"Sizzling" tweeters at high volume?


I have my new SFC-1 tube amp (Svetlana El34) 50wpc. my speakers are ACI Sapphire II (Focal TK-120 kevlar tweeters)rated 15-150wpc, 90db with imp. of 6ohm. On some recordings (Live at the Greek, Tim Haggans...)snare drums, and trumpet would start to "crackle", at volume level past 12 o'clock. On other CD's it doesn't(Kind of Blue)
eldragon
Good luck with the new speakers Sedond! I presume when you say Accuton drivers, you mean the ceramic(Al2O3, aka alumina) coned tweeters and/or midranges? If this is so, I think you are fortunate. I have heard(second hand) that these drivers are quite special. Used to see them a lot in the speaker parts catalogs I read(when I was "active" in the hobby), when they first came out. Were originally called Ceratec, then had to switch name to Accuton(or vice versa?), due to another company having dibs on the name. Lately, I have read a review of Kharma speakers(which I am under the impression use these drivers), and it was positively glowing. Supposedly very laid back and liquid, yet fully detailed. Please keep us informed of your reaction to the new speakers. Thanks
trelja,

the newform's have ribbons from 1khz up; below 1khz, they currently run the scan-speak revelator mid-woofs, either 5.5" or 6.5", depending on the model. ya, the accuton mid-woofs would replace the scan-speaks - also excellent drivers in their own right. but, i have to believe that the accutons, which are a couple of orders of magnatude faster than the scan-speaks, would mate w/the ribbons even *better* than the scan-speaks. and yes, the kharmas, which *have* gotten good press lately, *do* use the accuton glass drivers.

regards, doug

Best of luck with your new speakers Sedond. Please let us know of your impressions during and after break in. Joe.