Hi Fran.

I had the E80 long enough to test out all of the speaker settings and to be honest the internal ones are nothing special (they are better than the set you can purchase for a Tyros 2 though).

The E80 is best played through a PA, good sound card/speaker setup or a decent set of headphones.
After spending that amount of £/$ on an E80, would anyone really want to use the internal speakers alone anyway?
It still remains an excellent arranger