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Warwick 4x10 speaker cab - damp ?

Stored all the time, in an on the street van, and obvious mold spotting of the cones. Actual problem is 8//8 + 8//8 wiring with 1 driver failing unnoticed in a gig and then followed by the other strained one, oddly at low level output, in practise session. Well I assume that is the scenario. At least I can bypass the failure pair with some high W droppers for them to practise next week, before replacing properly.

Could dampness have played a part in the failure? Owner obviously handles the cabs with respect , so I have to believe that he does not overdrive them (from the original matching bass amp ) - blurb says

600W cab

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook
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Dampness as in high humidity isn't a likely culprit. Voice coils don't corrode or host molds. Did you inspect the magnet structure for corrosion? There is a remote possibility that the magnetic pole inside and around the voice coil could corrode but I seriously doubt it would cause a failure that couldn't be previously detected as a rub. My guess would be either a defect in the driver or the cab was overdriven and the client isn't being honest. I used to see that all the time when I worked on a lot of amps and cabs.

Reply to
Meat Plow

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Agree but I won't be inspecting the voice coils until after replacing the 2 failed units. Reassembled with a number of W/W droppers in there for the moment. Moving the cones/feeling by hand shows no grittiness or scratchy noises so no burst coils, no burning smells around them. There is a few Mohm across one of them. Other than they have copious grey mold spots on the outer face of the the cardboard, they and skirts etc look fine.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

Sounds like corrosion could have set in. Rip out the cones/coils of the the failed units. They have to be reconed or replaced anyway...and will provide proof-positive of the cause. The rot could have happened at any part of the electrical/mechanical chain. I'd first suspect the flex connection where the wire is soldered to the speaker terminals, running to the cone (that might actually be repairable)--but with that much mold....

jak

Reply to
jakdedert

Bass speakers often fail without having a rub or burnt smell. I blew one Eminence 10" in my 4x10 Fender bass cab in the 18 years I've owned it. I'm sure that it was caused by the demand I imposed upon it with a 1000 watt RMS Crown. No burn or rub just a fracture of the the wire in the voice coil.

Reply to
Meat Plow

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I hope there is a good technical reason (not known to me) why Warwick wires them as

8//8 + 8//8 I would have wired them (8+8) // (8+8) so if one failed then no other failure and it would be possible to continue to end of gig, but as driving 16 ohm, with less power.

If no one realises that only 2 of the 4 are working ,then - what the hell! It would unlikely to be straining the amp

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

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