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Cabinet abruptly stopped making sound

Discussion in 'Amps [BG]' started by prater, Jan 27, 2014.

  1. prater

    prater Supporting Member

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    I loaned a friend my home built 2x10 cabinet recently. He was using it as a standalone speaker cab with his GK 700 RB IV.

    He called me today to tell me it stopped working, he said it was working fine, he stopped playing for a minute and when he started playing again there was no sound.

    It is a sealed 2x10 cabinet with 4ohm speakers in it wired in series with a simple input I salvaged off an old Behringer cabinet.

    Nothing fancy, no horn no other wiring.

    So anyway I'm thinking one of the speakers must have blown, in my experience blown speakers still make some sound.

    However if one speaker for whatever reason had a bad connection then the other wouldn't work either.

    Also he said he checked the head with another cab and it works fine.

    What do you think?
  2. SnowCal

    SnowCal

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    Yeah. The circuit being broken would kill it completely like that. Blown speakers have always made awful sounds for me.
  3. B-string

    B-string Supporting Member

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    Blown speakers can and often do open the voice coil windings (open circuit). Any chance you used slip-on connectors for the speaker terminals (now have a loose wire) or a solder joint could have failed on the jack?
  4. prater

    prater Supporting Member

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    I did use slip on connectors. I've never had one come off like that before but I suppose it is possible.

    He is bringing the cab back to me tomorrow, so I'll pull the speakers and test them with a 9V battery.

    I have a spare speaker of the same make and model so I can drop in a replacement if need be.

    I wonder if the particular use could have caused the damage. I use to the 2x10 cabinet with a 1x18 and a 280 watt head at 4 ohms. Never have a problem with volume since it has the extra cab.

    He was running the cab alone at 4ohms and 480 watts in a band setting. I think he was likely a little pressed for volume having only 2 speakers and pushed it too hard.

    I'm confident I can get it working again but I'm seriously considering not letting him use it again. I know he wouldn't have done anything intentionally but he doesn't know much about speakers/cabs, ohm loading etc.
  5. B-string

    B-string Supporting Member

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    Chances are good he poured too much power into the cab trying to keep up with just a single 210 ;).
  6. basscooker

    basscooker

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    Disclosures:
    Owner, Chopshopamps.com
    My thoughts were a loose spade connector came off, too.

    Did you mis-type the second part there? I thought in the OP you said you had two 4Ω speakers wired in series. He couldn't have had it running at 4Ω if that's the case.

    IDK what the 700RB is rated to put out at 8Ω, but what are the speakers rated for? If he fried one (or both) I think you both just learned a valuable lesson. He needs to kill his own gear, and you shouldn't loan yours out to folks who you know don't have the knowledge to keep it safe;)

    I'm still thinking it's a connection, though.
    Hey, B-string, if there is something fried inside the driver, would the problem wait for the program to stop before manifesting itself? I.E. if the coil was right at melting temp (or whatever), would stopping playing, allowing it to cool, actually make something go wrong (like hot glue doesn't hold until it cools)?
  7. B-string

    B-string Supporting Member

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    Well it is possible, think of an incandescent bulb that works well until you turn it on again. If it was heavily heated when the song ended, no air pumping through to help cool the voice coil.
  8. Downunderwonder

    Downunderwonder

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    Unless you find lost connection, it's fatal.

    Definitely risky business using only 2x10 in a loud band.
  9. Cirk

    Cirk

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    If anything was damaged (blown speaker, etc), your friend should at least cover the repair cost. This stuff is precisely why I don't like to lend out gear.

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