Originally Posted by whoaru99
Most amps I've seen have significantly lower output impedance than what load is presented by the speakers.
If memory serves me, having an output impedance on the amp that high (and matched to speakers would be considered very high) will result in very poor damping factor and and will cause the amp's frequency response to change as the speaker goes through it's normal impedance swings.
Yeah what I said before is more suited to an idealized scenario where you have a very well quantified, resistive, input impedance. One way of looking at it is if you have a power amplifier with an output impedance of 0.01 Ohms then the maximum load (minimum impedance, maximum power out) would be if you hooked a 0.01 Ohms load out of the amplifier. If you have a speaker with 4-8 Ohms of input impedance you will not have any advantage of using a power amplifier with 4-8 Ohms of output impedance versus a power amplifier of 0.000001 Ohms of output impedance. Again not accounting for impedance fluctuations, both amplifiers will deliver the same current to the speakers. The difference is that the amplifier with the lower output impedance could handle a larger load (lower resistance speakers) and then deliver more power.
From the perspective of the amplifier if you give it a load equal to its output impedance you will maximize the amount of power that the amplifier is capable of delivering. From the perspective of the speaker if you give it a source with an output impedance LESS than its input impedance you will supply the maximum power it will accept.