tokyomeltdown has released EQ Mirror, an analysis plugin for macOS that shows the frequency response an EQ is actually applying, measured from the audio passing through it.
One instance is inserted before the EQ and one after it. The two instances pair up on their own on the same track, determine which comes first, measure the delay the EQ introduces and align the two signals before comparing them, so no sidechain routing or setup is required. Most linear-phase EQs are handled without further adjustment.
The difference is drawn as a curve in real time while the EQ’s controls are adjusted, with the largest boost and cut labelled and the spectrum of the music behind it. The measurement is taken from the programme material at the level it is being played rather than from a test signal. Where left and right, or mid and side, are processed differently, the curve widens into a band and indicates which. Changes a curve cannot describe, such as distortion from modelled tubes and transformers, are shown as a single figure.
EQ Mirror is intended for engineers working with analog-style EQs, whose markings indicate control positions rather than the resulting response.
The plugin does not alter the audio: bounces with and without it are bit-identical, and it reports no latency to the host. It does not read or change the EQ’s settings.
Pricing & Availability
EQ Mirror is available now in AU, VST3 and AAX formats for macOS 12 or later, runs natively on Apple silicon and Intel, and is signed and notarized. It supports mono and stereo tracks.
EQ Mirror costs $18 as a one-time purchase covering up to five Macs, with a 14-day trial that has every feature and requires no account.
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