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Phono Filter

About Phono Filter

The phono filter emulates the effect of a phono preamplifier (de-emphasis filter) or the opposite process applied when creating a master record (emphasis filter). It can also apply PCM type emphasis and de-emphasis as found on DAT and early CD recordings. The analog amplitude frequency response is calculated accurately using analytic calculations and applied using a minimum phase filter to match the analog counterpart as closely as possible.

User Interface

Phono Filter UI

Parameter Settings

  • Filter mode

    • Choose deemphasis mode if you have a recorded an LP record without a phono preamplifier. Choose Emphasise if you want to prepare an audio file for an LP master.

  • Output level (dB)

    • Use the output level slider to compensate for the increase or decrease in audio level.

Time Constant Settings

You can adjust the time constants as specified in analog emphasis and de-emphasis circuitry. These constants (T1, T2 and T3) are often specified in literature about restoration of vintage recordings (before the RIAA standard). You can enter these time constants yourself under Time constants.