RE: Playing with acoustic foam :)

High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

Posted by freddyi (A) on August 6, 2016 at 15:27:23

In Reply to: RE: Playing with acoustic foam :) posted by KanedaK on August 6, 2016 at 01:37:44:

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

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Follow Ups Full Thread

Topic - Playing with acoustic foam :) - KanedaK 15:32:50 08/03/16 (15)

RE: Playing with acoustic foam :) - moray james 08:08:25 08/04/16 (3)

RE: Playing with acoustic foam :) - freddyi 15:18:33 08/04/16 (2)

RE: Playing with acoustic foam :) - KanedaK 01:37:44 08/06/16 (1)

RE: Playing with acoustic foam :) - freddyi 15:27:23 08/06/16 (0)

Consider some heavy soft woolen felt - rickmcinnis@dogwoodfabrics.com 06:44:49 08/04/16 (1)

RE: Consider some heavy soft woolen felt - KanedaK 01:29:09 08/06/16 (0)

RE: Playing with acoustic foam :) - Inmate51 19:58:45 08/03/16 (6)

RE: Playing with acoustic foam :) - KanedaK 03:55:54 08/04/16 (5)

RE: Playing with acoustic foam :) - KanedaK 04:07:29 08/04/16 (4)

Morphing - Inmate51 07:35:38 08/06/16 (1)

RE: Morphing - KanedaK 08:37:01 08/06/16 (0)

RE: Playing with acoustic foam :) - horn kid 15:35:21 08/04/16 (0)

What are they? - Ivan303 07:21:50 08/04/16 (0)

RE: Playing with acoustic foam :) - YRY 17:44:42 08/03/16 (0)

RE: Playing with acoustic foam :) - KanedaK 15:33:30 08/03/16 (0)

Follow Ups

RE: Playing with acoustic foam :) - freddyi 15:27:23 08/06/16 (0)

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