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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: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) probably right - my 100Hz Edgarhorns posted by freddyi on July 27, 2003 at 08:33:55:
If you look at the 1946 PWK crossover for the Klipschorn it has a high Q section to boost the mids from the folded horn. Big caps were expensive so he did it at the plate impedance level ahead of the output transformer, and used a second small transformer for the highs.The 1976 J-horn patent also has this, as do the post 1980 versions of the AA networks for the Klipschorn/Belle/LaScala (AK, AL, AB).
In general, the higher the mass corner on the woofer, the less the x-max. I usually pick the longest x-max driver that will 'make' it to the crossover point. With a high Q crossover I can generally 'make' the crossover an octave higher than the mass corner.
Community makes what looks like two little J-horns mating on a center axis. Uses dual 12" drivers and claims to go to 70hz (24" X 24" mouth). Crosses at 600hz to a 2" throat co-axially mounted mid horn/driver, and a 1" at 4Khz. With a touch of EQ, 250hz cut, these sound very 'hi-fi'. Mainly for paging, they also can do music at reduced levels. Above 100hz they can really do it. I was using a bridged AB International amplifier rated at 2.8KW and just pouring the coal to them!
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Follow Ups
- Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) probably right - my 100Hz Edgarhorns - djk 07/27/0309:32:25 07/27/03 (7)
- Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) - Q-Q? - freddyi 10:32:07 07/27/03 (2)
- Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) - Q-Q? - djk 17:31:52 07/27/03 (1)
- Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) - Q-Q? - freddyi 17:50:06 07/27/03 (0)
- Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) probably right - my 100Hz Edgarhorns - freddyi 09:52:33 07/27/03 (3)
- Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) probably right - my 100Hz Edgarhorns - djk 17:59:19 07/27/03 (2)
- Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) probably right - my 100Hz Edgarhorns - freddyi 18:37:56 07/27/03 (1)
- RS440 vs R2 - djk 23:25:34 07/27/03 (0)
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