Warwick Pro 211 Cabinet Issues

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Basement

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I use a Markbass LMII amp, generally with a Warwick Pro 211, 8 ohm cabinet on its own, but sometimes with a Warwick Pro 115, 8 ohm cabinet linked to run full power at 4 ohms - depending how much air I want to move..........

Recently the amp has started to cut out intermittently, part way through a song. Powering off and back on cures the issue temporarily but 5 minutes or so later the fault repeats.

The amp has 'short circuit protection' and I am wondering if the Pro 211 might be the cause ? Cables have been checked and are fine.

I have read of a few problems with the HF horn in the Pro 211 cabinet failing, it it likely the short circuit could be associated with the tweeter or one of the 10" drivers ? Any help or advice appreciated.
 
I doubt it. I blew all my tweeters once (well...another band did when I supplied back line), and the cabs still operated fine with the head, I just lost the high frequencies.

I've also blown my 115 cab and that still didn't make my head play up. When both cabs were connected (working 410 and blown 115) head and working cab all still operated as normal.

Sounds to me more like a problem with the head. With my (limited ish - I'm no amp tech) experience, cabs are very simple. They either work or they don't.
 
I am with Alex on this one. But the best thing is to have it checked by a specialist...
 
Basement said:
I use a Markbass LMII amp, generally with a Warwick Pro 211, 8 ohm cabinet on its own, but sometimes with a Warwick Pro 115, 8 ohm cabinet linked to run full power at 4 ohms - depending how much air I want to move..........

Recently the amp has started to cut out intermittently, part way through a song. Powering off and back on cures the issue temporarily but 5 minutes or so later the fault repeats.

The amp has 'short circuit protection' and I am wondering if the Pro 211 might be the cause ? Cables have been checked and are fine.

I have read of a few problems with the HF horn in the Pro 211 cabinet failing, it it likely the short circuit could be associated with the tweeter or one of the 10" drivers ? Any help or advice appreciated.
Click to expand...
jacks ?
 
I would get the amp checked, it could be a thermal protector kicking in. This could be due to a heating issue, or an issue with the protection circuits. I have heard of a couple of LMII heads having issues with MOSSFETs. It might be conincidence that a couple heads i saw died, but get them checked, If soething does go wrong with the amp its better to sort it out early rather than waiting for something to blow which can take out other components with it.
TRUST ME on that one....I once left "amp powering up funny" too long untill it turned to "blue smoke of doom and no sound":x. Power up protection was going wrong for a while, went with a bang and took an output stage with it.
 
If you're still not convinced and you live in the US I might take it off you're hands. :D
 
Thanks for your input guys. The jury is still out. I have run the amp with my 115 in rehearsal and small pub gig without any problems. I opened the 211 and disconnected the speakers to look at the DC impedance, the 10" drivers match pretty well. As the tweeter doesn't work I was checking the easiest way to disconnect that circuit and found the negative side was not soldered to the tag on the attenuator pot, the coil wire and negative wire were soldered together but went through the hole in the pot' tag without any solder whatsoever, I guess causing an intermittent connection as the cab vibrates. I remade the joint, the cab works OK but the amp and cab probably need pushing harder than at home to be sure. I hope this is a case of the Markbass protecting itself from an external fault. We'll see........
 
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