It all started during rehearsal last week. Sound just quit after 2 sets. Found the speaker wire was shot. Switched it with my own good cabe and she worked for the rest of the rehearsal with no problems.
A week later, rehearsal time again and I hook everything up. tubes are all lit - glowing warmly and I have full power but no sound. I try my own speaker cable again - no sound. I fiddled with the vol knob and got a split second of sound - then nothing. Try another speaker cabinet - nothing. Hook up another head - and we're good to go. There is no crackling or poping when I fiddle with wires or knobs.
I'm going to check the fuses, but how can power be getting to the amp as a whole if the fuses are gone? A poor speaker wire would make sense as the start of my problem. I hope it's just a fuse.
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First of all i need some more information, such the power amp you've hooked to them rating in watts and please specify if you are not getting sound from tweeter or 15" BW speaker or both of them, this way i can improve accuracy helping you out.
Recommend an Ashdown or Fender with a 15" speaker, they will give a good sound, are gig-worthy, and will last. I use a Behringher 120W for rehearsal work, it only has a 12" speaker and thus cannot give a good 'presence', also I have been reliably informed, a lot of custom chips are used in thier amps. Don't forget, a bass 'E' goes down to something like 60Hz, and a good speaker and amp are a must for bass work
To troubleshoot the problem start with the bit that is working - the left speaker.
Unplug the input leads on the back of the left speaker and swap them round.
If sound now comes out of right speaker and not the left the problem is with your sound source (computer, IPOD or whatever) or the connecting cable is faulty.
If there is still no sound from the right speaker try turning the volume control knob up and down quickly several times - does this produce any sound from the right speaker? Sometimes the electrical contacts get dirty and this can help clean them.
Turn the speakers off using the volume control knob. Disconnect the speaker wire for the right speaker from the OUTPUT on the left speaker (push the red and black tabs downwards and gently pull the wires out. Find a small 1.5 volt battery (an AA or AAA size will do nicely) and touch the bare ends of the speaker wire briefly on the battery terminals. If you hear a slight crackling sound the wire and the speaker are okay and the problem is in the amplifier, which will need repair or replacement - not a job for an amateur.
If you don't get any sound from the battery test find another piece of speaker wire (any piece of 2 core cable with bare ends will do for testing) and repeat the battery test. If you get sound then replace the speaker wire. If not remove the speaker wire again and go to next step.
Lay the speaker face downwards and carefully unscrew the back panel (don't do this if it is still under manufacturers warranty - take it back for repair or replacement). Lift the back panel off carefully and slowly taking care not to pull the connecting wires inside the cabinet, which will probably be quite short. You may have to settle for just rotating the back panel slightly so that you can see inside if the wires are too short to do otherwise.
Use sticky tape to tightly attach the bare ends of the speaker wires to the terminals of the battery. Touch the loose ends of the speaker wires on the two metal terminals where the internal wires are joined onto the back of the big loudspeaker cone. If this produces a crackling sound it is the internal wiring in the cabinet that needs re-soldering. Otherwise the loudspeaker unit has failed and will need replacement.