Originally Posted By: Guitarhacker


...Output impedance match or mismatch will also affect the quality you get. If both are not the same, there will be a noticeable difference...


Although is some electronic circuits the maximum power transfer occurs when Zout = Zload, a typical Power Amplifier has a very low output impedance (<0.1 Ohms). If the amplifier had a Zout of say 8 ohms, driving an 8 ohm speaker, just as much power would appear across the amplifier as would be across the speaker. The objective is to make the speakers Zout as low as possible. This also helps the damping factor.

Amplifiers have different speaker impedance ratings (i.e. 2, 4, 8), but this has to do with amplifier's ouput stage current handling capability and not it's output impedance.

Hope this is helpful.

Wally G

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