Quote Originally Posted by vuki View Post
IMPulse measurement from 1m distance would tell a lot. 3ms window is just about right. Do it also with the crossover and then do the RTA of the complete loudspeaker at listening position.

Since there is clean 6dB/oct. rise in your measurement I suspect that it is something with the measurement setup (wrong generator signal?) because if corrected (by 6dB/oct.) you would get nice 288k response
Thanks,

I will fire them towards the ceiling for maximum free space and measure at 1 meter like you suggest. I have planned to recheck the complete setup to eliminate all hidden faults. The strange thing is that it is a high pass characteristing which implies a series capacitance or a shunt inductance. Where to look for those?

Fyi i used the same settings in a loop feedback configuration (as part of the calibration process) and the response was completely flat. Let's first put the amp in that loop...

Coen