Why do my 288-8Ks sound like cr@p?

[Coendert2011]

I guess that 2kHz distortion hump would be at least somewhat reflected on freq response of the driver, wouldn't it?

BTW Beer is my drink of choice.

Good point, however these are the distortions @ 2kHz, so D2 is 4kHz and D3 is 6kHz! You can see the little response bumps in the smoothed curve at these frequencies. furthermore the level is worst case about 30dB below the response line, if distortions were absent the response line would marginally be lower.

Coen