Hello! 

First I just wanted to post my test results to confirm if these are "ok". Especially because I built two units hoping to use them in the 2-bus. At 80 Hz I see quite a "drift" from the "norm" on both units, or is this "ok"? Something i should do/change/calibrate? I did the test with two different DMMs with quite same results. Unfortunately none of them get the 10kHz :-(

 Second: Is it possible that with 30 IPS there is no "roll-off" at all in the hights?

Thank you so much for your assistance and kindest regards,
Ivo