First time poster - just bought a Denon 2308ci AV rec'vr and hooked them up to my older RM5000 sats w/sub and ctr and M5 surrounds. Well, when I have the iPod mode selected it seems the volume has to be turned up much higher than if I play other modes (and frankly, I'd like the sound for the other modes to be bolder and not have to turn the volume up to -10 to -5db for enjoyment.) What is the norm for db levels if my room is 20x20 with a high ceiling and I have it on 5 channel stereo? Is it because the RM5000's are smaller and older or maybe my set up is not right on the rec'r? Would larger front speakers and matching ctr such as the RTi10 or RTi8 give me more volume and bolder sound? What about a powered sub?