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  1. Replies
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    pos, I think we actually might be in agreement,...

    pos, I think we actually might be in agreement, our differences residing in the terms in which we argue:

    If you read my argument, I'm sticking to a constant displacement, ie 1mm.

    PV=pressure...
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    thanks for the input Ian, I reckoned that the...

    thanks for the input Ian,

    I reckoned that the single 2118 could just about keep up with the double 136a's. Max spl is a close match.

    Impedances etc are not an issue, I have six Crown gradient...
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    Hello again, thx for the replies, yesterday...

    Hello again,

    thx for the replies, yesterday our 4yo kid woke us up in the middle of night, so I did some more thinking:

    1. Using two drivers definitely adds 3dB efficiency compared to a...
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    Thanks for the answers, but, no, I still don't...

    Thanks for the answers, but, no, I still don't get it.

    Exemplifying again: take a 90dB/1W driver, feed it 2W, you get 93 dB. Take two drivers, feed them 1W each (coherent) and you get 96dB for...
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    Double 136a's with single 2118?

    Hello Lansingheritage,

    I started building speakers just 3 years ago, so I'm still a rookie struggling with the basics. Here's two interrelated questions:

    Q1. I've got four 136a's and a pair...
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    Everybody, thanks for the help. Boputnam:...

    Everybody, thanks for the help.

    Boputnam: nice pictures, thx, this might be exactly what the seller was talking about.
    I had the definite impression that the 2245H was not being produced...
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    2245H help needed urgent ebay

    Hello JBL specialists,

    I've bought one 2245H NIB on ebay. The seller is now offering me a 2nd one in new condition, but this one he says has ribs all the way down to the dust cap. AFAIK the ribs...
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    Are 2118 cones soft?

    Hello all,

    The cones of the 2118's I just received are very soft and flexible.
    With a finger I can push the cone out of shape; it then returns to its normal shape by itself.
    Is it normal for...
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    Hello sub, thx for your effort. I make that angle...

    Hello sub, thx for your effort. I make that angle arctan((.98-.68)/(2 x 2.025))=4.24 degs. Hmm..., even worse than the 5 degs I've estimated earlier.

    Hey, with those german-skills I bet you could...
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    Hello there, rob, thanks for the links and...

    Hello there,


    rob, thanks for the links and your interest, I'll also try madison and rec.audio.tech before bothering Mr Edgar.
    About the horn size: the cabinets are already built, I can only...
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    Hello guys, thanks for the input, ...

    Hello guys,


    thanks for the input,


    rob, I'm arriving at the same conclusion as you, regarding the horn/driver angles: most people simply blissfully ignore the problem, and sometimes it...
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    Hello guys, frank: OK, I was wrong wrt the...

    Hello guys,

    frank: OK, I was wrong wrt the 2440, it's tapered allright. I have already measured the 2445 using a steel ruler and a graded drawing arc, this is reasonably accurate. However, this I...
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    Thanks for the input, ROBH3606 - Alas, if only I...

    Thanks for the input, ROBH3606 - Alas, if only I had a 2327.

    But: the 2327 is 105 mm long. According to Pythagoras, if it were straight-sided, then its angle would be 6.56 degs, to convert between...
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    2426 2445 tapered throats

    Hello JBL savants,

    I'm putting my 2426 and 2445 compression drivers on home-made wooden tractrix horns.
    The throats of the drivers are tapered: on the 2445 it's visible, on the 2426 the mesh...
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