Watt= volts x amps If you increase the amperage then you must reduce the voltage. If a amp is driving a low impedance load, then amperage would be a factor you would want to look at. Most solid state amps double down into lower impedances. This would tend to increase the amperage because the power supply will only provide so much voltage---simply speaking. It's actually a little more complicated than that.
Bigjoe, That's correct but a double of the volume is not going to be worth much because the louder the average volume the more likely you are to clip peaks. To me, this would be the value of a powerful amp. Not so much volume but to have the sound cleanly reproduced. Suppose you're using a average level of 10 watts and a 20 db peak rolls through? This is why I say the true volume difference want be "That" big.
As to the last statement by Coffee nudge, watts are watts and power is represented by watts. I never have figured where the myths come from. Solid state amps(well designed) will usually double down into lower impedances. Tube amps have a tendency that what you get at 16 ohms is pretty much what you get at 4 ohms. Tube amps are not stable sometimes and lengths must be taken to allow operation into different impedances---hence, multiple taps.
Bigjoe, That's correct but a double of the volume is not going to be worth much because the louder the average volume the more likely you are to clip peaks. To me, this would be the value of a powerful amp. Not so much volume but to have the sound cleanly reproduced. Suppose you're using a average level of 10 watts and a 20 db peak rolls through? This is why I say the true volume difference want be "That" big.
As to the last statement by Coffee nudge, watts are watts and power is represented by watts. I never have figured where the myths come from. Solid state amps(well designed) will usually double down into lower impedances. Tube amps have a tendency that what you get at 16 ohms is pretty much what you get at 4 ohms. Tube amps are not stable sometimes and lengths must be taken to allow operation into different impedances---hence, multiple taps.