A Very Simple 13.5 Watt RMS Power Amplifier, into an 8 ohm load.
This was the Maximum output before Clipping on the Oscilloscope, using an 8 Ohm Resistive load.
Supply Current was aproximately 17 mA.

Into a 4 Ohm Resistive Load, the ouput was about 22 watts.
Supply Current was aproximately 65 mA.

I Used a TL081, but Most other Dual Supply op-amps could be used.

Supply Voltages and Output Power is Limited by the Op-amp.

If you have an Op-Amp with a Greater +/- Supply Voltage, You will Increase the output Power.

For Example: I ran the supply voltage up to +/- 20 volts and the Output Power Increased to 18.5 Watts.
Supply Current at full power was now 230 mA.
However, This REALLY Exceeds the Recommended Supply Voltages for this IC and I doubt it would last very long.
And I Didn't push my luck, by trying a "4 ohm load" with this supply voltage.


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 Amplifier Schematic