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In Reply to: RE: Playing with acoustic foam :) posted by moray james on August 04, 2016 at 08:08:25
a tapped pipe or horn would help. I like to use felt under a K-tube when the tube is sitting on top of a Karlson coupler. A baffle at the K-tube's plate might help on the lower end of the K-tube response.
FWIW, I prefer a Karlson 12 to FH1 but FH1 with an Altec 511 midrange and tweeter makes a good rock and roll speaker. A K12 with 200 watts amp can kick well for such a tiny cabinet. EV's Sentry IV horn above behaved oddly with just a cap and an 1823M - perhaps that driver needed a 2nd order highpass - ?
Karlson Evangelist
Follow Ups:
I have a pair of karlson (15?) I started to work on (see my other posts)
they can't, however, match the 104dB sensitivity of these FH1/klipsch/EV hybrids.
My main amplifier is 2 x 8watts and I like to crank it up! :)
a karslon tube with a compression driver is something i moight try in the future to go with the Karlson bins. For now, the midrange is played by some Philips vintage cone mids (AD5062SQ4) in big frontloaded exponential horns. I need to build crossovers (375Hz/3500Hz first order maybe?) and buy tweeters. this karlson project is just for fun and has to cost next to nothing (that's the challenge). as long as it makes some "big bold sound", with reasonably flat response, I'm happy.
Karlson is probably close to 99dB (good 8 ohm 15" woofer) and will play cleaner in places than the FH1 (perhaps not cleaner than DJK's Vented La Scala mod which you could easily add to your FH1 - being a vented hybrid you can treat it like a 6th order bass reflex and add some boost centered around ~1.03* tuning)btw, imo K33 sound like a weak toy in K15 compared to say Altec 421
David A. Young's notes from Job Ulfman's Karlson forum
"As a low frequency cabinet, the Karlson is usable to 35hz with
low harmonic distortion. Like any enclosure that depends on porting to augment the bass output, Theile-Small parameters have
to be taken into consideration.(I disagree with the low crossover point - his interpretation of a "K18" had a large rear chamber, and 20dB hole - it was interesting to have good distortion with the EV18B)
I have yet to measure anything of
comparitive size that came close. They get ugly above 175 hz. and require a crossover set from 100-150 hz.The key to its low freq.performance is the coupled front chamber. The increased air pressure loads the cone and dampens it. A front loaded woofer and
a horn loaded woofer operating below cutoff doesn't have that advantage.Twice I've measured the 3rd harmonic of 40hz(120 hz) louder than the fundamental with 100 watts feeding the speaker.
The Peavey FH-1 and a Yorkville 2-18 with RCF's. When the 1504-4
Black Widow was tested in a 12 cu. ft. Karlson, the 3rd harmonic
distortion went from 103% to 8%. I didn't have the Yorkville long
enough to switch speakers."
Karlson Evangelist
Edits: 08/06/16 08/07/16
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