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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
akwilson501 OP
50 posts
 
Thanks for the response Duke. Do you suggest I throw in a resistor or two to help attenuate the volume, or some kind of Lpad? I'm guessing the T90As will be significantly louder than the Audio Nirvanas due to there higher sensitivity. 
mijostyn's avatar
mijostyn
8,224 posts
 
ak, I would try without first but if they run too hot then yes but you want to put it in front of the capacitor or you will change your cross over point.
mijostyn's avatar
mijostyn
8,224 posts
 
Oh, I would adjust the L pad to suit then measure it's resistance. I would get a matching 10 watt resister and wire that in permanently.
cedargrover
302 posts
 
Those are nice full range drivers and you have a good amount invested in them. If it were me I would consider getting something like the Dayton Omnimic system to test your design.  Danny at GR Research did a video on adding a super tweeter to a full range and was of the view that there are often phase issues that cause unpredictable response unless you test and compensate. 
jdal
157 posts
 
My Bache Audio Tribeca’s use the Fostex FT96 EX-2 tweeter with a modified Tang Band wide band driver. I believe it’s crossed over around 8K. It’s a great sounding tweeter. You may get good results aiming it at the ceiling. Another option would be to aim it straight ahead into the room. Assuming that the Audio Nirvana drivers are positioned with some toe-in.
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