was busy testing my brand new UCD 400's Class D amps and tried this with some borrowed JMLabs Profil 3 speakers.
Next speakers I tried were my own Driade D81 Mk2 awfull,
was this the once so beautiful sounding speaker? So I opened the box, what to look for?

Well, all the wires were plugged with amp. connectors. The speaker is about 8 years old I think.
So I soldered all the amp plugged wires to the crossover filter, fired her up...gone the distortion.
How simple can live be, but why the factory ever used amp. plugs........brrrrr.