Well the DSP analogue outputs are bandwidth spec'd at 20Hz - 22KHz, (-3dB points). I don't know if the output stage after that has any more restrictive bandwidth limitations.

I do know that I've output a 17KHz tone and got a reading on my RatShack meter, but since I was using a crappy set of soundcard speakers it wasn't even worth applying the microphone correction curve and crunching the numbers. I suppose that I could use a multimeter to take a measurement at some point, but 17KHz is the highest that I could measure using this technique (the sinewave generator in the DSP tops out at 17KHz). Anyway I'm fairly condfident that there wouldn't be any artificial post DSP limitations below 17KHz, and considering that I can only just hear that and also that you are talking about audible problems around the 11KHz range, I'd suggest that the empegs hardware is not causing the problem that you are seeing^H^H^H^H^H^Hhearing.