In article ,
"Trevor Wilson" wrote:

"MINe 109" wrote in message
...
In article ,
"Carl Valle" wrote:

I have run out of opinions to share with you all
If I come up with one I may share it
Meanwhile I think I'll catch up my BBC and Stereophile reading



The beryllium dome represents a quantum advance in tweeter technology.
Agree or disagree?

**Disagree. Apart from the fact that Yamaha got them working, more than a
quarter of a Century ago, there are more interesting and potentially
superior tweeter technologies available. The ionic tweeter, for one. It's
been around since the late 1930s and potentially offers superb performance,
albeit with a whole set of 'interesting' problems. The ill-fated (but
utterly superb) HD-3P, piezo tweeter from Audax is, IMO, the best more or
less conventional tweeter on the planet. A true pulsating hemisphere (as
opposed to a piston type driver), the HD-3P is bloody good. Beryllium domes,
by comparison, are just variations on a flawed technology (ie: piston type
drivers). Damned Harman killed off the HD-3P. Typical.

Interesting. A quick google brought up Heybrook Loudspeakers as using
the HD-3P for certain models, as well as at least one heart-broken DIYer.

Stephen