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Thread: JBL Master Reference Monitor

  1. #1516
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    Quote Originally Posted by pos View Post
    The lpad and cap in the M2 passive network is aimed at a 20 ohm load, so that is probably the average load of the unit in the frequency range of interest.
    Also note that this lpad eats 9dB so you cannot go away with a low power amp and you will basically divide its 20 ohm max output power by 10.
    I'm looking at the possibility of using an amp that can deliver 60wpc into 8ohms. By my reckoning that's an output of about 22v. Into a 20 ohm load that would be 24wpc. If I divide that by 10 then it gives me effectively 2.4wpc. If the CDs have a sensitivity of more than 100dB then that should be more than enough. Have I got that right, or am I missing something?

    PS. The 60wpc is not the max power output.

  2. #1517
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    D2 availability?

    Are D2's available now?

    Thank you

  3. #1518
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    They have been in the past. Call and find out.

    http://reconingspeakers.com/product/...l-m2-5032754x/

    Any other JBL repair shop should be able to tell you the same.

  4. #1519
    Senior Member Flodstroem's Avatar
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    Quote Originally Posted by pos View Post
    For those hesitating about spending $80 for a pair of the original metal logos, here is an alternative:
    http://www.ebay.fr/itm/M-JBL-Logo-JB...3D151692053521

    It is 3cm square and should fit the M2 horn.

    Attachment 65565

    I will ask the seller if he can do a silver version and keep the thread informed.
    It should be doable as his shop already has silver and gold Bose logos:
    Attachment 65566

    Hello POS!
    Do you know anything about this seller and what has happened ? It looks like he has cancelled the listings?
    Flodstroem

  5. #1520
    Senior Member pos's Avatar
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    Hello Flodstroem

    I don't know

    At some point he told me he would make a silver version to match the original one, but he never did.
    That said I am not sure a plastic silver logo would look right.

    Anyway, maybe you can ask sebackman as he ordered a few pairs of the black version and I think he was quite happy with what he got.

  6. #1521
    Senior Member Flodstroem's Avatar
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    OK thanks POS.

    I will try to take a contact with the seller and see whats the answer is.......

    sebackman, if you have them, im interested for a pair as well
    Flodstroem

  7. #1522
    Senior Member baldrick's Avatar
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    Really don't know what too say...
    Attached Images Attached Images  

  8. #1523
    Senior Member srm51555's Avatar
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    Nice...Master Fur Monitors! Are those yours?

  9. #1524
    Senior Member baldrick's Avatar
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    Quote Originally Posted by srm51555 View Post
    Nice...Master Fur Monitors! Are those yours?
    Nooooo way Just found a picture, don't know what it is, probably an pimped up version of org M2.

  10. #1525
    Senior Member grumpy's Avatar
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    ...
    [Space Ghost]
    Zorak upside down
    [Zorak]
    Sing it, fuzzy
    [Brak]
    I'm a little teapot short and stout
    [Space Ghost]
    It smells like
    [Group]
    (???)
    ...

    (yeah, it's that kind of day)

  11. #1526
    Senior Member hsosdrum's Avatar
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    That... just makes me SOOOOOOOOOOO sad.

  12. #1527
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    Just heard these for the first time on Thursday. What a remarkable speaker. I never heard such a detailed and revealing top end, that absolutely never sounded edgy or harsh, regardless of listening level. Huge, consistent soundstage with a smoothness I've never heard before from a horn loaded compression driver speaker. Now I know why everybody raves about these things. Does anybody not like these things? In my limited listening, I couldn't hear anything they did wrong.

  13. #1528
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    M2 upside down

    I am designing my upcoming theater and have some trouble positioning the subs and LCR in an optimal position at the same time. I saw the picture attached, and was inspired - this would allow me to position speakers and subwoofers how they should.

    But... Do you see any downsides by having the M2s placed upside-down?

    Name:  M2.jpg
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  14. #1529
    Senior Member pos's Avatar
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    I don't think there are any down side (or upside-down side??) per se with this situation, as long as you keep a few things in mind:


    1. Being pretty much textbook, the LR crossover lobe will be centered around a straight line between the woofer and horn, which is precisely the lower lip of the horn (the one under the grill), perpendicular to the baffle. Diverging from that axis will affect summation at the crossover point and result in a dip.
    2. The horn is where the directivity pattern will be the most critical/sensitive, so diverging from its center axis will have an effect as well, especially in the UHF.
    3. The woofer range will be affected by the vertical modes, and it is always a good idea to avoid energizing them too much. 1/4 vertical placement is a very good option (and this is basically what the original M2 design shoot for in a typical listening room ).


    This two first points will mostly affect front seats because a) they are closer and any height difference will result in a greater angle difference b) they have a higher direct/diffuse ratio. There ideal listening position should not be too far off these two axis (think spinorama listening window).

    Point 3 can be achieved with the M2 upside down by shooting for the higher 1/4 point (3/4 from the floor), and could even be refined by using a second (2216nd) woofer at the lower 1/4 dimension for mode cancellation, playing only up to the lower midrange (2.5 way) not to disturb vertical directivity.

    Of course you might have to play with angling to meet all these criteria, but this is not specific to upside-down positioning...

    Also, placing the woofer at a different height will also affect the delay of the floor/ceiling reflections, and consequently change their impact in the frequency domain at a given distance, but this is not something you can design around anyway (short of absorbing or diffusing all that low mid energy at reflection points...!), and it will not be better or worse, just different.

  15. #1530
    Senior Member Don C's Avatar
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    Couldn't he fix #1 by tweaking the delay setting in his crossover?

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