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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

Showing 5 responses by mijostyn

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.
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
 
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. 
mijostyn's avatar
mijostyn
8,224 posts
 
George, you would be the guy to buy Hill Plasmatronics. Mesmerized by the purple light. Turn on that gas!
mijostyn's avatar
mijostyn
8,224 posts
 
Those tweeters are banned from import to the US. Ozone factories. The Hills avoided this by using Helium to create the plasma. Thus my comment about the gas. The Hills were awful by the way. I helped set a demo pair up. Must have been 1978 or so. The plasma tweeter worked fine if you like point source speakers but the rest of the speaker was terrible not to mention having huge helium tanks and being butt ugly. They did not last long.
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