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RE: Tasteful finish for baby Classic horn ?

Posted by freddyi on March 26, 2017 at 10:49:24:
in general, GregB's "Karlsonator" drops lower than a traditional Karlsoon. A K12 in 2pi with strong motor/low mass speaker will rolloff below 70Hz - but has a lot of "hit" - I prefer a K12 to my Klipschorns - but its not quite one on one with K-horn running a horn mid vs a PYM1298 (like Kappa12a) carrying the mids.
to get down low might mean pretty big - I think XRK971\s "XKi" alignment for either W8-1772 or Beta10cx was 60 liters total for one drive. That alignment seems to call for a 3:1 rear chamber to front chamber size ratio. Front chamber design/aspect and the opening are non trivial and bad result have happened. Karlson's originals with appropriate drivers play very nice.
Dual Karlsonator and dual XKi can be simulated - how low do you need?
Here's some specs Posted for a Klipsch CLF20 woofer
REVC 5.77 OHMS - DC resistance
FMS 35.7462
QES .4062
QTX .3546
Le 1.4056 mh
VAS 78.1875 L - 2.76116 ft^3
BL 12.0648
Sensitivity 91.1884 db 1w/1m

what is the cone area (or effective diameter) for your Klipsch woofer?
I wonder if there's any subjective improvement to using a DCR with only one external vent?
https://translate.google.com/translate?hl=en&sl=fr&u=http://www.petoindominique.fr/php/brsujet1.php&prev=search
original page
http://www.petoindominique.fr/php/brsujet1.php
Briggs placed his acoustic filter as to divide an enclosure into 2:1 chamber ratios - does that ratio hold in a traditional Karlson-type's rear chamber? - or just the rear to front ratio?