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Thread: 4688 TCB Monster Subwoofer

  1. 01-09-2007, 09:54 AM #31
    Zilch
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    I believe I paid $400 to have it shipped across the country.

    The ports are 8" diameter, not 4".
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  2. 01-09-2007, 10:12 AM #32
    mikebake
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    And why do you suppose JBL dropped these from their line-up?
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  3. 01-09-2007, 10:22 AM #33
    loach71
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    Quote Originally Posted by Zilch View Post
    I believe I paid $400 to have it shipped across the country.

    The ports are 8" diameter, not 4".

    I'll post my BB6P model here later today....
    AAHHH -- a light switches on in my n00bish brain!

    Thanks for the help Zilch!
    Amazed I'm still alive!
    Tim
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  4. 01-09-2007, 12:20 PM #34
    Zilch
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    Quote Originally Posted by mikebake View Post
    And why do you suppose JBL dropped these from their line-up?
    They dropped them because of a Bose patent infringement allegation.

    That patent having expired, the TCB approach has crept back into some recent JBL designs....
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  5. 01-09-2007, 12:36 PM #35
    mikebake
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    Quote Originally Posted by Zilch View Post
    They dropped them because of a Bose patent infringement allegation.

    That patent having expired, the TCB approach has recently crept back into some recent JBL designs....
    No way! Where'd you learn that? I figured it was a performance, or performance vs. cost issue. Not to mention weight.
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  6. 01-09-2007, 01:01 PM #36
    Zilch
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    Quote Originally Posted by mikebake View Post
    No way! Where'd you learn that? I figured it was a performance, or performance vs. cost issue. Not to mention weight.
    http://audioheritage.org/vbulletin/s...8782#post38782
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  7. 01-09-2007, 01:20 PM #37
    Zilch
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    BB6P model 4688 now appended in post #31, above.

    Here's an unverified version 4685 for 15" woofers; never had one to actually measure, tho. Response w/2226H pair.

    Compare to original w/2225H specs:

    http://www.jblpro.com/pub/obsolete/4685.pdf
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  8. 01-09-2007, 02:22 PM #38
    subwoof
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    horses mouth

    I spoke with Mark Gander at the 1997 NAMM show ( ORIGINAL tent sale ) about these. That's where I bought the three of them.

    There is no love for Dr Bose in northridge....



    sub

    Originally Posted by Zilch
    They dropped them because of a Bose patent infringement allegation.
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  9. 01-09-2007, 02:33 PM #39
    John
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    Hi Subwoof do you still have those cabinets?
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  10. 01-09-2007, 03:07 PM #40
    Zilch
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    http://cgi.ebay.com/2-JBL-4688-Subwo...QQcmdZViewItem
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  11. 01-09-2007, 05:11 PM #41
    loach71
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    Quote Originally Posted by Zilch View Post
    I believe I paid $400 to hav e it shipped across the country.

    The ports are 8" diameter, not 4".
    Thanks for the screen shots Zilch. I plugged in you values and the ports made sense. The darned software must not like me Time for some Jack Daniel's to clear this mental fog...

    Then it's tablesaw and router time... sober -- of course!
    Amazed I'm still alive!
    Tim
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  12. 01-09-2007, 05:37 PM #42
    4313B
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    Quote Originally Posted by loach71 View Post
    Time for some Jack Daniel's to clear this mental fog... Then it's tablesaw and router time...
    Yee Haw!!!

    Quote Originally Posted by loach71 View Post
    sober -- of course!
    Oh... I thought we had a new home video brewing there for a moment...
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  13. 01-09-2007, 05:55 PM #43
    loach71
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    I name the enclosure the 'DAISY DUKE" twin 45's heh heh heh

    Quote Originally Posted by Giskard View Post
    Yee Haw!!!

    Oh... I thought we had a new home video brewing there for a moment...

    Well gosh, golly, gee -- I guess my Yew-All Southern heritage has shown up agin! My Montana buddies always thought I was more right-wing than them.

    I'm going to change the design a tad -- the internal dimensions will stay about the same, but I will be using 2.25" wall thickness -- .75" Baltic birch plywood laminated to .75" MDF laminated to .75" Baltic birch plywood. That should make a box with stiff enough walls and high enough wall resonance frequencies. They will also be theft proof - except for Paul Bunyan.
    Amazed I'm still alive!
    Tim
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  14. 01-09-2007, 06:03 PM #44
    4313B
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    I name the enclosure the 'DAISY DUKE" twin 45's heh heh heh

    Sounds good to me!
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  15. 01-11-2007, 08:04 PM #45
    loach71
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    Work has started

    I've started laminating the .75" baltic birch plywood and the .75" MDF.
    Looks like 2 sheets baltic birch and one sheet MDF per enclosure..
    They will be heavy suckers. Ohh my acheing back. Thank god for 4" casters..
    Plans are to run one BGW 750C per enclosure.... I have a few of these
    amps just lying around -- don't want them getting lazy!

    Amazed I'm still alive!
    Tim
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