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Super tweeter for FullRange Driver

I have a pair of Audio Nirvana 15in Alinco Classics that I just got done getting into cabinets. After some listening impressions, I've realized I cant live with the high frequency response these things put out by themselves. They only go to about 15k hz. and it's made music lose its sparkle and sense of space and spacial cues. I was thinking of buying a pair of Fostek T90As and pointing them at the ceiling for a more even dispersion and better integration with the Audio Nirvana driver. My main question is what  capacitor volume would you suggest? Where in the frequency response would you crossover to the tweeter? Would wiring the 8ohm tweeter and the 8ohm Audio Nirvana in parallel make me need to change my amp(Audio Note Kit 1 300b Set) from 8ohm to 4ohms? Any other brands of tweeters recommended for a fullrange driver that is around 96bd efficent? Sorry for all the questions, incredibly new to trying to implement crossovers with full rangers. If this sounds like a bad idea. Please speak up. 
akwilson501
georgehifi's avatar
georgehifi
10,312 posts
 
akwilson501
After some listening impressions, I’ve realized I cant live with the high frequency response these things put out by themselves. They only go to about 15k hz. and it’s made music lose its sparkle and sense of space and spacial cues.

If you want the very best. Get a pair of these Plasma tweeters that I’ve got, no mass. Highs just dance in front of you like firefly’s. They’ll sit on top of your Audio Nirvana Classics and look the part too.

Adjustable level, and can go down to 5khz and reach up to a staggering 100khz!!!!!.
https://www.ebay.com.au/itm/Magnat-Plasma-MP-02-ion-tweeter-massless-air-plasma-speaker-Plasmahochtoner/282700838884?hash=item41d24877e4:g:yJkAAOSwTmtZ6PwI
He's dreaming on the price, I'd ask around $2.5k for mine.
Cheers George

bache's avatar
bache
502 posts
 
$10000 for pair
bache's avatar
bache
502 posts
 
This discussion remain me how is different the taste,  i dont want to tell the famous brands on the market now which use one full range driver
with double cones  , main cone and whizzer, which play a tweeter-super tweeter role, and say the sound is beatifically, Conclusion-   some like piece a paper as supertweeter , some need plazma . sorry for my english 
alexberger
854 posts
 
My speakers Altec 604E. These speakers have high frequency extension just up to 12KHz.
I did experiments with back of ceiling firing tweeters. I used Morel MDT30 tweeters with 1st order filter. The effect of  back of ceiling firing was like a saliva of singers where scattered around the room.
Then I used  Morel MDT30  in forward  firing way. I adjusted the phase by moving tweeters back and forward. Even 1mm makes a difference because at 10KHz the wave length is 340mm.
After that, I used Dick Sequerra Pyramid T9 ribbon super twitters.
A couple years ago, I started use a better parts in crossover and Duelund hook up wires. As result, I can use speakers without supertweeters at all with still good tonal balance.
Now I started using T90a. T90a suted much better to Altecs 604E. They give a huge positive effect. I use auto-transformer (-7.5dB tap). This solution is most SET amp friendly. The extra load of addition supertweeters loaded thought the auto-transformer is very mild.
Regards,
Alex.

mijostyn's avatar
mijostyn
8,175 posts
 
Duke, I think the L pad or resistor goes in series in front of the capacitor and driver. No?
Ribbon tweeters are mini line sources. They do not send energy up or down. In other words their vertical dispersion stinks. Their horizontal dispersion depends on the width of the driver. The narrower it is the greater is the horizontal dispersion. I would think these characteristics would make a ribbon tweeter excellent for an ambient driver. In thinking about it I would aim it at the opposite side wall just in front of the listening position. This would send the sound off the side wall into the rear wall then on to the opposite side wall before getting to the listener, the longest path. 
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