I own a pair of Forte IIIs, unmodified, and I've found best pairing for high efficiency Klipsch IMO are low power SET or SEP amps of high quality build. My Forte III's sound simply magical paired with a Dennis Had Inspire KT88 whether I run 6550s, EL34s, 6L6s or KT88s. Dennis built my KT88 with a volume pot so I don't need a preamp or have to use other gain control elements. A wired or wireless streamer (I run a Cambridge Audio CXN V2 with "warmer" dual Wolfson DACs) straight to the Inspire amp and on to the Klipsch Forte IIIs. It's a simple, yet wonderful sounding way to access tons of HiRes tracks that sound superb. And yes, experiment with speaker placement, toe-in, etc. to find your sweet spot. You'll enjoy ever minute of musical paradise!
