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Thread: Building new sub/mid box

  1. #46
    Obsolete
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    Yes, I've used the 2242H in corners to great effect. They seem to like the boundary reinforcement. Let us know what happens when you get the second one up and running

    *****

    BTW, have you read this? 4645C
    It has some response curves on the back showing various boundary reinforcement responses.
    Last edited by 4313B; 01-26-2004 at 03:29 PM.

  2. #47
    Super Moderator Hofmannhp's Avatar
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    Re: Rattles to fix

    Originally posted by maxwedge

    Right now I've got the crossovers set to about 200/1200 but I'll fine tune latter with the RTA. I know the placement isn't the best but I'm thinking that maybe I'm getting a deep base increase (+6db ?? guess?) being in the corner. Maybe this will go well with a 25hz tunning. Any ideas on this?

    Scott
    Hi Scott,

    which port dimensions do you use?

    2 x 4"? depht?

    HP
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  3. #48
    Senior Member maxwedge's Avatar
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    Origginally posted by Hofmannhp
    Hi Scott,

    which port dimensions do you use?

    2 x 4"? depht?

    HP
    Hi HP,
    There's a port in the rear so theres 3. The reason one is in the rear is because I used flaired ports, and the outside diameter of flair's flange is 7", so I couldn't fit 3 on the front. The 3rd one was too close to the 18 and would have weakened the baffle.

    The tubes are 4" diameter and 13.15" useful length.

    The box has 8.8 cu ft after dog box and bracing taken out of the total.

    I lined most of the inside with 2" of R16 fiberglass.

    One little note about the fiberglass that a freind tipped onto me....you know you're not supposed to breath the stuff, so you cover the inside ends of the vent tubes with ladys nylon stockings. They work as a filter and don't block the air flow. Just cut a peice out and strech it over the end. Then put a rubber band on to hold it. Had the wife buy me some so I didn't have to use her's.

  4. #49
    Senior Member maxwedge's Avatar
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    Originally posted by Giskard
    Let us know what happens when you get the second one up and running
    I got another to do? Shoot I just cleaned up the garage! I should have made 1 box with 2 2242h's lol! I'll get right on it....had to reorganize. It was getting pretty messy!
    BTW, have you read this? 4645C
    It has some response curves on the back showing various boundary reinforcement responses.
    Yeah I've looked at those but I really don't get them.
    I don't understand what they mean by 1pie, 2pie and 4pie

    Scott

  5. #50
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    "I don't understand what they mean by 1pie, 2pie and 4pie"

    They read "Little Jack Horner" too many times before bed when they were tots.



    I'm lazy so here's something you can read that might help - Pies in Corners

  6. #51
    Senior Member maxwedge's Avatar
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    Ah yes, I knew about this but didn't get (or remember?) the symbols. Ah...and I guess it's pi and not pie ...gotta put the kids books down.

    thanks

  7. #52
    jkc
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    I recently built almost the same bottom end as you.
    I used 18dB/octave active filters at 120 Hz and 1.2Khz
    The Sub has a 1Kw amp and the 12" a 350 Watt amp which clips first.
    I use a dedicated active equaliser built into the crossover on the 12" to get around the problem of a climbing frequency response.
    The 12" is in a 0.8 Cubic foot vented enclosure tuned to 85Hz.

    If look at this more you start to think about a 15" to 300 Hz and a 10" to 1.2K.
    Any way the top is a Altec 288K on DDS Wave guides with slots on top.
    When I first turned it on it sounded awful on voice but once I took it all outside and ran it at full power for a while it sounded much better. very nice indeed.

    the 15" and 10" are in the garage.

  8. #53
    Super Moderator Hofmannhp's Avatar
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    they work

    Hi All,

    they've done the first realistic sound with music instead of pink noise and sine waves.
    I used an active crossover (Rane AC23) and THEY SOUND GREAT.

    In the pic you see their "non living room" design with new to paint lens and without grille.

    HP
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  9. #54
    Senior Seņor boputnam's Avatar
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    Hey, HP...

    Those are real beauties!
    bo

    "Indeed, not!!"

  10. #55
    Senior Member maxwedge's Avatar
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    Lookin good

  11. #56
    Senior Member maxwedge's Avatar
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    Thumbs up 2 cabinets in house!

    Got 2 up and running and they really sound nice. I don't really care for the round grills but they'll do (have 2 cats that like to scratch things!!) untill I get some covering on them. I need to fine tune them but I'm in no big hurry cause I need to get some smaller surround speakers built and then I'll tune 'em up.

    EDIT: I just noticed you can't really see those grills in this picture, but their there.
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    Last edited by maxwedge; 02-20-2004 at 05:36 AM.

  12. #57
    Super Moderator Hofmannhp's Avatar
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    Re: 2 cabinets in house!

    Hi Scott,

    they look great......what do you use for high frequencies? I cannot see any HF drivers.
    Do you drive them active or passive? and which Xover frequencies do you use?

    regards
    HP

    PS: the badges are here since yesterday.....was very fast...thanks again. They fit perfectly to my grilles in a reserved way. I glue them on their backplane and press a small metall bracket on the pin. This is very easy cause I use a perforated sheet metal as grille.
    I will post a pic when they're ready.
    Please help us save more info about the vintage systems. Let us register your speakers and drivers.

  13. #58
    Senior Member maxwedge's Avatar
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    HI HP,

    You mean U HF? Don't have any yet....those are 2445's on top and they go fairly high. I haven't played with my RTA yet and fine tuned them....just playing by ear. They are crossed over at 200 and 1200 for now with a Rane ac23....I'm goona do some more adjustments this week end.

    Glad you got the badges so quick.

    Scott

  14. #59
    Senior Member maxwedge's Avatar
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    new pic

    Still not done but now theres some 2404's on top.
    Sub 1500's in the center ...5cu ft sealed box
    On the sides....2242's/2202's/2385 horns and 2445 drivers/2404h UHF
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  15. #60
    Senior Member Flodstroem's Avatar
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    Thanks Giskard

    Ive been following this thread with interests from start and If you didnt thought of it, you gave me a tip for an Apple-Mac loudspeaker designing software in here

    I'm lazy so here's something you can read that might help - Pies in Corners
    About MacSpeakerz
    Loudspeaker Design Software for Macintosh:

    http://www.trueaudio.com/mac_abt1.htm

    They also have e demo which I would like to try before buying a full version.

    Do you know anything about this software product (Windows or Mac version doesnt matter)?

    Regards
    Flodstroem

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