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Thread: BIG monitors

  1. #1
    Alex Lancaster
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    Question BIG monitors

    As posted elsewhere, I am building big monitors on the line of 4350/5's, but with 2245H's (18" inch), as far as the tweeters, on the thread 2404 vs 2405, the 2405 seems the best idea, I'll try both anyway.

    I would like Your valued opinion on using 2311's with 2308 plastic lenses, or 2382's, I have the former, but have not found the 2382īs in cheapbay.

    The speakers will be about 12', 4 meters for us metrics, away from my ears.

    Tomorrow I'll go to the cabinet maker and take pics of progress. He only started 2 months ago so maybe He'll have the inside perimeter, they are being built from the inside out, bracing first.

    Thanks:

    Alex.

  2. #2
    RE: Member when? subwoof's Avatar
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    Try this for horns...

    Hey alex - you bought some stuff on ebay from me awhile ago..

    Instead of using the 244(X) drivers on the 2311/2308 or 2382 I would suggest the 1.5" driver 2451J with the 2332 90 degree horn.

    This will take up little baffle area, have BOATLOADS less distortion, and since you already *have* 12's underneath and slots above, the horn can be real small.

    It is ALMOST time aligned with the original 2311 horn...

    Sure beats the 1/2 mile long distance from phaseplug to horn flare on the 2382....!!

    subwoof

  3. #3
    Alex Lancaster
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    Smile

    Subwoof:

    You meet the nicest people on the LansingH country club.

    Wouldnīt the 2311/08 have more lateral coverage?, the distance is real short, I know.

    Thanks:

    Alex.

  4. #4
    RE: Member when? subwoof's Avatar
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    2311-2332

    Well the 2311 / 2308 is supposed to be 90 or 100 wide depending on what jbl print you read and the 2332 ( used in the DMS-1 and Array series, is 90.

    So it's a tossup there but given the choice, an immediate horn flare on the phase plug ( vs at least 7" of throat ) and the absence of obstructing plates makes for a less distorted/less obstructed pathway for the critical high-mid region and no "lobing" effect from the plates.

    But I would do an A-B on this - perhaps the older diaphram / lens assembly has that warmth that makes the monitor so nice sounding!

    BTW - you could use the 2450SL diaphram ( coated 2445 titanium ) to mimic the aluminum rolloff and REALLY smooth out the resonance peaks. This is the driver in the DMS-1 and ARRAY.

    sub

  5. #5
    Senior Member herve M's Avatar
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    Hello,
    I use 2332 horn with new 2430 compression driver.
    Here :
    http://www.audioheritage.org/vbullet...s=&threadid=40

  6. #6
    Senior Seņor boputnam's Avatar
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    Hey...

    I've not the experience with CD's and differing throat/horn configurations that some do here in the LansingH Country Club - specifically Giskard, Widget and Earl K to name but a few - but this Link: JBL L300 vs 4343 Link will take you to an interesting discussion on the 2421 CD and its Al diaphram that is worth a read.

    As well, you might try the "underused" Search button for your CD and throat/horns, and see what is unearthed.

    Good luck!
    bo

    "Indeed, not!!"

  7. #7
    Alex Lancaster
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    Smile

    At Last:

    3 images of the project, which by now should be called "decade", that's how long itīs taking.

    First we built the bracing out of 40mm pine, it now has more than the pics show, and You can barely make out the cutouts glued and screwed to the rear side of the 18" cabinets, then the sides built from 1/8" plywood glued to 1/2" thick slats, glued and screwed from the inside out, so as not to bother covering the screw heads.

    The corners are solid wood, and everything was clamped while the glue dried.

    I put holes for binding posts for each driver; the x-overs will be on the outside; I have 3pr of 3107īs, so I can fool around using them: as they come, caps bypassed, and charge coupled; I also have electronic ones, so I can really complicate my life.

    I will post more pics later.

