Sideswiper,
If you are looking at the $1500.00ish price bracket, may I suggest the NAD C375BEE or C375BEE DAC. Either will have no trouble at all driving those four 10 inch woofers and opening up the rest of the range. I think the NAD sound and Klipsch Reference go very well together.
http://nadelectronics.com/products/hifi-amplifiers/C-375BEE-Integrated-Amplifier
http://nadelectronics.com/products/dac/C-375BEE-DAC-Stereo-Integrated-Amplifier
Bill
If you are looking at the $1500.00ish price bracket, may I suggest the NAD C375BEE or C375BEE DAC. Either will have no trouble at all driving those four 10 inch woofers and opening up the rest of the range. I think the NAD sound and Klipsch Reference go very well together.
http://nadelectronics.com/products/hifi-amplifiers/C-375BEE-Integrated-Amplifier
http://nadelectronics.com/products/dac/C-375BEE-DAC-Stereo-Integrated-Amplifier
Bill