No, Alex, you're the one in control of how loud your M60s play, not the amp in your present receiver or in a new receiver or separate amp. Adding still more maximum power capacity doesn't make anything louder unless you intentionally turn up the volume level beyond what you were using before and the new level is something that your present amp couldn't do(unlikely).Keep in mind that power increases in a logarithmic, not linear way. This means that power increases from 1 to 2 watts, 10 to 20 watts, 100 to 200 watts, 1000 to 2000 watts, etc. would create the same increase in sound level(if the extra power was in fact put into use)of just 3dB, a noticeable but not substantial amount, especially if the sound level was already over 100dB(e.g. an increase from 105 to 108dB).
