I need SPECIFIC super-tweeter!...Help...

[planet10]

Originally posted by Brett
Last is the <a href="http://www.stageaccompany.com/cdload.html">Stage Accompany SA8535</a> . And if you thought the TADs were expensive.....be sitting down. But it only does about 30kHz. Love that 108 dB efficiency though.

IIRC the SA with that efficiency has the wave-guide (they don't call it a horn) and gets a bit lumpy. The direct radiator version is quite superb, very robust (1 k XO minimum), and as far as hi-end ribbons go, not all that pricey (something like just over a $1k for a pr last i checked -- 2 yrs ago thou)

dave

[Brett]

Originally posted by planet10


IIRC the SA with that efficiency has the wave-guide (they don't call it a horn) and gets a bit lumpy. The direct radiator version is quite superb, very robust (1 k XO minimum), and as far as hi-end ribbons go, not all that pricey (something like just over a $1k for a pr last i checked -- 2 yrs ago thou)

dave

If they're $1k/pair that's quite a bit cheaper than I was told. My source in the US said approx the same price per unit as TAD4001's, ie about $US1700 each.

I've also heard they're excellent, though I haven't heard them myself. Have you? If I was in the market for this sort of device, I think I'd splash for the TAD if I was buying blind. I've not heard a bad one yet.

I wonder how the SA's would sound on a properly designed and built tractrix.

Cheers

[phase_accurate]

SA compact driver

I was once able to listen to an SA studio monitor in an active setup and can confirm that this is an excellent tweeter.

But I assume that "nar" is basically lucky with what he has at the moment (ernn't you) and likes to keep it but give it some extension above the working range of his HF horns. In this case I wouldnt go for the SA driver because one would never take full advantage of it's potential when used as a supertweeter since it can be used for the HF - range in a two-way speaker that is crossed over fairly low.

I guess it is better to HAVE the higher frequency range at all than having a really flat frequency response so maybe some cheaper ribbon with just alittle more than 90 dB efficiency would be a good fit.

Regards

Charles

[nar]

The problem is the filter is going to be a passive one,not active Xover so I need a REAL 97 dB/W/m for HF.The crossover frequency will be at 8kHz or 10kHz or 12kHz worst case,so I really need a directivity pattern at this crossover frq.which is the same as the horn for medium/treble 1' driver.
By the way it is a DE25 from B&C,but highly modified

The directivity pattern required is real 40°V x 90°H!!!!Damn it...
Or otherwise the extreme highs will not be focused.I really don't like to hear "so appart treble" strange things,as my aim is not to hear them but FEEL them.

The slope will be mostly a 6dB/oct phase linear,more or less.This is to give the most gentle translation between high of the 1' and the super tweeter.

My last idea is to buy some Fostex FT 17H to dismantle them,get rid of the conic thing and exponential horn,then to add a DIY horn which will have same pattern as the big one.

Any feedback welcome.In fact I really need it!!!So don't hesitate giving your personal opinions

Regards

Anael

[planet10]

Originally posted by nar
My last idea is to buy some Fostex FT 17H to dismantle them,get rid of the conic thing and exponential horn,then to add a DIY horn which will have same pattern as the big one.

That sounds like a good plan to me. You can then optimize the horn for your application. It won't be too big so shouldn't be too hard to fabricate.

dave

[Brett]

Anael,

I agree the FT17H is the best option. However before pulling it apart and modifying it, install it and try it as is. Then maybe use some small shaped felt blocks to reduce the vertical directivity. Minimal cost and a little time to test.

I still don't think you'll need control of the vertical directivity to the extent you do, unless you need to focus the energy for a PA stack. This is my own experience, as well as others more expert than me. I've seen comments by Bruce Edgar and Tom Danley saying much the same thing.

As for modding the FT 17H. I'm holding one in my hand now, and the flare looks to be exponential, and you'll probably need to incorporate a phase plug (the 'conic thing') or you won't get the same HF response out of the driver.

Cheers
Brett