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Thread: Quick & Dirty 4430-Inspired Two-Ways Part I

  1. #301
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    I'm curious - 'anyone know the difference between the 2418H and 2418H-1? They definitely have their own specific diaphragms. I'm wondering if the -1 series is the ruggedized version, (like the 2404H-1), resulting in slightly less HF extension, (like the 2404H-1). I've got the plain 2418H series in my little MR922's, but haven't done any objective testing, and 'nothing comparable here to compare them with...

    John

  2. #302
    RIP 2011 Zilch's Avatar
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    John, we're in "undocumented" territory here, apparently. All's I know is that 2418H is more expensive than H-1.

    2404H-1 merely used the 2402 diaphragm. I have some 2404H-2, also undocumented.

    When Mr. Widget and I opened a pair up to make 076's outta them, they also had 2402 diaphragms. STILL don't know what else is different about them....

  3. #303
    Administrator Robh3606's Avatar
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    "I'm curious - 'anyone know the difference between the 2418H and 2418H-1?"

    Hello John

    The -1 uses ferrofluid in the gap I think the 2418 didn't

    "I tried them with 4425 crossovers, and there was nothing above 16 kHz, if I recall. Odd, since 2416H plays up there fine."

    Hello Zilch

    Well that sucks!!! I was considering swapping the 2214's for 128h-1's to try an L200t3 type speaker or a "super" 4412 in a bigger cabinet to put upstairs in my den in a second HT set-up. As usual I don't know what the hell I am doing until I actually start building them . Anything in the post from downunder??

    Rob

  4. #304
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    Rob: No package here yet, alas....

    Test out the 2418H-1 and let us know what you find.

    I'll run one on N3134 here, set "0."

    O.K., on PTH waveguide, not so bad, actually. 4430 curve is obviously wrong for it; too much boost too early. I'm glad you made me check again. It opens some more options.

    Read somewhere that ferrofluid squelched VHF response. Not here, apparently:
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  5. #305
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    Somewhat better on AM crossover we're using with 2431's. "Too much boost too early" was my cue to try it.

    Curves are identical below 4 kHz. Use original AM schematic R1 and L4 to punch 9 kHz notch back up, probably:

    [Edit: Second unit virtually the same. Kinda exciting, actually. Inexpensive 2418H-1 can substitute for 2431H in "budget" system, maybe. Lessee, is there some L56's in the dungeon? ]
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  6. #306
    Senior Member Guido's Avatar
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    Quote Originally Posted by Zilch
    I tried them (2418) with 4425 crossovers, and there was nothing above 16 kHz, if I recall. Odd, since 2416H plays up there fine.
    Interesting...

    Here are my results. Compared a 2418H-1 with a 2416H-1 in a 4425.
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  7. #307
    Senior Member Guido's Avatar
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    Quote Originally Posted by Zilch
    What's that crossover for? Not a product I'm familiar with, L200t3 apparently....
    Pic courtesy of Rob

    L200t3
    General Section•Recommended Power Amplifier Range: 200 watts, per speaker•Nominal Impedance: 8 ohms•Woofer: 12" paper cone•Tweeter: 1" pure titanium compression driver•Frequency Response: 42Hz - 20kHz•Crossover Frequency(ies): 1.2kHz•Sensitivity: 93dB (1 watt/1 meter)•MSRP U.S.: $999.00 each
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  8. #308
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    Thanks, Guido and Rob. How a lovely two-way like that, particularly a Biradial one, slipped under the Zilchster's radar, I don't know.

    I'll definitely try those crossovers now, as Giskard suggested.

    I was WAY wrong on my initial evaluation of 2418H-1. Thankfully, y'all inspired a second look....

  9. #309
    Senior Member Guido's Avatar
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    Quote Originally Posted by Zilch
    How a lovely two-way like that, particularly a Biradial one, slipped under the Zilchster's radar, I don't know.
    Take the eyes from that avatar



    Quote Originally Posted by Zilch
    I'll definitely try those crossovers now, as Giskard suggested.
    I ran it in my spice program. It produces a similar curve than the N3124 while being much simpler.

  10. #310
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    Parts for NL200t3 crossover ordered, then.

    Here's the parts list for the combined AM/N3134 crossover Guido and I propose to use with 2431H on PT waveguides and 2235H. Seems with adjustment of the notch filter, it could also work with 2418H-1 as "budget" mid/high driver (see above). Right click the spreadsheet and "Print Picture" for a hard copy.

    [I'm listening to that combination on factory crossovers now.... ]

    Edit: In comparison to the LE85's I'm used to of late, 2418H-1's are "crispy."


  11. #311
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    Hey Zilchy, this thread has been a blast, but that avatar is really something else!

  12. #312
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    They're the Biradial horns poster girls.

    [Giskard made me do it....]

  13. #313
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    Time alignment.

    Any advice how far forward I should move the waveguide? Allegedly, the voice coils should be in alignment. There's some leeway in this, I'd think, as the woofer voice coil is at least 4X the depth of that of the compression driver. I've aligned the mounting surfaces of 2431H on PTF waveguide and 2235H here:
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  14. #314
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    O.K., now for the DIRTY part:

    1) PTF gasket indicates there's not gonna be much baffle left here, so I lay out the smallest practical hole that will accommodate the waveguide. If I moved it forward, it could be smaller.

    2) 1" hole saw gives a generous radius on the corners, preserving baffle for support.

    3) Four corners complete.

    4) The dirty deed itself. MDF is old, dry, and hard. Go slowly, Zilchster....

    5) But, will it FIT?
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  15. #315
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    6) Of COURSE!

    [10 mounting screw holes and T-nuts per waveguide. ]

    7) Play ON, lovely cabs, you have new life....
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