I had one of those 'Naks years ago...and getting the clipping light to come on (300 watts pre side) meant things had become VERY loudThat may or may not be true, as it will depend on the sensitivity of the speaker and size of the room. Using a very low sensitivity speaker in a large room, it would be very easy for the clipping lights to come on, and not be very loud.
So again, what speakers are you using?