High Efficiency Speaker Asylum

• 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 09:32:25 07/27/03 (7)
  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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  • 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)
    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 djk on July 27, 2003 at 09:32:25:

    Hey Dennis - does this imply sometimes using an underdamped 2nd order lowpass on the horn's woofer? - if so maybe a general example please?
    
    

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    • 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)
      In Reply to: Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) - Q-Q? posted by freddyi on July 27, 2003 at 10:32:07:

      

      http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=4,237,340.WKU.&OS=PN/4,237,340&RS=PN/4,237,340

      http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=2612558.WKU.&OS=PN/2612558&RS=PN/2612558
      
      

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      • 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)
        In Reply to: Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) - Q-Q? posted by djk on July 27, 2003 at 17:31:52:

        thanks DJK! - poked in corner (not in use) - still have one K-horn bottom - could run with Cobraflex & maybe 2-KSN1016A on 10W tap - 203B sticks out kinda far - mono is cool
        
        

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  • 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)
    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 djk on July 27, 2003 at 09:32:25:

    Hey DJK - didn't know Community had hi-fi paging horn - pretty cool - are they tough to find used?

    for K33E - that J-horn...

    not seen the 1946 xover nor AA schemes - are some online?
    
    

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    • 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)
      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 09:52:33:

      Here is a pair of RS440:

      http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=23794&item=2547125192

      Here is an R2, they make about six different versions, the only difference being the pattern on the MID/HF horns. Also available in a wood box.

      http://www.loudspeakers.net/files/specs/new/r2_694.pdf
      
      

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      • 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)
        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 djk on July 27, 2003 at 17:59:19:

        neat - won't ship - missing drivers - at least now know what they look like - will check out pdf - many thanks!
        
        

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        • RS440 vs R2 - djk 23:25:34 07/27/03 (0)
          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 18:37:56:

          The ones on eBay are RS440, an old model.

          The pdf is of the newer R2, which looks like a fiberglass paging horn, but has dual horn-loaded 12s, an M200 2" mid, and a 1" Eminence titanium for the tweeter.

          The RS440 need a pair of:
          Audax PR17
          Emilar EC175 diapragms
          EV 15L
          Four piezo motors

          Call it $500 and all parts would be new.

          It would probably cost $300 to have them picked up and strapped to a pallet and shipped.
          
          

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• Re: You'll never get a 15" to 650Hz in a folded horn; i.e. mass roll off. (nt) probably right - my 100Hz Edgarhorns - Lightning 09:25:10 07/27/03 (1)
  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:

  Hi Freddy,

  wonder how PWK's little J horn with 'doors' would do?

  What are you referring to? I've never seen a Klipsch designed J horn. Do you have any links or other info? I'm very curious.

  Thanks and regards
  N
  
  

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  • Re: You'll never get a 15" to 650Hz - doors and PWK - freddyi 09:33:06 07/27/03 (0)
    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 Lightning on July 27, 2003 at 09:25:10:

    look here - autoformers/doors/K33E ~66Hz flare = compact
    

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