I have just read from few member that NAD is tight punchy where as Marantz is more on treble & comparatively less bass...i wonder that an amplifiers basic function is amplify what ever is fed to them...from millivolts to volts such that they can drive speakers...and a good amplifier can do this with less noise in it..best the amplifier better is amplification without noise...so if its the basic function of amplifier than the treble or bass enriched in sound is because of the source such as ipod,pc or cdp...since im new to this thing...im confused with this...i like People with good knowledge can help me get my confusion cleared