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Originally Posted by Mayhem
You could also use "polyswitches" which do a similar job.... The bonus here is that unlike the globe that needs to be replaced, backing off the power will cool down the polyswitch, allowing the gig to continue.
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The problem with polyswitches is excessive hysteresis - once they trigger, you have to cut the power down to almost nothing to get them to reset. The lamp, as long as it doesn't blow, acts more as a compressor/limiter, with the resistance dropping rapidly as the power falls below dangerous levels.
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Also, Mosfet power amps are prone to oscillation at higher frequencies whcih also will take out speakers. This is a lot harder to detect as it is past the audiable range. I do not know all that much about it but I am lead to belive that the polyswitches can offer protection from this as well.
John - are you able to add to this?
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Not really, most of my experience has been with bipolar power stages.
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Another point regarding clipping - this actually means that you are sending DC or direct current to the speakers which is bad. The reason that I mention this is that you may hear someone suggest "checking if an amp has DC at the outputs". This is what they are checking for.
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Actually, not true. DC at the outputs is generally the result of the failure of one or more transistors in the amplifiers. Also, being that it's a two-channel amplifier driving a pair of speakers with passive crossovers, DC is effectively blocked from the tweeters by capacitors in the crossover. Such a fault is much more likely to smoke the woofers.
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Originally Posted by TimoteusR
He thought the monitor wedge was possesed by demons...
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ROFLMAO!
John