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This was the best i could make up, fitting a high class requirements. You'd need a split rail ±9V power supply and the output power is 3Wrms. The overall consumption is 6W and the efficiency is 50%, but it works in class AB, which grants better quality audio at lower levels. The peak current draw is 1.5A. THD+N is usually very low at 0.01%. Despite the apparent high grade parameters i recommend using an op amp amplifier for the purpose, for several reasons, some of which are - stability, compactness, ease of construction. The THD reading will probably not be as low as mine, but it'll still be well below the audible limit. Ripple rejection is good at -66dB. The frequency response is 1Hz - above 20Khz. All transistors, except the 2xPower transistors, should be low noise like BC550 and BC549. The power transistors may be any medium power transistor, rated at least 10W. Small heatsinks must be placed.
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