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Thread: 604 in back loaded horn?

  1. #1
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    Cool 604 in back loaded horn?

    Did Altec used 604 in a back loaded horn?

    According to this site back in 1945 there was model A6 using 15" duplex.

  2. #2
    Senior Member CONVERGENCE's Avatar
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    Hi

    I have some reservations concerning that post. The 604 could be mounted in a bass horn unless the horn tweeter was extended to the front of the bass hprn like the DTS system. Here is s sight with the description of the A6 in the 1940's.



    http://www.voiceofthetheatre.com/images/A6.early.jpg

  3. #3
    Administrator Robh3606's Avatar
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    Take a look in the Library to see what they have

    http://www.lansingheritage.org/html/...ltec-plans.htm

    Rob

  4. #4
    Dang. Amateur speakerdave's Avatar
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    His word "this" is a link and there is a chart at that site listing an A6 with a Duplex.

    David

  5. #5
    RE: Member when? subwoof's Avatar
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    jbl 4530 with 604C

    Back in my large-scale cabinet building days I made a pair of single scoops with oak plywood for a client. The baffleboard behind the mounting panel needed a special recess made to clear the driver but it turned out to be a killer system for the guy.

    He complained that his old marantz tube components needed too much service and he wanted me to take them in trade as junk...I said "no room" and declined.

    Man that was a mistake of youth...

  6. #6
    Charley Rummel
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    A 604 in a 4530-type horn? Cool!

    That sounds like an incredible idea! In all the years I've been into scoop designs I never considerred one with a provision to allow clearance for the back of a 604, since thay are deep to begin with. Without looking up the numbers right now, I'd think likely candidates would be the 604E and earlier versions for such a proposition.

    Regards,
    Charley

  7. #7
    Tom Loizeaux
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    Even JBL's current 2155H duplex could sound great in one of those cabinets!
    Anyone tried it?

    Tom

  8. #8
    Senior Member CONVERGENCE's Avatar
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    Altec VOTT line were all for the most part front loaded horn cabinets except for A8 and more recent models like A10 A12 A6 1993 year.

    I would be surprised if the year 1945 A6 was a rear loaded horn.

    Someone with more past experience should look into this matter.

    The web site "another Altec page " does indeed state a duplex in a A6 cabinetfor the year 1945.

    The Marketing brochure of that year shows otherwise. ( front loaded horn ).

  9. #9
    Dang. Amateur speakerdave's Avatar
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    Right. They could have altered the back of the cabinet to fit a duplex in the place where the woofer would have been.

    David

  10. #10
    Senior Member CONVERGENCE's Avatar
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    Speaker Dave I don't quite get what your trying to say about alterations. You either have a front or rear loaded horn cabinet . A front loaded cabinet cannot be be altered into a rear loaded cabinet just like that. They are two completely different shaped horn cabinets.

  11. #11
    Dang. Amateur speakerdave's Avatar
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    The duplex mounts, as I said, where the woofer is usually fitted, and is front loaded, with the little concentric horn peeking out at you. I believe the back of the cabinet would need to be altered because the duplex is so deep. Otherwise it would be unchanged. It seems to me we have a photo of such on our site. I'll look.

    David

  12. #12
    Dang. Amateur speakerdave's Avatar
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    I'm not finding anything. I think there is confusion in this thread from the beginning, and the original poster has not come back to clarify. He mentions back loading and then refers to a speaker that front loads. I don't know if he means front load with a horn and back load to bass reflex (what the A6 would do) or what. I've looked on our site and done some searches at Great Plains Audio forum and have not come up with anything. I've also looked again at that site he links to and I don't think it is totally reliable.

    I'm going to drop the whole question.

    David

  13. #13
    Senior Member CONVERGENCE's Avatar
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    Tom Loiseux said :Even JBL's current 2155H duplex could sound great in one of those cabinets!
    Anyone tried it?

    Tom



    Well first of all it is not called Duplex but Coaxial ,Second the 2155h is a ceiling speaker with fr. 60hz-17 khz. Not HI FI to me.



    .................................................. .................................

  14. #14
    stpower
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    The 1945 Altec catalog does indeed show an A-6 with a duplex. The model # duplex is only listed as "special".
    The enclosure appears to be the same H-110 used in the early model A-5, larger than the 825, smaller than the 210.
    It is the usual VOT type front horn load, rear bass reflex load.
    I don't know how they handled the depth of the duplex speaker. All VOT enclosures I have seen don't have very much clearance behind the shallower 515 series woofers.

    stpower

  15. #15
    Dang. Amateur speakerdave's Avatar
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    Thanks for that. You may have a catalogue not in the library here. A scan of it would be much appreciated. One of the moderators may chime in and say how it can be sent in.

    Thanks,

    David

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