Thanks for a very honest review. Now it's up to the community to figure out how to get the best out of this speaker.
Thankfully build-in DSP already helps alot. I used the -6dB setting of the bass EQ (low-shelve filter) and -2dB for treble (high-shelve filter).
While I never got these into clipping with music (but with sine waves), I did not play any special low-frequecy music with sub 30Hz content.
Obviously the -6dB bass shelve + the second speaker give me 12dB more headroom than a single speaker w/o EQ.
Clipping should be avoided as the limiter produces high distortion (Palmer should address this).
So people playing with high bass-levels need some sort of high-pass filter with the corner freequency depending on the expected output level.
For my listening habits there is no limitation in playback levels.
The effectiveness of the cardiod dispersion in avoiding a rear-wall (behind the speaker) cancellation notch should be explored.
From my calculation this should only work with the speaker positioned right at the wall (passive cardioid effective in the lower frequency range of the midrange speaker which plays down to 250Hz).
Narrow dispersion angle means a more focussed sound image than wide dispersion.
I personally did not like this as much as the wider image of my other speakers which have neither waveguide nor cardioid.
For me it helped to make the speaker point straight instead of toed in toward the listening position.
This way you get more side reflections which widens the sound stage.
It's a matter of taste weather the result is wide enough.