I, myself, make no sound
but you've heard me, at any rate
With my help, you may be drowned
I'm big, I'm small and I'm great
I am quite the hair raiser
What am I?
Edit: Apologies for creating a puzzle that is too broad and I can see why it has been marked as so. I'm not going to modify the riddle to make it less broad because I want to honour the current answers that people have put forward in the riddle's current state - some of which are very good. I don't think that changing/extending the riddle would be just. Therefore, this riddle will probably get closed.
Intended answer:
volume
I, myself, make no sound
Volume itself does not create sound
but you've heard me, at any rate
You can hear sounds at multiple volumes
With my help, you may be drowned
You can be drowned out by volume
I'm big, I'm small and I'm great
Volume can be big, small and a vast quantity
I am quite the hair raiser
Volume increases the thickness of your hair and makes it look bigger