It may just be that your amplifier volume pot is geared sensibly and input sensitivity is reasonably low ie. max volume is not at 11 or 12 as with some others. It also means the inputs are unlikely to overload with high output sources.dakchi said:
All this is just an assumption as I am not familiar with your amplifier.
As long as you can still achieve high volume without audible distortion with your turntable as source I wouldn't worry.