Yes Jason, your EP600 curve actually looks pretty good from about 20-85Hz. The very sharp drop centered around 90Hz may be due to the measurements being taken near the middle of the 12' room dimension, with a resulting null theoretically around 93Hz.

The point that's been brought up previously about a possible unusually low EP600 input impedance still apparently hasn't been explained, and again, it would be nice to know the spec.

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Enjoy the music, not the equipment.