I think it's a table saw, not sure about the rpm on the motor though. From sound it seems like the motor is running on lower rpm. Using what looks like conventional 12-14" saw blades is cheaper than diamond coated saw blades which require water to slow down wear (wet saws), or diamond wire saw.
Seeing how they cut nat stones, without any protection for with pretty basic equipment always amazed me.
Dang, for a moment there I thought it was Dave. Then I got to thinking, Dave, why not? Cutting your own stones seems like a natural progression from sharpener to knife maker to natural stone guru.