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

[Geekstar]

On 288 extension:

I found a note from Altec Best on DIY forum saying 288s on 511E are good out to 12k.

Never saw an FR graph but presumably the acoustic EQ of the horn is such that it would bolt right up to a 288 without requiring correction for the old "3k haircut."

Whoa: Found AB's measurements here:

http://www.audioheritage.org/vbullet...on-a-511E-horn