Piano and Trumpet can sound bright


SYSTEM:
SPEAKERS...Celestion SL700SE
AMPS...Quicksilver tube 90 watt silver monos
PREAMP...Quicksilver tube LS non-remote...new model
Theta Miles CD Player
CABLES... Kimber 8tc/8tc bi-wire (speakers), Kimber kcag and silverstreak (interconnect).

Any thoughts?... to loud, artist style (Red Garland, Miles Davis), aluminum tweeters, cables, room acoustics
zoot45
Kimbers are great cables.....but then can be a bit forward, particularly the silver streaks. Substite a cable or two.. It should fix the problem.
Some of that zip may be diffraction from tweeter off the front baffle. You might try a large ring of 1/4" felt around the dome. This will slightly pad down the tweeter while improving coherance.
If you're up for a speaker change, you could certainly change that quality in the sound. However, you'll change pretty much everything else too. I'd try replacing the silver streaks with something that's all copper - there are tons of options.
I hear live trumpets often at the local jazz venues. Yes at times they can be bright but never are they irritating or harsh.they don`t lose their inate beauty of tone.