True, but I have personally tested the RP-160m using an Omnimic at a distance of about 10' in a 2000 cu ft room, at 105dB, THD remained below 5% using an 80wpc Denon AVR. I can only imagine the larger variants would do even better in a larger room.
I have nothing against the Klipsch THX, I just know other speakers from them can achieve similar performance without the high price tag of the THX.
For that matter, a single KL-650 costs around $1500, a pair of b-stock RF-7 III can be found for $2500, and would completely pulverize the KL-650 into a fine paste when compared on output and headroom.
For some the THX spec insures certain requirements are met and with speakers and subs that's nice to know when there are no third party measurements are available. The Klipsch THX series for HT can be cleanly driven to reference levels and more with very low distortion.
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