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Thread: Altec 820A Corner horn??

  1. #16
    Senior Member Tom Brennan's Avatar
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    Dylan---I don't think they'll get anywhere near 40, the book says an 80hz cutoff. Those are awfully short horns and don't seem to have the bass reflex augmentation of VOT boxes.

    On the other hand the corner placement may help. I dunno. I reckon if you build them you'll find out.

    Might be worthwhile doing a fiberboard mockup of half of one, one 15, sitting it in a corner and see how low it goes. It should be pretty easy to just make a quick and dirty flare and rear chamber.

  2. #17
    Dang. Amateur speakerdave's Avatar
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    As I recall Davis et. al. said that horn loads down to 80 Hz, but with the boundary reinforcement of corner placement and the radiating surface of those two fifteens to engage room rise, I believe you would get adequate bass for listening to music in many situations.

    David

  3. #18
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    Just a thought....

    Since the horn's pretty much an 817 horn (or vice versa) less the reflex area, it wouldn't be much of a stretch to merge both designs, with vents in place of the 820's unsightly end caps, but still in a furniture-grade corner cab. If there's enough Vb left (>7cu/ft), a pair of 416s should feel right at home....
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  4. #19
    Senior Member Dylanl's Avatar
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    So what would that bass cabinet produce in Hz? I want something that will get down to 30hz flat lower if possible and have a sweet midrange. A 511 or other horn should be able to handle the top section.
    I don't think that this should be that hard to design I just dont know what design would be the best candidate.

    I looked at two other designs the Tannoy Autograph ( Folded Horn ) & the Jensen Imperial.

  5. #20
    Senior Member Dylanl's Avatar
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    The imperial has great bass extension. It's big though and not wife friendly at all.
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  6. #21
    Senior Member Dylanl's Avatar
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    The Tannoy has a huge following and great reviews but its a very complicated build.
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  7. #22
    Senior Member Tom Brennan's Avatar
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    I think you should use big subs. The 820 cabinet would be most useful to give the glorious upper bass and midrange of Altec woofers in VOT type horns.

    You could take them for that and then plumb low with some big dynamic subs based on multiple 15s or 18s.

    I used a pair of JBL 4648s to augment some A5s I had below 100hz. With wall placement and 6db of boost at 30hz they were flat to 25hz in my room.

    Yeah, I know you shouldn't EQ vented speakers but it worked.
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  8. #23
    Senior Member Dylanl's Avatar
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    Sorry one more note: I want true two channel ( no subs ). So I know it will take a special speaker to fill these needs.

    Suggestions?

  9. #24
    RIP 2011 Zilch's Avatar
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    Quote Originally Posted by Dylanl View Post
    Sorry one more note: I want true two channel ( no subs ). So I know it will take a special speaker to fill these needs.

    Suggestions?
    http://audioheritage.org/vbulletin/s...ad.php?t=13538

  10. #25
    Senior Member louped garouv's Avatar
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    Quote Originally Posted by Tom Brennan View Post
    to augment some A5s I had below 100hz.
    so, A5 = 515B and 1.4" Altec?

    Is that an Edgar Horn?

    and were you tuning the 825 cabinet's port in that picture?

  11. #26
    Senior Member Tom Brennan's Avatar
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    Loup----That's a 515B in an 825. At the time of the photo I was using 2420s on Edgar saladbowls. At other tines I used various top ends including 288Ks on tar-filled 1005s, that's a proper A5.

  12. #27
    Senior Member Dylanl's Avatar
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    So was there a design that I missed in that thread. I saw talk of drivers but nothing else?

  13. #28
    RIP 2011 Zilch's Avatar
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    Quote Originally Posted by Dylanl View Post
    So was there a design that I missed in that thread. I saw talk of drivers but nothing else?
    Five vented designs are given there via box sizes and tunings for five drivers....

  14. #29
    Senior Member OLDGEN's Avatar
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    i am in experiment now with a corner bass loudspeaker

    here is
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  15. #30
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    That should load nicely into the corner!

    John

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