Well, you did ask....

:-0

Actually 'impedance matching' is not desirable in this application. The amplifier is intended to act as a perfect voltage source, so ANY resistance in the source (or wire) will combine with any bumps in the speaker impedance curves to produce complementary bumps in voltage delivered to the load (speaker).

In real life the internal resistance of well designed amps and reasonable wire, combined with reasonable speakers present no such problems.

I would guess that the switch might adjust the amplifier rails to an alternate voltage or something, but that's pure speculation.


Charlie