<font color='#000000'>Peter;
Using a receivers internal amps with an amp section any less than a flagship product such as those from Denon, B&K, Yamaha, etc is not advised given the low sensitivity and reactive load impedance these speakers present. I would strongly caution potential buyers to mate these speakers with a high quality, low impedance dedicated amplifier. I should be able to put up some impedance plots of those speakers in a few weeks when my equipment returns from calibration.</font>