This question is directed at those who play the bigger venues. Some equipment, especially valve kit, is microphonic so is it necessary to isolate this kit from the stage/speaker cabs? I have always thought that siting an amplifier on top of a 4 * 12 cab is probably the worst place to put it due to the possibility of vibration from the cab shaking up the delicate electronics and valves in the amp. In the world of hi-fi with much lower SPLs, the gains to be had from the use of either isolation devices or spikes which couple the equipment to the stand is far from subtle. I wonder if this is a factor in the bigger arenas.
But then Jimi and Robbo/Gorham plonked their amps on top of the cabs and the sounds were 'not too bad'.......
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I suppose though I don't think of valve amps as being very delicate. Any gains you might have from isolating them from a bit of cab vibration is going to be eclipsed the first time an idiot roadie throws your flightcased amp off the stage.:D, or indeed you drive over a pot hole on the way back from the venue. Maybe if it was an axe or kemper sitting atop a rattling 4x12 at high volume I'd give it a second thought.
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Not had any problems yet, but then it's onlt three decades so the jury is still out.
I guess we've all had combos with rattly valves, they're irritating at home but onstage they don't matter that much within reason.
Spot on.