Just bought a used Onkyo TX-SR805. I have a pair of Klipsch KG 5.5 tower speakers. I bought the receiver because I wanted more power for the big Klipschs. This receiver is rated 130 watts continuous,8 ohm from 20Hz to 20kHz with a THD of 0.05. Somehow I can't get these to crank. I figured with this receiver I wouldn't be able to get past half volume. Instead I go max volume and get loud, but not earthshaking you would expect from 130 watts. Any ideas?