I have the RF-82s and other very efficient Klipsch speakers. They are so easy to drive without a lot of power to ear splitting levels that I turned on the limiter on my Onkyo to prevent hurting myself. At 99db efficient, 35 watts of power is 114db of sound pressure at one meter. Way overkill. The Heresy is only rated to 100 watts isn't it. If you ever put 100 watts to it, you will likely regret it. Many other speaker companies need to drive their units with massive power to allow the speaker to produce the same sound that Klipsch does at a fraction of the power.