.1 system using an autosound coaxial, but now with the lower response from the aggressive taper, it looks like I might be able to leave out the single woofer.
gychang said:
I don't know how the speakers are set up now. When I left Vancouver, I gave them to my cousin who is an audio engineer with one of the local multimedia technical schools there.
When I had them, I used with my office computer. The forward port is because there are no wall in the open plan office. The low port allows some LF reinforcement from the desk surface. The amplifier was ripped out from some old PC speakers that were going to be discarded by someone else.
The line is about 23 inches long with 3:1 taper as per the MJK alignment tables. There is no BSC. Instead I used the Media Player equalizer to attenuate everything from >1 kHz by 6dB. The 1kHz slider was set to -3dB and all the lower were set to 0dB. It's actually really effective. When I really wanted to impress the colleagues, I would turn up the SRS TruBass for that fake sub effect.
The project was designed to be really cheap. It uses common pine dimensional lumber from the home improvement store. The sides cut from are 1x10 (19mm x 240mm). Front, back and all the interior panels are 1x4 (19mm x 90mm). Approx 40 drywall screws and no glue since it is small and the multiple panels make it very rigid. The stuffing is polyester blanket I found at the dollar store and fills from the closed end past the driver to the back. The last 1/3 of the line is free air.
My cousin almost cannot believe that I made them from cheap wood, cheap screws and a $1 blanket. Morever, the drivers were purchased at a discount for about $15 each. I'd say the total cost was just under $50.
I'll dig around and see if I still have the 3D model. If I can find it, I'll add some dimensions and re-post it for you.
ensen.
Sorry to bring up an old thread, but I just got a pair of the TB W3-593's for a desktop speaker project for a friend. This box looks like a simple, small-ish solution!
I'd like to possibly change the shape of the box, possibly making something curvier. What basic guidelines should this cab novice follow?
Thanks- Kent
I'd like to possibly change the shape of the box, possibly making something curvier. What basic guidelines should this cab novice follow?
Thanks- Kent
http://homepage.mac.com/planet10/TLS/projects/sampson/images/Babysnake_strike.jpg
This guy has a number of projects using PVC. I suppose it depends on how adventurous the design would be and for whom it's being built. These are just fun and would create conversation as computer speakers etc.
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