Despise conventional dome tweeters

A lot has to do with driver integration. Tweeters are really very simple and very easy and cheap to make and they perform better than every other driver.

If you notice the tweeter at all then it is a bad speaker design (very common).

A good design (rare) will not sound like two or three drivers coupled together - it will just sound like music.

Lonestarsouth,

I had B&W P6s for years. You're right, the tweets did disappear nicely. I suspect though this had more to do with the voicing (overall tonal balance) of that particular speaker and how it played in your specific system more so than the tweeter itself.

You're probably getting a somewhat brighter tonal balance with your current Quads in the same system compared to the P6s I suspect.

Short of changing speakers (those Quads are fine speakers IMHO) you might be able to get the sound you're looking for out of the Quad 21Ls with different interconnects perhaps first.

You might try DNM Reson interconnects, which are not too expensive. These ICs are very British, refined and mellow sounding on the top end. When I use them in my system the sound reminds me greatly of the highly unobjectionable top end of the P6s when I owned those.

You might like to try the Mirage OMD-28. I really like the Mirage tweeter. It's a pure titanium dome with a cloth surround. The titanium makes the dome very light, rigid, and fast while the cloth surround damps out any ringing.

The OMD-28 and OMD-15 floorstanders both use their Omniguide, which turns the radiation pattern into a slightly forward-firing hemisphere. It has wonderful dispersion, which--along with a well-designed crossover--eliminates any nasality.