Wheelz, if I followed what you described, you use a higher setting on the master volume control on your Denon to get a similarly high sound level with the RPA-1 than with the Denon alone. If so, this isn't especially unusual and means only that the RPA-1 amplifier has lower gain than the internal Denon amplifier and therefore needs higher voltage output from the Denon pre-amplifier, which you get with a higher volume control setting. This isn't a problem as long as you can set the Denon volume control high enough to get the sound level you require, so relax and enjoy.
