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You never will do this, because there is really no 4 ohm amplifier. The amplifier will have an output impedance of around 0.04 ohms. In hi-fi we have always impedance bridging. Zout << Zin. The damping factor Df = Zin / Zout tells you what Zout is. Zout = Zin/Df. If the damping factor Df = 200 and the loudspeaker impedance is Zin = 4 ohms, the output impedance of the amplifier is Zout = 4 / 200 = 0.02 ohms. You see, there is no "4 ohm amplifier" with a 4 ohm output. Scroll down to related links and look at "Interconnection of two units (Voltage Bridging - Zout < Zin)".

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Q: How do i run a dual 4 ohm at 4 ohm?
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