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In Reply to: Exemplar Subwoofer posted by TerryO on March 21, 2007 at 18:09:23:
Greet!Hmm, let see, a horn is a BP and a Karlson is fundamentally a BP...... seems a good match to me. ;^)
Follow Ups:
GM states:
Hmm, let see, a horn is a BP and a Karlson is fundamentally a BP...... seems a good match to me. ;^)GM,
What got me was that John was pretty emphatic that the K-coupled sub was the only solution that had really worked for him. I suppose that it's really my own ignorance when it comes to Karlson cabinets that caused me to be surprised.
Maybe Freddi really is a prophet after all :^)
Greets!In a way. ;^) My experience with the K was as a young teen with keen hearing, and used ~fullrange with whizzer coned or co-ax drivers it was unbearable and nothing the owner did short of muting it with layers of thick grill cloth helped, but it did make mass quantities of what passed for bass back then, or what we now call mid-bass 'slam', even when fed an AM radio's signal. Once I experienced an Altec A7 though, the 'die was cast' for me and never looked back until Freddy asked me to pick the design apart several years ago.
Indeed, I was one of ones trashing them anytime someone would mention them on the old basslist, but once I got passed Karlson's BS marketing and the various audio 'gurus' apparent understanding of them, I realized that it was a well thought out design for limited BW use. The main problem being that it needs to be used in the LF BW where our hearing acuity isn't too good and XO'd to something else above its gain passband, so here is where Freddy and I diverge 180 deg. ;^)
Anyway, the front and back chamber creates the makings of a 4th order BP, the chamber above the driver increases it to 6th order and the one above the front chamber elevates it to an 8th order BP. No TL or horn action as some claim, just a bunch of resonant cavities tied together to highly damp the driver over a fairly narrow BW and why the driver barely moves at high power/SPL, making it ideal for a sub if designed to be most efficient in this BW.
Back on topic, vented cabs, compression horns roll off acoustically at ~24 dB/octave, so what better than to mate it to a cab that has a similar HF roll-off? Factor in that compression horns are highly damped with effective Qts as low as ~0.1, so must the rest of the system be for best integration and why I wasn't satisfied until I began using Low Fs, ~0.2 effective Qts drivers to fill in below the various compression horn systems I've had over the decades.
What is it that makes the Karlson a good match in this kind of a situation? Speed/sensitivity? And what would be a typical crossover frequency? And what would be a typical driver to put in the Karlson?It seems that the higher the sensitivity of the woofer in the main loudspeaker, the harder it is to get a good match with a conventional subwoofer.
with 416 it sounded very well damped compared to a B6 reflex. my kluge used an old EV Interface EQ peaked around 30Hz (~Fb), 2-3"Id elbow but "street-el" would be easier to mount. I had 1 K15/416 with 15W/channel receiver bimaping with cheap Behiringer to one Allied-Jensen 12" in K12 around 80Hz - best sound I ever had on theatre organ cds - but not sure why.
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