Due to some (clever) thinking and linking up my macbook line in with my stereo, I have made some analysis with Audacity that I wanted to share with you.

What I did was to measure a full range white noise frequency spectrum from:
1) line out on my cd player
2) high output on my M552 which is wired for CCBFREQ and was crossed over at 200Hz

By comparing these using the spectrum analysis function of Audacity you can see the CCBFREQ effect from the M552. I am not too sure about the dB scale. That is why I crossed it at 200Hz to be able to see if I can find the 24dB/oct. This looks correct (see the about 24dB difference between 100Hz and 200Hz), so does this mean the CCBFREQ is really only about 6dB between 2000Hz and 17500Hz?

first the full range line signal from the cd-player output:


then the fullrange signal (hmm, actually it looks like it was crossed at a low frequency, but just look from 200Hz upwards) from the high output of the M552 with CCBFREQ:


then the signal crossed over at 200Hz from the high output of the M552 with CCBFREQ:


I'd love to hear what you think of it!