I agree with Gonk - try Bypass first, in fact I don't see why any analog signal needs anything else. But why on earth are your Klipschorns in a bass-limited mode, and them good down below 35Hz? I'd run them full range; there's vanishingly little on vinyl they'd have trouble with.
I hope your turntable has a shockproof mount, preferably a wall shelf unless your floor is on a concrete slab. On the third floor of a condo building I sure need a shelf - and haven't yet got one.
I also wonder how often your all-Klipsch system uses even 5% of your amps' output capability.