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dealing with basshorn distortion below cutoff - is it best to highpass right below cutoff?

Posted by freddyi on April 4, 2001 at 17:18:54:
Dear group -
below cutoff my Peavey FH-1 produce mainly odd harmonics - my Karlson 12" can play much cleaner and louder in the 35-60Hz region
this brings the question on using a high-pass filter - has anyone here had success with a sinple in-line 1st order electrolytic cap or is the slope too slow and cap's Z too interactive with most basshorn's Z-input?
I was given a 103% 3rd harmonic distortion figure for the Peavey FH-1 when driven with 100 watts @40Hz - it sounds about this way at much lower levels - this speaker builder put the same Peavey 1504 woofer from the FH-1 horn into a large Kalrosn box of his own design having ~7cu.ft. of back chamber tuned to 34Hz -the 3rd harmonic droppped from 103% to 8% and the fundamental was of course much louder and cleaner. (btw - the Karlson could only be used as a woofer below ~150Hz due to its interfence dip of ~240hz)
I will guess that a horn using a vented back chamber - if large enough will reduce distortion quite a bit within the port's tuning region (brings to mind DB Keele Jr.'s 18" W bin) - also use of 'floopy' woofers like the K33 may not be as bad as "real" horn woofers - at least below cutoff as they tend to act like a regular air suspension box with an air column.
Any comments? - I like horns but am not fond of odd order harmonic distortion when driving a samll horn below cutoff.
I don't know if 8% 3rd harmonic distortin of 40Hz at 100 watts input and 119.5dB output is special or not but I may look into a 'fat' Karlson for a woofer based on these figures.
F.