marshall jcm 900 cab w/ 1972 50w head?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Hoady Snitch, Nov 23, 2004.


  1. Hoady Snitch

    Hoady Snitch Guest

    :NUTS .......hey fellers....I have a dumb question....so please bear
    with me.....
    I am familiar with the older style marshall 1960 cabs....
    and just got a JCM 900 4/12 with the english made celestions
    g-1275(had these speakers before, didn't think they sound as
    bad as some claim so i'm familiar with that debate)
    I bought it cause it was a decent deal......
    O.K. the question; this cab has the mono / stereo switch on the
    back......the speakers are 16 0hm. each
    the mono(left) says; 4 ohm input and stereo(right)says 16 ohm
    input and below that it says 8 ohm(left) and 8 ohm right
    stereo 300 watts mono 150 watts.
    question; what is the best way to run this cabinet with my
    marshall 1972 50 watt head and corresponding impedence selector?
    thank you kindley:dude
     
  2. John Phillips

    John Phillips Member

    Messages:
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    Joined:
    Mar 17, 2002
    Location:
    Scotland
    Set the cab to mono; plug into one of either the 4-ohm or the 16-ohm sockets; set the amp to the corresponding impedance.

    You may notice a tonal difference between the two - 4 ohms should sound deeper and smoother, 16 should be brighter and more 'peaky'. Not a huge difference, but it may make one setting preferable to the other.

    BTW, I used to dislike those 75s too... but since I've been hearing so many Chinese-made ones I'm beginning to think the British ones aren't so bad after all ;).

    Question - do the speakers have vent grilles in the back of the magnets?
     
  3. Hoady Snitch

    Hoady Snitch Guest

    :) vent grilles? don't think so just the magnet with with round sticker at center of back of magnet that says; celestion,
    celestion england G12t-75, professional loudspeaker, covering the small hole on back
    also have on speaker frame; 28ct3760-18
    and #1777 on the cones themselves
    as the chineese write "made in china" on everything they produce,
    I guess I would expect to see that somewhere on them.
    ...not there.
    thank you for your help Mr. Phillipps!
    :)
     
  4. John Phillips

    John Phillips Member

    Messages:
    13,080
    Joined:
    Mar 17, 2002
    Location:
    Scotland
    Not in the case of Celestion. They're very careful not to - or at least they were, I'm not sure if they are now that they have completed the move.

    Unless they actually say 'Made In England' (usually stamped on the edge of the frame), they're Chinese. The label will say 'Celestion International, Ipswich, England', but that's not the same thing.

    There is a lot of confusion about the origin of some Celestions during the changeover period - maybe deliberately by Celestion, I think. Speakers were apparently assembled in England from Chinese parts too. I wouldn't actually be surprised if some of these were labeled as 'Made In England' either, to be honest.

    That's really why I asked. I'm trying to find out whether the removal of the vent from the magnet (it's a round mesh grille, about 1/2" in diameter) indicates Chinese manufacture, or whether the design was changed some time before the move. So far, all the ones I've seen with the vent also have the older-style label (mostly white, with a black ring around the edge) and are definitely UK-made. The later ones with no vent have the new half white, half-black label. But I'm not sure if there might not be no-vent British ones.

    The reason it might matter is because I think the vent has a bearing on tone, not because I'm anti-Chinese! If I could find some definitely British, no-vent speakers it might help to find out whether that is true. The new ones don't sound the same as the old ones, for sure.


    Hopefully this hasn't confused you too much! The bottom line is, if you like the sound of the cab, it doesn't matter where the speakers were made.

    :)
     
  5. Hoady Snitch

    Hoady Snitch Guest

    thanks again sir!...........:)
     

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