Out of the box, I was a little disappointed in the onboard speaker volume level. After setting up a custom EQ, and turning up the compressor "Output" level to 75-78, it made a huge difference.

Bernie, do you increase the Reverb / Chorus and Resonance (Live Control) on the SX-900? and maybe the pa4X needs that tweek?

Dave, are you saying that turning OFF onboard speakers makes the external speakers sound better? I'm in the market for an external home studio speaker system, any low cost suggestions? lol

It's nice to hear everyone loving the SX-900. I do too