Onix Extended Response Tweeters?

[ExtraCheese]

I was surfing av123.com and I saw Extended Response Tweeters listed for $350.00 / pair. Anyone know anything about these?

I have a pair of Dynaudio 72 SEs as my mains. I chose them over many other brands because I knew I could listen to them for hours with zero fatigue (auditioned at stores, not in home).

When I brought them home I found them to be silky smooth in the highs and amazing in the mids but the the higher frequencies seem to be excessively rolled off. Potentially this is due to the room acoustics or electroincs that I'm using.

Here's my equipment:
Dynaudio 72 SE
Denon 3805
Behringer A500 AMP


Side Question: I'm gonna get a SPL Meter, but I've read that they are inaccurate in the higher freq range. Is it difficult to use an SPL Meter to try to diagnose this sort of problem?

Any suggestions or help would be greatly appreciated.

Thanks,
Naoki

 

[ExtraCheese]

Quick follow up:
Just realized that av123.com has a forum and tons of posts regarding the ERTs.

I'm still insterested in hearing ppl's opinions on the ERT and using a SPL to diagnose high freq roll off issues. Thanks!

 

[MacManNM]

Just pick up a decent eq and taylor the system a bit. Buckeye did it with his 3806, and polk mains. He is very happy with the results.