opinions on the new VIFA dual conc. tweeter XT25 - diyAudio
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Old 10th January 2002, 09:07 PM   #1
grataku is offline grataku  United States
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Default opinions on the new VIFA dual conc. tweeter XT25

Has anyone played around with this revolutionary-looking tweeter?
It's a 4 ohm nominal impedance.
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Old 10th January 2002, 11:14 PM   #2
Super is offline Super  United States
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Haven't played around with it personally, but its used in the Audio Physic Avanti III...
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Old 11th January 2002, 12:56 AM   #3
BAM is offline BAM
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Default MTM

Maybe they have a 4-ohm impedance for MTM's so that the speaker will present an even 4-ohm load to a reciever or power amplifier.
The Dayton silk dome is more in my price range.
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Old 11th January 2002, 01:52 AM   #4
Will is offline Will  Malaysia
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Grataku,

Can you please attach a web link to the particular VIFA driver ? I'm quite interested to get a concentric driver myself. Thanks.

Will.
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Old 11th January 2002, 02:32 AM   #5
PJ is offline PJ
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For the Vifa:

http://www.d-s-t.com/vifa/data/xt25tg30-04a.htm

And the new Scanspeak...this is seriously expensive, I'm heard around $US1000 each!

http://www.d-s-t.com/scs/data/d2904_700000a.htm

Wouldnt mind using that tweeter, together with the new revelator 6.5" midwoofer
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Old 16th January 2002, 02:59 PM   #6
hifi is offline hifi  Sweden
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It is in the same price category as the normal 9700...i will order some for evaluation shortly....

/micke
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Old 17th January 2002, 05:05 PM   #7
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Is this new Scanspeak tweeter available yet ,who from and how much?

Thanks

Woody
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Old 14th February 2002, 02:22 AM   #8
ucla88 is offline ucla88  Tahiti
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just bumping this up to see if anyone has tried out this driver to see what they think.
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Old 19th March 2002, 09:59 PM   #9
Thomas is offline Thomas  Denmark
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Hi!

The local vifa dealer in my town sells a "kit" including the XT25 and rest of the parts for a nice 2-way speaker. My dad bourght it and are in the process of building the cabinets. For what I can tell the crossover network suggested is quite complicated. It's a -24 dB containing three coils, two 68uF caps plus some more. I was by the store today asking for a datasheet on some other drivers and mentioned the XT25 crossover. He told me the complex network is "necessary to get it going"...

Later this week i will upgrade my own speakers (D27tg tweeter) with the XT25 and will be able to tell more at that time.

Btw. they cost 400 Dkr. (47US$) a piece.
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Old 19th March 2002, 10:23 PM   #10
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Default Yea I've had a pair for several months now...

They are quite good on detail but they have a nasty resonate peak and are difficult to integrate with the mid’s, the low FS of 500hz suggests that it will work well in a MTM which I am using along with a pair of SS 8530-K00 Mid woofers and a Marchand Active 24db L-R crossover. Right now (actually tonight) I'm adding a conjugate network to the XT per the suggestion of Peter at Acoustic Reality (he has a lot of experience with this tweeter) to remove the resonate peak, a simple .1mh in parallel and a 4 to 8 ohm 20W resistor in series in conjunction with the active network should help according to Peter. I'll post my listening evaluation later this week if anyone’s interested, also I'll try posting pictures of my SST8 DIY MTM's that use these drivers, quite a unconventional design that some might be interested in being a dual tapered octagon with separate tilting mid enclosures and a telescoping tweeter mount for time alignment.
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