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

[Coendert2011]

Earl, those are nice smooth graphs. There is still quite a peak in the resonace area (12,5 kHz?), don't they sound a ltlle 'hot'?

I save the smooting of the fr for a rainy day, first priority is to get rid of the harsh sound. This is probably not a thing of 1/2 a dB, so I'll experiment with my consumer grade stuff first. Finding a ls measuring pro around here is tough, this is not a common skill around here.

Any suggestions on the replacement of the phragms? Should I stick to the same partnumber or is there an alternative tried and tested part#?

Shipping the units two ways to the US is pretty expensive and than I am not even mentioning the customs hassle. I'd rather do as much as possible locally.

Thanks, Coen