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  • Stereophile

    MEASUREMENTS

    Dec 08, 2020 5 minutes
    —John Atkinson

    tested the Marantz Model 30 with my Audio Precision SYS2722 system (see the January 2008 “As We See It”). I looked first at its behavior via its line inputs, mostly with the volume control set to its maximum of “0.0,” then at lower settings. (The volume control operates in accurate 0.5dB steps.) As the Model 30’s power inlet lacks a ground connection, I connected a wire from the analyzer ground to the ground terminal on the amplifier’s rear panel, to minimize power supply noise, which would otherwise be a problem with the phono input. Because the Model 30 features class-D output stages based on Hypex modules, all the measurements other than the frequency-response tests were taken with Audio Precision’s AUX-0025 passive low-pass filter, which eliminates the ultrasonic noise that might otherwise

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