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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: Karlson Tuned Pipe posted by AstroSonic on February 7, 2007 at 08:38:00:
I guess, K15's shelf acted to offset one dip; its rear portion was a lowpass filter, and whole thing added to the vent's air mass.a front shelf (depending upon angles and height) may not be necessary in some couplers but think short front shelf (an inch or two) can be used as tuning tool to adjust tone and normally are placed right above the woofer and their length determined "by ear" with music tracks - perhaps the front shelf modifies mix ratio of how much energy reaches the upper half of the front pipe. (see Karlson's first Acoustic Transducers patent for mention of "protuberances"
Karlson's 1961 letter to Poppe mentions K15's shelf
Shelfless (had rear shelf) large wing gap coupler for 18 or 15 smaller than K15 (32Hx16Dx21.25W - 23 degree baffle; 10 degree port board, 2-4.5"x4.5" vents)
Z for that coupler
Stock K15 Z - 3rd peak ~155Hz
30 degree coupler 21.5W x 20D x 32H with 18" - effect of a ~5.75" front board at ground-plane
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Follow Ups
- Re: Karlson Tuned Pipe - -Karlson's matching shelf - freddyi 10:52:51 02/07/07 (1)
- Re: Karlson Tuned Pipe - -Karlson's matching shelf - AstroSonic 19:58:10 02/08/07 (0)
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