    Alex.
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  8. #8
    Alex Lancaster
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    pic 2

    pic 2
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  9. #9
    Alex Lancaster
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    pic 3
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  10. #10
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    Thumbs up

    Looks nice Alex !

    regards <. Earl K

  11. #11
    Tom Loizeaux
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    Wow, you've got a good looking project there. It's clear you're committed to puting together a very nice set of speakers!

    Though I suspect that the previous posters may be correct that the new horns are cleaner, I've found that the classic JBL round horns, like the 2312 and 2307s, when loaded with the 2420s and fitted with the 2308 slant lenses, sound great! I find the dispersion quite wide and even and don't have any problem listening to them for extended periods. Aparently JBL liked them too, because they used them on numerous studio monitors for quite some time. They were standard on their most expensive Pro studio monitors...so I don't think you'd go too wrong if you chose to use these.
    I think I'd use the "Dolly Partons", before I'd go to the CD horns in a home listening or small studio situation.
    Just my opinion.

    Tom

  12. #12
    Senior Seņor boputnam's Avatar
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    Hey, Alex...

    WOW!! :shock: I'm thrilled with what (I think...) you're doing. Twin 2245H's each side? What are you, nuts!?? Or, is that a single "center" ULF section...?

    Interesting linear array of the "high-end", and your deciding to put the 2405 atop the 2445, rather than side-by-side. What was the decision tree for that?

    The wood grain looks like it will finish gorgeous. Any money in the budget for a roadtrip by Audiobeer?
    bo

    "Indeed, not!!"

  13. #13
    Alex Lancaster
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    Smile

    Youīre thrilled (You think that I think I know what Iīm doing, the shadow knows)

    Total per side:

    2 2245H's, separate 280 liter enclosure each 20-200Hz (letīs see)
    1 2202H 35 liter enc. 200-1100Hz
    1 2445J, 2311, 2308 I'll try 2446 and 2451? diaphs. 1.1-9 KHz
    1 2405H 9^^kHz

    1 channel of Crown K2 for 2 2245H's
    1 Sony N77ES bridged one side and 1 N80ES, the other, they are almost identical.

    X-overs 5234īs, M553, whatever sounds best. Iīll need Your help later.

    3107īs as described before.

    Nuts??, of course.

    Since the smaller cabinet is aimable, I guesstimated the vertical array would give me better position, at the expense of being too "focal" Weīll see, The 2245īs cabinets will not be very "aimable", I have enough friends though; From previous advice from these revered pages, I can put the ports up or down, (more sixpacks, or cases of Tequila or both).

    The finish will only be prepped linseed oil, no lacquer, but already coated inside with Pentaclorophenol, great for debugging, kind of Hazmat.

    I donīt think I can afford Audiobeerīs work, He should be making Paragons, and ship them west, so they'll get east.


    All ideas very welcome.

    Alex.

  14. #14
    TimG
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    compression driver recommendations

    I second the recommendation for the JBL 2430 Aluminum compression driver. This is about as close as you will probably get to the driver used in the new K2 speakers and it is supposed to be one of the lowest distortion compression drivers that JBL has ever built. The 2430 is available for around $220 and I saw that the 2332 is available for $68. Just a diaphragm for a 2445 or 2441 costs almost as much as the complete 2430 driver.

    I'm thinking about a similar 4355 project with a pair of 2235H, a 2020H, and a BMS 4590 coaxial compression driver. I have a pair of 2380 horn but I may go with a smaller horn. One of my 2020H was damaged in shipping so I'm waiting for a UPS check.

  15. #15
    Alex Lancaster
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    Smile

    I already have all of the stuff, including the diaphs., I also have NIB TOA 2" throat, 2.8" VC drivers, they will be tried, at the risk of being defrocked here; I can get as loaners Altec 288īs and 511 horns, but I do not like the idea.

    If I run into 2430 and 2332's, like on cheapbay, I'll get them.

    Alex.

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