#1
I was just wondering if a 10 watt head thru a 4x12 cab would be as loud as a 50 watt head thru the same cab, cheers
#3
Quote by King Donkey
The 50 watter would be much louder.


This. I'm sure the cab just provides speakers for the watts for your cab.
#4
it wont be as loud. The more speakers does make stuff a bit louder, but the difference between a 2x12 and 4x12 isn't doubled volume, but it is the 'more' air pushed away from the speakers (and of course, the increased feedback), so a 50w through a 4x12 would be a bit louder than a 50w through 2x12, but more people will hear it as the air pierces through more than the 2x12. But a 10 watt is gonna 'produce' less volume (not MUCH less, but generally less) as the wattage =/= volume, but more wattage = more clean headroom.
Does that make sense?
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#6
Think about your question: "which amp will have more power a 50w or 10w amp?"
The answer should be fairly obvious...
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#7
Speaker sensitivity is important too.

Wattage isn't necessarily a great way to compare amps - a 10W valve amp coould probably overpower a 50W solid state through the same cab.
Manufacturers' ratings can also be misleading sometimes ( the stand is RMS wattage, but some manufacturers use Peak ratings to make their amps sound more powerful. Bugera, I'm looking at you.)