Constellation Audio Perseus Phono Preamplifier - Manual (Page 14)

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22. High-frequency EQ knob
This knob adjusts the response of the passive RIAA EQ circuitry at 10 kHz in ±2 dB steps. It can be used
to fine-tune the sound to suit your system, your turntable, your cartridge or your taste. We recommend
you start with the knob in the C position, and adjust if necessary.
23. Low-frequency EQ knob
This knob adjusts the response of the passive RIAA EQ circuitry at 50 Hz in ±2 dB steps. It can be used
to fine-tune the sound to suit your system, your turntable, your cartridge or your taste. We recommend
you start with the knob in the C position, and adjust if necessary.