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  1. Replies
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    Addendum

    Regarding a 24 hz Fs driver being sort of a waste to load in the A7 horn box.

    To illustrate this point analogy is made here to a number of older JBL woofers being provided with quite low Fs, even...
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    The Altec 416-8 B & C versions

    Members may have noted that in my previous post i practically didn't say anything about these often used drivers in the A7. This wasn't an oversight, i thik these woofers require more than a line of...
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    The Powered Altec A7 style cab

    This horn loaded Powered Altec 1209B is part of their Sound Reinforcement arsenal. This type of enclosure isn't intended for ultra low bass, its mainly designed for high output, more so when...
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    patallen, The mass issue with DATS has been...

    patallen,

    The mass issue with DATS has been with us for a while now. A way to bypass the problem and getting an idea is to do your usual routine in DATS, BUT SKIP the weight step causing causing...
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    RE Mine looked like that a few years ago I just...

    RE Mine looked like that a few years ago I just use a damp terry cloth rag and very carefully wipe the rubber. They look like this now. I did Google EPDM Cleaner and found the following - My advice...
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    MoD, RE "LE 15 spider has (I think) less...

    MoD,

    RE "LE 15 spider has (I think) less stiffer spider"

    True, but it applies to spider and surround. The LE15A Vas parameter of 736 L represents a large volume of air and as such it is more...
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    The unidentified woofer doesn't appear to come...

    The unidentified woofer doesn't appear to come from the same mother (lol), and even the GPA 416-8C as well as the 416-8B have no back vent...
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    Alex, You need to know for sure what you have...

    Alex,

    You need to know for sure what you have on-hand before thinking about any loudspeaker cabinet. This is essential since woofers don't usuallly go into any box that crosses your mind, if you...
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    Hi Alex, RE "Want assembled altec 19 or other...

    Hi Alex,

    RE "Want assembled altec 19 or other model . Cannot find plans for 19 . Can you help me ?"

    Unfortunately, after checking i don't have a true Altec # 19 cabinet plans, though i've got...
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    MoD, RE LE15A recone in E145 basket I don't...

    MoD,

    RE LE15A recone in E145 basket

    I don't intend to rain on your project, i assume you know what you are doing and the risks involved.

    This is a "unorthodox" mix you are trying to achieve,...
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    Alex, I have many Altec plans, but i need to...

    Alex,

    I have many Altec plans, but i need to check in my stuff if i have one for model 19 or close to. Maybe i have something.

    I don't have time for this right now but i'll look into this...
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    Hi Spellcaster, I have most of the info the...

    Hi Spellcaster,

    I have most of the info the for the JBL D/K/E series, however the older the drivers are (e.g. D series) the lesser spec sheet details available.

    For all JBL MI woofers the most...
  15. + 1 e.g. since you require a 12" and very low...

    + 1

    e.g. since you require a 12" and very low bass you might want to look at the Dayton Audio offering. A quick search on Dayton's site has shown various models available for that size and duty.
  16. Thread: Jbl sr4715a

    by RMC
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    MoD, I forgot to mention the following in my...

    MoD,

    I forgot to mention the following in my previous post.

    Don't be surprised by the cab you were considering. There's a number of PA and SR cabs having an F3 bass "cutoff" in the 50-80 hz...
  17. Thread: Jbl sr4715a

    by RMC
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    Hi MoD, The -10db is likely applicable at both...

    Hi MoD,

    The -10db is likely applicable at both frequencies indicated considering the way its presented in the SR series brochure.

    The cab is loaded with two 2226H (in paralell therefore 4...
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    Based on my JBL drivers listing 128H is 12"...

    Based on my JBL drivers listing

    128H is 12" black, Aquaplas on cone

    128H-1 is 12" black, with black Aquaplas on the front of the cone

    As for passive radiators there's a bunch of them:...
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    Bedrock, Other good reasons to go with the...

    Bedrock,

    Other good reasons to go with the L100T in your case.

    Your intended use fits more with an Hi-Fi application than control monitoring.

    Going with the 3-way you'll enjoy lower...
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    As an example this is plastic mesh, actually just...

    As an example this is plastic mesh, actually just under one mm openings. The picture shows increased size.

    Large enough to let air in and out the back vent, but small enough to keep the unwanted...
  21. Thread: Jbl 4520

    by RMC
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    The 4560 and 4550 type cabs, front loaded horns,...

    The 4560 and 4550 type cabs, front loaded horns, lived some years longer than 4520 in the JBL catalog (in 1986 they're still there in 46XX series). Most probably because they were long throw units,...
  22. Thread: Jbl 4520

    by RMC
    Replies
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    I've never seen a JBL MADE AND APPROVED 4520...

    I've never seen a JBL MADE AND APPROVED 4520 style cabinet with two 18". Not even a genuine documentation regarding such cab with a pair of 18". In my book it simply doesn't exist, although DIY may...
  23. We don't disagree on thinking out of the box...

    We don't disagree on thinking out of the box here, nor on "what the hell why not give it a go?" But i forgot in my view an even more important aspect.

    RE Any speculation as to what I might gain...
  24. Hi Riley, The 2226 EBP of 121 is much higher...

    Hi Riley,

    The 2226 EBP of 121 is much higher than normally prescribed for a sealed box (EBP around 50). That data alone doesn't tell everything but its a clue among other items below.

    In the...
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    RE building an 18 box, with the specifications of...

    RE building an 18 box, with the specifications of not exceeding the size of the 809, question of space

    Fitting an 18" in a 65 liter (2.3 cu. ft.) box is rather optimistic, even more so if one is...
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