The Korg PA-800 has built in speakers, as well as Roland's recently departed E-80...I would say they are TOTL arrangers.

The newer Roland arrangers offer speakers(Prelude) or speaker-less(GW-8)..of course, they are low end, but they still offer many pro features (except style assembly... Grrrr).

The Tyros has always offered matching (attachable) factory speakers as an option.

The MOTL arrangers, like the S910, are far from being a burden instruments in this range used to be...in fact ever since the PSR-2k, the mid line is impressive to play...I have the Tyros3 here as well, and I prefer playing the S910...it's just exactly what I want in an arranger...especially the built in speakers.

I forgot...one of my first band keyboards, the Hammond M-3, had a built in speaker...I'm so ashamed.

Ian