what are the thoughts of stand alone super tweeter

Stanwal, the Ionic tweeter or Corona or plasma, is not a supertweeter. Many come well down into the audible range. I think there is a good reason to distinguish tweeters and supertweeters. The Reference 3A Grand Veenas, have both tweeters and the Murata supertweeters.

I do entirely agree about mating plasma tweeters with other drivers. Acapella uses the plasma in every speaker above the LaCampanellas, which I own. In all but the Trilon at $160,000 this tweeter stands out as exceptional and draws your attention to it alone. This is the reason I bought the Acapellas that I did.

Sns, again I think my satisfaction with the Muratas comes from them not reproducing music. They only begin to come into play at 15K Hz.

You can find these on ebay called the ionovac by Dukane. Here in CA my city has probably more per capita then anywhere else in the USA. Five of my friends have a pair of them, one two pair. They stopped making them due the need to use certain chemicals. Me, I prefer the Maggie ribbon. But, the ionovac sounds good when set up well. jallen

I use the Radio Shacks for all my systems, including the reference system. Its very efficient, you can pad it down with a resistor.

Peter

I have been using Townshend Super Tweeter for many years and I won't pretend to know the tech mumbo jumbo behind them but I will say if you add them to your speakers you will never listen to music without them.

Tbg, the Onix came in about the same frequency, you could hear no music from it. It is not the most expensive super tweeter out there, could be some limitations that more expensive super tweeters overcome. I still suspect there may be coherence issues with any add on device to loudspeakers.