#2
It should give you a general guide. However, you should be wary as some companies, most notably Behringer, overmark the wattage of their amps.

Also, tube amps usually tend to sound louder than their solid state brothers. I've heard that tube can be compared to SS as three time louder.

Imo, best thing to go maybe the decible rating given with some amps.

Hope that helps.
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