Quote:
Originally Posted by maestrovert
let's say you have a 50 watt amp turned up a bit and you're getting a measured 90db....
if you then add an identical amp, at the same settings and pushing the same 90db, the resulting
volume increase would not equal 180db....
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First of all, because of the logarithmic nature of the decibel scale, a doubling of loudness is equivalent to a 10dB increase, for example from 90 to 100dB, not 180.
Secondly, a doubling in power output represents a 3dB increase. So by running 2 DRs you'd be putting a notional 44W into 2 12" speakers, which might sound a little louder, but not by a lot, and probably a bit fuller.
On the other hand, other things being equal, if you're splitting the output from your guitar between two amps, each one is only going to be getting a reduced signal, so each pre-amp will have less input to amplify.
Experience tells me that, especially if you put one amp on the floor and stand the other on top of it, the sound will almost certainly be fuller with more low-end, but not necessarily any louder. BUT if you then attenuate the bass to compensate you should be able to advance the volume controls further before running out of clean headroom, or for the same amount of breakup.