Which Klipsch are you testing? I've got La Scalas and Forte II's and love both. The La Scala's certainly have the edge with a more natural, full and rounded bass. The bigger horns also do nicely at balancing out vocals and acoustics, whereas my Forte's can sound harsh in comparison. But without anything to compare directly to I'd still enjoy the sound of either (I guess that makes me one of those who'd "..love it..."). I sure hope your using them with tubes, as tubes and horns are a match made in heaven! Anyway, to your question: If you really want to challenge the 'harshness' of the horn sound on your Klipsch's try Patty Griffin, either "1000 Kisses", or "Living with Ghosts". Both are wonderful acoustic CD's and Patty's voice is powerful and remarkable, but can tend to sound quite harsh and will really test your system for weakness there. There are numerous acoustic CD's to really show off tube/horn combo. The suggestion of Eva Cassidy is a good one. I'll go out on a limb here and give you one that I bet not a lot of folks know much about: Deb Talon..."Something Burning"...like Patty Griffin a kind of folksy-blues, female vocalist with a guitar (great guitar playing, HDCD recording). Anything by Patricia Barber if you like Jazz vocals. And the list goes on! Good luck auditioning!!
