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In Reply to: RE: Tasteful finish for baby Classic horn ? posted by moray james on March 26, 2017 at 10:18:27
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
Le 1.4056 mh
VAS 78.1875 L - 2.76116 ft^3
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?
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?
Hey thanks Fred that's great information. The drivers are ten inch with about a 1/2" suspension. They have a good size motor as can be seen by the provided Bl value. As I said I am considering using the factory cabinet volume but solid stuffed with high density fiberglass and using only one woofer per cabinet.
Have you built up one of the cabinets shown? How did it work and how did you go about tuning it? moray james.
thanks to a great builder (Triticum Audoi) I have pairs of the K's below. As drawn by GregB, the Karlsonator12 is tuned to 37Hz - I'm not sure how to raise tuning other than maybe making it a couple of inches shorter in height. XRK971 could look at ways to raise Fb in the Karlsonator so I'll ask. I think Karlsonator 8 is tuned to 42Hz, which would be reasonable for some 8 inch speakers
The little 0.62 scale K15 probably has tuning around 70 and is tuned by "ear" with Beta10cx. When I reduced the vent area below what is shown, the graph showed no improvement in the lows with that 10" coax, little change in the 100Hz-200Hz area on a graph - but subjectively, it lost all its punch. If it had a more lively 10cx then Beta10cx, then it would probably whip my horn on things like bowed and plucked bass. Sitting on the floor and near a back wall, Beta10cx is too strong in the 100-200Hz area with the 0.62 scale K15. I intend sometime to add a subwoofer.
If I cam feel better, I'll try to get on the ball a bit and do more measuring and subjective trials.
these are mine - one mini-K15 is loaded with FE206EN - I need to pull Beta10cx from the Karlsonator12 and try a different 12CX with more midrange sensitivity than Beta10cx. I have an old Beyma 12cx in a slit vent Karlson 12 and if can get the crossover decent, then that will sound pretty darn good and maybe better than the Eminence stuff although the 80oz magnet Eminence 12cx are pretty good. Even the 109oz magnet 12CX sounded good - but less sensitive as has more coil overhang and a 4 inch coil.
Baby K15 (0.62 scale for 10" or 8")
Karlsonator 8 plan - tuned about 42Hz - nice size
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