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Waves release RS56 Universal Tone Control

Abbey Road 'Curve Bender' EQ recreation launched

Press Release: A passive equalizer with powerful sound-shaping capabilities, the RS56 Universal Tone Control was originally introduced in the early 1950s and used in Abbey Road Studios to prepare recordings for the record-lathe, as part of the process we now know as “mastering.” Later, Abbey Road’s pop engineers began using the RS56 for studio recordings because of its abilities to dramatically manipulate sound – unlike the basic treble and bass EQs found on the mixing consoles of the time. This earned it the nickname “The Curve Bender.”

Waves and Abbey Road Studios have faithfully recreated the unique magic of the RS56, using advanced circuit modeling techniques based on the original schematics. Like its hardware predecessor, the Waves: Abbey Road RS56 passive EQ plugin features three bands with four selectable center frequencies for each and six different filter types, plus independent or linked control over the left and right channels. The result is an extraordinary equalizer that is as effective today as it was when it was created over half a century ago.

Waves RS56 EQ plug-inWaves RS56 EQ plug-inFeatures

  • Based on the legendary RS56 Universal Tone Control passive EQ
  • Three bands with four selectable center frequencies for each
  • Six different filter types
  • Independent or linkable left/right controls
  • Developed in association with Abbey Road Studios


Bass Decibels sets the amount of low frequency boost or cut.
Bass Width sets the shape of the filter.
Bass Frequency sets the low frequency cutoff point.
Bass On/Off deactivates low frequency processing.
Treble Decibels sets the amount of midrange frequency boost or cut.
Treble Width sets the shape of the filter.
Treble Frequency sets the midrange frequency cutoff point.
Treble On/Off deactivates midrange frequency processing.
Top Decibels sets the amount of high frequency boost or cut.
Top Width sets the shape of the filter.
Top Frequency sets the high frequency cutoff point.
Top On/Off deactivates high frequency processing.

Output Level

In Stereo and Duo modes: Controls the left and right channel levels.
In MS mode: The left knob controls the Mid channel; the right knob controls the Sides channel level.

Phase inverts the phase of the signal.

EQ Mode selects stereo processing mode (stereo component only). Stereo relatively links the channels and applies the same processing to both.
Duo unlinks the channels and offers the option of applying different processing to each.
MS applies an MS encoding matrix on the input to the plugin.

VU Meters display output VU readings.

VU Level Calibration sets the dBFS level which appears as 0 VU.

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