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Old 8th November 2012, 05:27 AM   #431
xrk971 is online now xrk971  United States
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Squeak,
The port length required the area to be adjusted. Bjohanessen did the simulation and said to keep the port cross sectional area the same as the driver area for the longer port length. Hence the opening is 4 inch wide x 1.25 inch tall.
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Old 8th November 2012, 09:50 AM   #432
Henkjan is offline Henkjan  Netherlands
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on the posn of the port: I would advise anyone to avoid a port on the front for full range (or 2 way) because of the midrange output that will be there (incl port resonances). I had a BR with an Alpair6 with the port on the front, and imaging was not as I expected, putting some damping in front of the port did solve that
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Old 8th November 2012, 12:08 PM   #433
ide2003 is offline ide2003  Indonesia
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Default slanted TABAQ

Thank you Squeak, turns out that slanting looks like to improve staging, silly me
referring to xrk971 and upright TABAQ , which version sounds best? are there any trade off?

thanks
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Old 8th November 2012, 12:33 PM   #434
xrk971 is online now xrk971  United States
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Ide2003,
Are you asking if the Tabaqube can be slanted? It could but construction would not be simple 90 degree corners anymore. Acoustically, if you follow design guidelines of keeping cross section and path length, driver location and venting cross section and length it should all work. Angling straight Tabaq does aim sound up from rather low position if they are on floor.
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Old 8th November 2012, 12:48 PM   #435
ide2003 is offline ide2003  Indonesia
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hi Xrk971, not the tabaqube, only the tabaq, my plan is to use slanted tabaq on the sides of PC desk , I will continue with version B then, thank you
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Old 9th November 2012, 01:25 AM   #436
xrk971 is online now xrk971  United States
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I went back and reviewed older posts and noticed that Bjohanessen had simulated the Vifa TG9FD (fiber glass cone) driver with great results. I had been looking at the Vifa TC9FD (paper cone) which actually goes to 20 kHz compared to the TG which is not as high. They both have same Qts and rather substantial Xmax (2.55 mm). I think this may actually be better than the 3 in Tang Bands and they only cost $12. Would the larger xmax here compared to the TBs improve the bass response? This driver seems to be a little noticed gem. Does anyone have experience with it?
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Old 9th November 2012, 08:58 AM   #437
Henkjan is offline Henkjan  Netherlands
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I tried a similar Vifa (white, glassfibre, TG9FD-10-04) some time ago in a Needle, and was impressed, a very good driver, better low and high than the W3-871 (back then the price was $50 and imho worth it)

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Old 9th November 2012, 09:32 AM   #438
sayrum is offline sayrum  Germany
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The Vifa TG9FD is imo a great little gem! I use it in a flat/wall speaker (tml). Great neutral midrange, decent amount of high freq on axis and bass in the tml is good. For the price unbelieable value!!! So go and try them.

Vifa TG9FD tml build thread
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Old 9th November 2012, 09:50 AM   #439
xrk971 is online now xrk971  United States
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I just ordered two from Parts Express. Looking forward to hearing them in the Tabaq. Thanks for feedback. Will BSC circuit need to be changed compared to TBs?
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Old 9th November 2012, 10:31 AM   #440
xrk971 is online now xrk971  United States
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Sayrum,
My inability to read German was solved by google translate and I am glad I saw your thread on the wall speaker - very clever design and the ability to turn into a painting is perfect for my kid's room, and it has a very high WAF! I like the fact that it can be made with just a small handsaw for cutting pine strips.
Thanks for the link.
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