the outputs are a 1/4" stereo headphone output, just like the DGX series. The improvement is in the Master EQ setups. Yamaha has done a good job of having settings that optimize what you source system might be, headphone, internal speakers or powered monitor or amp system. I've have tried them all and there really is a big difference between the set ups.
George Kaye
Kaye's Music Scene
Reseda, California