What's wrong with my friend's cab?

Discussion in 'Amps and Cabs [BG]' started by superbassman2000, Dec 13, 2005.

  1. Hello cab crew!

    so my friend has a Behringer BB210 (i'm sorry! i tried to talk him out of it!) and he has had it for about two weeks and it doesn't work anymore (no big surprise)
    anyways, i thought maybe someone here might know what the problem is, as there is no sound at all coming out of the speakers. He also bought the Behringer head that goes with it (I know, i really tried to talk him out of that one too!) and the amp still works, and he never turned up the amp really loud so I don't really think he blew the speakers (although i don't know how good behringer speakers are). I tried my AMP 220 with his cab, and there was no sound, but there was a decent sized spark when i unplugged the amp from the cab...
    does anybody know what might be the problem?
    is there a way to test the speakers without taking the cab apart?

  2. Thor

    Thor Moderator Staff Member Gold Supporting Member


    You need an ohmmeter. You can test the continuity by doing the following without disassembly.

    Patch the speaker cable into the cab. Take the ohm meter and set it to Rx1. This will send DC current through the leads.
    Touch 1 lead to the shaft and the other to the point of the
    1/4 connector briefly. If the meter shows something
    between 3 and 8 ohms, there is continuity in the circuit.
    If the meter doesn't move, there is a short.

    If there is a short, (very likely) it will have to be disassembled
    to fix it. Given where you saw the spark it is very likely to
    be the wires to the input jack are loose or poorly connected
    or soldered.
  3. dgovaerts


    Dec 22, 2004
    If it's only 2 weeks old, take it back to the store were he purchased it and leave it there, normally he should get a full refund. I know there is an European law that says so...
  4. Thor

    Thor Moderator Staff Member Gold Supporting Member

    ^ Man's got a point. Also tell your buddy how you
    really feel about the great quality product he just
    bought, maybe he might trade up.
  5. he got it on musiciansfriend i believe
    i will see if i can scare up an ohmmeter, thanks for the tip thor!
  6. Thor

    Thor Moderator Staff Member Gold Supporting Member

    He should still call up and complain.
    Find out where the warranty service center is.
    2 weeks = cheap crapola.

    PS the ohmmeter is a integral part of a DIY kit.
    Tons of uses if you are a wire and plier head.
    I like the one with a dial as opposed to a digital
    readout. YMMV. Try Radio Shack. I also saw some at
    Lowes pretty cheap the other day.
  7. blujax01


    Nov 16, 2005
    If the ohm meter is set for resistance and there is a short, shouldn't the meter peg as there would be infinite resistance? If the meter doesn't move, that would indicate an open circuit, yes?
  8. Thor

    Thor Moderator Staff Member Gold Supporting Member

    Yes. You are correct. Let me rephrase that.

    If the wire fell off the terminal, and the circuit is open,
    the meter doesnt move. The resistance is infinite.

    If the circuit is continuous, and current will flow through
    it, it will show some measurable resistance at that measurement point. 'Short' is a poor choice of terminology on my part.

    But it doesn't change what he needs to do really.

    An ultimately, if and when the cab is disassembled,
    the same procedure is used to check each branch of the circuit till the discontinuous component is isolated and