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I really miss the musical sound of a tube amp (had an old Dynaco many moons ago). I currently have a Denon AVR-3808ci feeding two Energy RC-50s. The speakers are great but the amp lacks that tube sparkle that I miss. I was thinking of biamping the RC-50s with a tube top end powering the tweeters. The crossover is at 2.4KHz and I was going to add a further crossover before the tube amp at about 1.2KHz to filter out unwanted bass from entering the tube. Since the Denon runs about 110W/ch I was thinking that a 25-30w tube should be sufficient. Has anyone experience of this sort of thing? Will the crossover point be low enough to hear that signature tube sound? Will this affect the timbre of my front plane, i.e. should I also tube the tweeter in my center channel? Anything I should note or watch out for?