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-   -   Tiny Vifa tweeter question (http://www.diyaudio.com/forums/pass-labs/164095-tiny-vifa-tweeter-question.html)

Decker 29th March 2010 08:21 PM

Tiny Vifa tweeter question
 
Anybody know the Fs of the little Vifa TW 269A tweeter that Mr. Pass was giving away at the Burning Amp festival 2 years ago? I have been scouring the Web, and found that it has a 6 ohm impedance, but couldn't find any other data.

vdi_nenna 29th March 2010 08:33 PM

Wt3
 
Do you know anyone with a WT3 (woofer tester) from partsexpress? I think it can test tweeters also. I'll run a tweeter thru mine tonight and see if it is close to manufacture's spec. Great tool for $100.

Nelson Pass 30th March 2010 04:27 AM

It was a clearance part out of Parts Express a few years ago,
so I bought 1,000. Clearly made for auto sound application,
it has about 86-87 dB sensitivity and I use it at 10 KHz and
above with Pioneer Bu20F20 full ranges to sweeten the top.

They also make for party favors at BAF.

:cool:

vdi_nenna 30th March 2010 03:12 PM

If it's a 1" tweeter, it's a safe bet to keep the crossover point above 2k and higher if it is smaller. Some 6 Ohm can go a bit lower, like 1800Hz.

This is the discontinued line at Tymphany: Vifa | Tymphany
They have picture. Maybe you can spot your tweeter here.

Good luck

Decker 30th March 2010 04:17 PM

I'm going to try them with a LR 2nd order crossover at 3500 hz with a Pioneer B20. I'm putting these in a pair of old Allison 7 boxes. The woofer is mounted on top facing up. The tweeter is mounted on an L shaped piece of pipe over the middle of the woofer. Kind of like the speakers demonstrated by Mr. Linkwitz at the last Burning Amp festival in Sausalito. Everything except the crossover is done. Will report back after I get them running.

Decker 30th March 2010 11:14 PM

Ooops! I just noticed that Mr. Pass said [I]86-87[I] db efficiency, not 96-97. I thought that they were approximately the same sensitivity as the Pioneer woofers. Back to the drawing board!

woody 31st March 2010 08:25 PM

The Pioneer Bu20f20 is 90 db.

Decker 31st March 2010 08:38 PM

Seriously? The Parts Express catalog (where I bought them) lists them as 94 db1W/1m. Now I'm all confused. :(

woody 31st March 2010 10:53 PM

Which model did you get. There is a B20gr30-51F, B20fu20-51F and B20FU20-51FW
Seems they wanted that to get confusing! By the way the one with the 93db sensitivity only goes up to 2.5k.

Nelson Pass 31st March 2010 11:52 PM

I have measured them as 91, but this is in the region of
300 Hz to 1 KHz. Most FR\'s bounce around above this
region, although the Pioneer declines rather gently. At
10 KHz or so it\'s a pretty good match with a 1 uF cap. Not
very bright - just a little sugar on top.

:cool:


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