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“This chart shows the frequency response and channel separation measurements of the RPM 5 Carbon/Sumiko Amethyst combination. While the response remains flat for most of the bass and midrange frequencies, this cartridge runs about 2 dB hot at 20 Hz before flattening out by 50 Hz. The response remains linear until 3 kHz where we begin to progress to a 2 dB dip centered at 5 kHz. At this point, the Left and Right channels diverge whereby the Left trace gets to a 2 DB peak from 12 kHz – 16 kHz before arriving at a 1 dB dip at 20 kHz while the Right trace gets to its 2 dB peak at 16 kHz before meeting up with the Left channel again at 20 kHz. The channel separation components seem to stay pretty close to each other through most of the range.”

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