@ckenr,
It appears at least 2 different Concerto models existed, each had different drivers in them. The later model has a diffraction device on the tweeter as one indicator, and look closely at the woofers. This original model reviewed way back was rated at 86/db at 8ohms, and yet the other version showed 88db at 6ohms. Old review here, https://www.technologyfactory.com/reviews/SonusFaber/concerto_stereophile.pdf
Agree, its likely going to take a capable amplifier (tube or SS) for these speakers to get proper performance out of them - as your tech and others have already noted. The Tech Factory review above noted these like a clean 100w amp, capable of peaks up to 250w; betting that was a solid state amp too. I like and use tube amps, and in this case, if I kept the Concertos, it would mostly likely be paired with a really nice sounding solid state amp. You could find a number of nice integrated solid state amps in your noted price range. Or, if you must go tube, maybe others speakers as many here suggested.
Is there a label on the back indicating 6 or 8 ohms? Does it have the smaller soft dome tweeter or the version with the diffraction 3-point star diffraction device on the front of the tweeters?
It appears at least 2 different Concerto models existed, each had different drivers in them. The later model has a diffraction device on the tweeter as one indicator, and look closely at the woofers. This original model reviewed way back was rated at 86/db at 8ohms, and yet the other version showed 88db at 6ohms. Old review here, https://www.technologyfactory.com/reviews/SonusFaber/concerto_stereophile.pdf
Agree, its likely going to take a capable amplifier (tube or SS) for these speakers to get proper performance out of them - as your tech and others have already noted. The Tech Factory review above noted these like a clean 100w amp, capable of peaks up to 250w; betting that was a solid state amp too. I like and use tube amps, and in this case, if I kept the Concertos, it would mostly likely be paired with a really nice sounding solid state amp. You could find a number of nice integrated solid state amps in your noted price range. Or, if you must go tube, maybe others speakers as many here suggested.
Is there a label on the back indicating 6 or 8 ohms? Does it have the smaller soft dome tweeter or the version with the diffraction 3-point star diffraction device on the front of the tweeters?