Several speakers have tweeter attenuators, among them the Magnepan 3.6s. With some speakers you can bi-amp, and then you can put small resistors in-line with the tweeter section.
Also, for 'loud' listening sessions maybe just put a washcloth or sound absorbing foam in front of your tweeter! Of course that wouldn't work on these:
http://forum.audiogon.com/cgi-bin/fr.pl?vstrt&1187479190&read&keyw&zzinfinity%20series%205
It is actually really easy to dampen high frequency noise.
You could even just use cables that tame brightness. Lots of cables can do that.
Also, for 'loud' listening sessions maybe just put a washcloth or sound absorbing foam in front of your tweeter! Of course that wouldn't work on these:
http://forum.audiogon.com/cgi-bin/fr.pl?vstrt&1187479190&read&keyw&zzinfinity%20series%205
It is actually really easy to dampen high frequency noise.
You could even just use cables that tame brightness. Lots of cables can do that.