Are my sentences about "voice" correct? Thank you!
(Talking through Skype) I can not hear you clearly even if I have turned up my computer to the max volume. I guess it's because your voice is too low[or small?]. Could you speak louder?


Are the sentences above correct?

I think "your voice is too quiet" is better here.
You could also say  "your voice is not loud enough" but it is not so good as you are about to say "can you speak louder".