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Given the amplifier's reduced linearity in the top audio octave, I examined the spectrum with an equal mix of 19kHz and 20kHz tones at 50Wpc peak into 8 ohms. Fig.9 shows that while the 1kHz difference product lay at –120dB, the levels of the higher-order intermodulation products at 18kHz and 21kHz were much higher, at –70dB (0.03%). As with the possible exception of EDM, recorded music doesn't have high energy above 10kHz, the Buckeye's reduced linearity in this region will probably not have audible consequences.
That aside, the Buckeye Purifi 1ET9040BA offers superb measured performance, with high power combined with vanishingly low levels of noise and distortion.—John Atkinson
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