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A Comparison of Digital Power Amplifiers with Conventional Linear Technology: Performance, Function and Application

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Drawing conclusions about the actual subjective performance of an amplifier from the results of standard tests can be difficult. The measured results for the harmonic distortion and inter-modulation distortion in the case of the linear amplifier are excellent and exceed those of the digital amplifier. However, a subjective assessment with music material ranked the digital amplifier performance as superior. More investigation was required.

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AES - Audio Engineering Society