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Thread: 4505 Wx

  1. #1
    RIP 2011 Zilch's Avatar
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    Arrow 4505 Wx

    O.K., see the pic for 4505 WX.

    They came loaded with 2420's which is LE85, no? (16 ohm)

    And 2216, which is LE15B? (8 ohm)

    And the switched attenuation crossover shown, which is what?

    If all of that, they're pro-equivalent L200's, I'm thinking. Didn't JBL make that model complete by some other designation? Wondering why these were assembled this way instead.

    Finally, I have 3106's and 2402's I can use to upgrade to 3-way. That gonna work OK just by slappin' them in there? Problem being the mid attenuation will cut the HF concurrently. Guess that happens with all of them stacked dual xover schemes, tho. Was there an equivalent 3-way monitor as well?

    Yes, I did follow the L200/B thread, but this combination wasn't addressed, and I thought it might be of separate interest here....

    Maybe THESE be the ones to "Biradialize" with 2344A's? Recall I HATE honkin' L200's!

    [Bass is phat, tho....]
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    Last edited by Zilch; 10-10-2004 at 05:04 PM.

  2. #2
    RIP 2011 Zilch's Avatar
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    Mystery Xover:

    Ooops! Excuse them loose wires, please. That was me trying 3105's in lieu of 3106's, if I recall....
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    Last edited by Zilch; 10-10-2004 at 04:43 PM.

  3. #3
    Alex Lancaster
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    Smile

    Donīt bother with the 2402's, unless You love 15KHz, get some 2405īs.

  4. #4
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    It seems to me that in your picture the slant plate is up-side down.

  5. #5
    Administrator Mr. Widget's Avatar
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    You do have a rare animal there! That speaker must pre-date the short lived 4325. It is a Pro Series L200, not L200B. The L200B was a 4330 but with the shorter horn as used in the 4320. I bet the 4505 WX was the model designation for an empty walnut studio monitor enclosure ca. 1970 or there abouts.

    2216 is a 4-6ohm woofer.

    I would guess that your mystery crossover in a Pro Series LX16 with the pad switch put in the crossover enclosure instead of the cabinet.

    Have you opened it up? I bet it has the 2307 instead of the 2312.

    Widget

  6. #6
    RIP 2011 Zilch's Avatar
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    Originally posted by Mr. Widget
    Have you opened it up? I bet it has the 2307 instead of the 2312.
    Actually, itza pair. A very rare pair, seemingly. The mate has it's back to you there. Indeed, the label says "4505WX Enclosure."

    It's the long horn, like H91; gotta make some room to open them up to see the model for sure. I did remove the crossover; 3122, it says, "JBL Professional" foilcal on the side.

    Also dug around for the crossovers to add on. Old 3106's (8000 Hz for use with 2420) say VHF driver should be 16 Ohms.

    Old pair of 3105's , (7000 Hz) say 12-16 Ohms.

    Newer pair of 3105's say 8 Ohms.

    All say MF driver 16 Ohms.

    Pffftttt. Read somewhere that these, like N7000 are "special" in that they work with either 8 or 16 Ohm VHF. Now I gotta RESEARCH!

    No 16-Ohm 2405's just layin' around here, alas.

    The lens is on with velcro. I flipped it, in the interest of purity, as requested above....
    Last edited by Zilch; 10-11-2004 at 05:43 PM.

  7. #7
    Alex Lancaster
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    Long horn is H92.

  8. #8
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    http://audioheritage.csdco.com/vbull...ighlight=N8000

    The 3122 (LX16) was used in the 4325 with the 2216, 2420, 2307/2308

    Same load out as the original L200 (LE15B, LE85, HL91, LX16)

    All 077/2405 ring radiators are the same impedance, ignore the foilcals.

  9. #9
    Administrator Mr. Widget's Avatar
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    Zilch,

    We have covered this a couple of times in the past, but there is essentially one impedance for the 2402 (075) and one impedance for the 2405 (077) even though the foilcals have stated either 8 or 16 ohms depending on vintage. Same is true for some woofers... it can get rather confusing.

    Widget

  10. #10
    RIP 2011 Zilch's Avatar
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    Alrighty, then,

    Brief mention of the 4325 on the last page of the 4320 brochure, circa 1972.

    Apparently, there was a mandatory upgrade required for the 3122 to 3122A, same as LX 16. Will stacking on the 3106 with its additional attenuation obviate the necessity of changing Cx and Lx as shown? Previous owner(s) didn't smoke the 2420's as they are still working with original seals.

    Does "ignore the foilcal" apply to current production 2402H and 2405H as well? I believe I recall now that they are all the same, and should work with this combination of crossovers.

    That's a REALLY long horn there. Mid's gonna be just coasting from 1200 - 8000 Hz.
    Last edited by Zilch; 10-11-2004 at 07:32 PM.

  11. #11
    Administrator Mr. Widget's Avatar
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    Yes ignore the foilcal for the H series too as they haven't changed them except for the magnetic material, and no they are not the same. The 2402 (075) takes the D8R075, the 2403 (076) takes the D8R076, and the 2405 (077) takes the D16R2405.

    Widget

  12. #12
    Administrator Mr. Widget's Avatar
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    If you are going to keep these, you may want to read Infredible's and Bo's comments.

    http://audioheritage.org/vbulletin/s...&threadid=3455

    Widget

  13. #13
    majick47
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    2405 Tweeters

    Re the recommended 2405 tweeters does it matter if they are 8 ohm or 16 ohm for planning L200b upgrade with 3106 crossovers? Rich.

  14. #14
    RIP 2011 Zilch's Avatar
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    Re: 2405 Tweeters

    Does it matter if they are 8 ohm or 16 ohm for planning L200b upgrade with 3106 crossovers?
    Check Giskard's and Widget's posts above. It doesn't matter, not even with new production. They are all the same actual impedance, apparently....
    Last edited by Zilch; 10-12-2004 at 09:55 AM.

  15. #15
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    Zilch, these kind of look like what got me started in this whole JBL thang...... Only mine were the 4325 with 2420(LE85)/2307/2308 and the 2216 boomer woofer. Anybody want buy a pair of 2216's?

    The xover looks like mine too, a 3112 I think it is, not sure - I am at the office right now. It was definitely a 1200 Hz cutoff though. My cabinets are 4505 too, but they were light "utility" gray.

    I built integral bases for mine to get the horns up to ear level, reinforced the bottom, back and top, then dropped in an S22-2 line up, alnico 2235, 2441 (aluminum)2311/2308, 2405H and use a 3 way passive network that Giskard conjured up and posted here as a voltage equivalent to the 3133 network that doesn't need a tapped inductor.

    I wanted to mirror image the tweeters and needed to seal up one of the vents so I used an 11 gauge steel plate that also serves as a finishing plate for the new 2405 hole (since I had a heck of a time cutting a 3 and 3/32" hole in wood!

    Besides the tweeter holes were drilled for three mounting screws for the 075 and needed to be covered up.

    I haven't yet tuned the remaining vent but it's probably a moot point in my system, since I actively cut the cabinet off at 100 Hz/6 dB/octave.

    In short, there is lots of potential to have some fun. Being an unskilled wood worker, the boxes were very convenient to try different ideas.
    Last edited by Chas; 10-13-2004 at 06:42 AM.

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