Kevin, as Randy pointed out, this is literally just a "bit more" of a theoretical maximum which may never be needed. The difference between 115 watts and 140 watts is only about 0.8 dB in maximum loudness. For example, if a brief peak can now be played at 107 dB, it could instead be played at 107.8 dB, an insignificant difference.

Your receiver is already capable of clean amplification at beyond safe listening levels and no price should be "tempting" if the purchase wouldn't bring real benefits.

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Enjoy the music, not the equipment.