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Old 9th November 2012, 02:10 PM   #441
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally Posted by xrk971 View Post
Will BSC circuit need to be changed compared to TBs?
probably.... try the one for the Picolino2 as starting point

PS: made a mistake on the type nr of the one I had, that was the 9BGS 119/8
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Old 9th November 2012, 02:28 PM   #442
Havoc08 is offline Havoc08  Denmark
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Quote:
Originally Posted by xrk971 View Post
BJohannesen,
I think that corners in MJK's worksheets are implemented as area changes due to cos(theta) effect (see MJK's tutorial at on page 16, http://www.quarter-wave.com/Back_Doo...al_7_03_09.pdf ). When the transmission line is stretched out, it looks like a series of expansions and contractions - and this makes sense that they will serve as low-pass filters. This may be the reason why many back-loaded horn designs work better with lots of 90 degree labyrinth turns rather than smooth curved turns.
Thanks for your great design which has led me to these concepts.
xrk971
So If I fold it, it it better to just fold it and keep the gap at the correct dimensions instead of putting in a curve that keeps the area the same all around the bend?
Not putting in a piece would make the area bigger at the bend where the bend meets the corner (the area around 45 degrees from spacer tip to corner) no?
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Old 9th November 2012, 02:33 PM   #443
Havoc08 is offline Havoc08  Denmark
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nvm. Just saw bobs reply. Uneven area it is
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Old 9th November 2012, 05:17 PM   #444
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Hi xrk791

BSC is 1.8 Ω and 0.5 mH

Take a look at

http://www.coolcat.dk/bjoern/VIFA_3.5_Full_Range.pdf

Hi from
Bjorn
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Old 9th November 2012, 05:24 PM   #445
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Hi Henkjan,

about having the port in the front: Sfuffing should take care of the unwanted output.

What I have learned from using MJK´s models is to keep the opening at the front and as close to the driver as possible.

Hi from
Bjorn
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Old 12th November 2012, 02:41 AM   #446
jhutka is offline jhutka  United States
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Default Thanks Bjorn

These are some TABAQS I made for a friend. A little darker finish than I would like, but the sound is great. Perfect size for a computer speaker system and with the Vifa 10-04 they are easily driven by a small Class T amp. Ready to make my own now.

Bjorn, I consider these a triple threat:

1. Easy design.
2. Sound great.
3. Very affordable.

Great job.
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Old 12th November 2012, 04:15 PM   #447
xrk971 is offline xrk971  United States
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Jhutka,
Very nice job! I am still waiting for my Viva TC9D's to arrive. I plan to drive with a T amp also. How do you like the sound of the vents going up? In the meantime I am trying out my micro Tabaqube design using foam core paperboard with a 1 inch driver, looks like a little desktop PC speaker at 4x4x9 in. I will post photos soon.
Xrk971
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Old 12th November 2012, 05:37 PM   #448
jhutka is offline jhutka  United States
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Vents up, about 3 inches from the wall sounded perfect for me. Very interested in your cube design. Please take pictures.
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Old 12th November 2012, 05:59 PM   #449
Squeak is offline Squeak  Denmark
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Quote:
Originally Posted by jhutka View Post
These are some TABAQS I made for a friend. A little darker finish than I would like, but the sound is great. Perfect size for a computer speaker system and with the Vifa 10-04 they are easily driven by a small Class T amp. Ready to make my own now.
Very good! but wouldn't they look even better with copper colour screws?
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Old 12th November 2012, 08:14 PM   #450
xrk971 is offline xrk971  United States
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Default Micro TABAQUBE MP3 Player/Speaker

I built a micro Tabaqube with a 36 in pathlength (4 x 9 in) and 4 square inch cross sectional area to use with a 1 in driver from a small MP3 speaker/player. These player I have utilizes an LM4871 3-watt (mono) amplifier and also contains a microSD mp3 player, a rechargeable Li-ion battery, and a 3.5mm jack for connecting your external sound source (iPod). I wanted to make it small and portable, and I wanted to make fast and cheap. So I ended up using the foamcore paper board (poster backing) as the speaker housing material. You can make this in a hour with just an X-Acto knife, a ruler, and a hot melt glue gun. Anyhow, I made each quadrant have a 2 in x 2 in cross section, and there are 6 turns to the TABAQ - basically it looks like the 3d transparent drawing from my earlier post for the TABAQUBE but looks stretched out since the footprint is only 4 in x 4 in instead of 9.5 in x 9.5 in. I stuffed it pretty tightly with polyster fill from an old pillow per Bjohanessen's recommendation of about 2/3 the length from the closed end. I put some wire inside before sealing the unit off with glue on the top lid. For the vent dimensions, I was not sure how big to make it because this is so far from the parameters of the original TABAQ, so I made provisions for having an adjustable slot width by adding more foamcore inserts to tune the sound.
For the mp3 player, do a search for "hamburger mp3 player". I found one for about $9 and they have quite an amazingly powerful sound for how small they are. However, the bass is really non-existent as you would imagine for a speaker without a real enclosure. The bass could really be improved from the standpoint of an mp3 speaker with full-range sound which is why I took on this project. I took the hamburger player apart and separated the speaker and trimmed off some excess plastic and mounted that on the front with hot melt glue. Then I hot melt glued the back half of the hamburger on the back of the micro Tabaqube so that the 3.5 mm jack could go to the top where my iPOD nano would sit. The electronics half of the hamburger is really impressive for what can be done with $9. There is the microSD card slot, the mp3 player IC, the 3 watt amp, Li-ion battery pack, charging circuit, LED's and track and volume controls, and mini USB charging jack.
So how does it sound? Very nice for something that costs less than $10 and weighs less than 5 ozs including speaker cabinet! The bass is now present in good quantities, whereas it was completely missing before. The player is actually too loud to comfortably listen to if it is on your desk at full volume - I turn it down to maybe 60%. It sounds better than most portable mp3 players I have heard in the $30 to $50 price range, albeit, it is only mono. But that is OK as I use it mostly for background music while doing stuff around the house. It was a lot of fun to build and I am a true believer in DIY mass loaded transmission lines to make speakers full and rich.
Thank you to Bjohanessen for inspiring me to do this! Now that I have done it in foamboard, I have a good idea what I need to do to make the wooden cabinets for my Vifa TC9D's when they show up. I will make a stereo side-by-side TABAQ powered by a TA2020 amp. Although, I am also tempted to make a picture stereo transmission line, maybe I need to order more drivers???
Regards,
xrk971

Photos show the Tabaqube internal baffles, assembled with stuffing, 1 in driver on front, the electronics on back, and with an iPOD nano which fits perfectly on the top.
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