Parents need clear sounding 2 ch HT

My parents are always complaing they can't understand what was said on their TV. I set them up with a Pioneer digital receiver and set of Solioquy bookshelves.
This was before HDMI and i ran the 2ch out from tv into receiver.
My question is how do i get them better, more clear sound? Do i need to scrap anything or just get an integrated that accepts hdmi? New speakers? I'm not sure what course i should take.