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    By 'acoustic coupling', I take it that you're...

    By 'acoustic coupling', I take it that you're referring to the coupling taking place in the airspace immediately in front of the woofers? I suppose that that could be . . . but for some reason I...
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    Well, the main reason is that the old system had...

    Well, the main reason is that the old system had four 15" drivers per side, so the new system has . . . four 15" drivers per side. It did occur to me to halve the number of D130s, but once enough...
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    So now I'm building crossovers. I originally...

    So now I'm building crossovers. I originally thought that I would use 2nd-order filters, but after taking some measurements and playing around with a couple of different active crossovers I have...
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    The End is Near

    Finally, all of the cabinetry is completed, and most of it is installed, including the speaker cabinets. Couldn't be happier with the results . . . especially the perfect 1/4" gap all around the...
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    Ported if it's JBL

    For the original question in the context of this forum . . . what traditional JBL 15" drivers will work properly in a sealed box for home hi-fi use?

    Okay, so maybe there's something newer in the...
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    Maybe some lenses?

    An old custom system I took apart recently had some L300-style (HL91?) lenses in front of the 075s. I never did hear this setup with properly-working 075s . . . but it seems like it might work...
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    :rotfl: They look absolutely stunning in their...

    :rotfl:
    They look absolutely stunning in their final position on either side of the fireplace . . . wow. Are you using the bass bins with them here, and they're just not shown?
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    [quote=oznob;208606]Or, if the cat uses your...

    [quote=oznob;208606]Or, if the cat uses your speaker grills as a scrathcing post,:die:...........quote]

    Nah. Don't want to hit the speakers. Plus, . . . the cat came back . . . the very next...
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    I have had some success with a commercial aerosol...

    I have had some success with a commercial aerosol cat repellant . . . you can remove the grilles and spray them very lightly. I also keep a cardboard scratching block right next to my speakers --...
  10. The problem with the 'how much bandwidth is...

    The problem with the 'how much bandwidth is enough' question is that transition-band behavior and in-band transient response are fundamentally joined at the hip . . . in particular, I remember the...
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    So, forgive me, I've never seen one of these. Is...

    So, forgive me, I've never seen one of these. Is it basically a domestic double-woof 4311? By your measurements, it seems to be best used as driver donor . . .
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    Pink elephants seem to follow around many...

    Pink elephants seem to follow around many chemicals that have 3-letter acronyms . . . :cooked:
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    Yeah, the L-Pads were crackly, and when the 075s...

    Yeah, the L-Pads were crackly, and when the 075s were tested later, one side was kinda krispy, and the other side had very little output . . . as far as the trace is concerned, there was unlikely to...
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    Hi John . . . I'd be really interested to see the...

    Hi John . . . I'd be really interested to see the article you describe, and I'm sure the homeowner would as well. By "the same guy", are you referring to the the dealer, David Beatty?

    Beatty is...
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    It's exciting to see some progress -- we did...

    It's exciting to see some progress -- we did quick mockups of all the cabinet panels and drivers today to ensure that everything fits. There are some pretty crazy angles on the low-bass cabinets . ....
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    :jawdrop:A great reminder of the debt we all owe...

    :jawdrop:A great reminder of the debt we all owe to little tinkerers that worked much like this in the very early 20th century, and gave us the foundation of the technological society we enjoy today....
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    And here are the plans for the new place. I...

    And here are the plans for the new place. I worked extensively with John at Slice Speaker Repair in Kansas City to come up with the revisions . . . he's been an authorized JBL rebuilder for a couple...
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    So here are photos of the electronics. The...

    So here are photos of the electronics. The Marantz Model 2s are mounted in the basement, the rest in the cabinet at the opposite end of the room. The turntable is a Thorens TD124 with a SME 3009 and...
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    I found a bit more original-era documentation for...

    I found a bit more original-era documentation for the system - attached is the dealer's newsletter that highlights the system, from 1968.
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    Hi Maron . . . it was Beatty who sold and...

    Hi Maron . . . it was Beatty who sold and installed this system. He and the original owner (Dr. Blender) were close friends.

    Okay, here are some pictures of the inside. The flash makes the...
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    I'll dig up some interior pix soon and post them....

    I'll dig up some interior pix soon and post them.

    But here's how it sounded right before it was dismantled . . . the 075s were intermittent (just look at the L-Pads!) and the traces were taken...
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    New digs for a classic system

    Hello all,

    This project is just so much fun, that I have to share it. Add to that the fact that this website has been so much of a help . . . here goes.

    I have a client who owns a complete,...
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