Only problem with using most on-board speakers is that they are facing mainly towards, and intended for, the player.

I most always took a small stereo system with me...usually my MS-60S.

For the sake of a few minutes more setup, it was worth it, in my opinion (and experience).

The PSR-S950/S750 do have a nice full sound, nonetheless, the speaker system being new to these models, and for personal use they lack nothing.

Ian