Essentials

STUDIO EQ

Eight-Band EQ with Mid/Side and Linear Phase

Download free Part of NULL JSFX 2.7: 126 plugins, free and open source (MIT). Easiest with NULL JSFX Hub.

Controls

  • Band 1 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 1 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 1 Freq10 to 30000 Hz — Band 1 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 1 Gain−30 to +30 dB — Band 1 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 1 Q0.1 to 18 — Band 1 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 1 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 1 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 1 ChannelsStereo / Mid / Side / Left / Right — What band 1 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Band 2 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 2 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 2 Freq10 to 30000 Hz — Band 2 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 2 Gain−30 to +30 dB — Band 2 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 2 Q0.1 to 18 — Band 2 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 2 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 2 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 2 ChannelsStereo / Mid / Side / Left / Right — What band 2 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Band 3 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 3 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 3 Freq10 to 30000 Hz — Band 3 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 3 Gain−30 to +30 dB — Band 3 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 3 Q0.1 to 18 — Band 3 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 3 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 3 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 3 ChannelsStereo / Mid / Side / Left / Right — What band 3 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Band 4 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 4 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 4 Freq10 to 30000 Hz — Band 4 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 4 Gain−30 to +30 dB — Band 4 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 4 Q0.1 to 18 — Band 4 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 4 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 4 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 4 ChannelsStereo / Mid / Side / Left / Right — What band 4 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Band 5 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 5 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 5 Freq10 to 30000 Hz — Band 5 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 5 Gain−30 to +30 dB — Band 5 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 5 Q0.1 to 18 — Band 5 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 5 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 5 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 5 ChannelsStereo / Mid / Side / Left / Right — What band 5 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Band 6 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 6 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 6 Freq10 to 30000 Hz — Band 6 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 6 Gain−30 to +30 dB — Band 6 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 6 Q0.1 to 18 — Band 6 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 6 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 6 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 6 ChannelsStereo / Mid / Side / Left / Right — What band 6 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Band 7 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 7 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 7 Freq10 to 30000 Hz — Band 7 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 7 Gain−30 to +30 dB — Band 7 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 7 Q0.1 to 18 — Band 7 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 7 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 7 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 7 ChannelsStereo / Mid / Side / Left / Right — What band 7 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Band 8 TypeOff / Bell / Low Shelf / High Shelf / Low Cut / High Cut / Notch / Band Pass — Band 8 shape: Off, Bell, Low Shelf, High Shelf, Low Cut, High Cut, Notch or Band Pass.
  • Band 8 Freq10 to 30000 Hz — Band 8 frequency (10 Hz to 30 kHz, log scale); drag the band's node across the display.
  • Band 8 Gain−30 to +30 dB — Band 8 gain (-30 to +30 dB) for a bell or shelf; drag the node up or down.
  • Band 8 Q0.1 to 18 — Band 8 Q (0.1 to 18): the width of a bell, notch or band pass, the steepness of a shelf; on a cut, the resonance at the corner (0.71 = flat Butterworth).
  • Band 8 Slope6 dB/oct / 12 dB/oct / 18 dB/oct / 24 dB/oct / 36 dB/oct / 48 dB/oct / 72 dB/oct / 96 dB/oct — Band 8 slope for Low Cut and High Cut: 6, 12, 18, 24, 36, 48, 72 or 96 dB per octave.
  • Band 8 ChannelsStereo / Mid / Side / Left / Right — What band 8 works on: both channels (Stereo), the Mid, the Side, only the Left or only the Right.
  • Output−24 to +24 dB — Level after the EQ (-24 to +24 dB).
  • Auto GainOff / On — Auto Gain: offsets the average level change of the bell and shelf bands, so a brighter or fuller setting is not judged as better just for being louder.
  • PhaseZero Latency / Linear Phase — Zero Latency runs the bands as minimum-phase filters; Linear Phase gives the same magnitude with no phase shift (5120 samples of latency, reported for delay compensation).

Best uses

  • Everyday corrective and tonal EQ on any track, with up to eight bands
  • Steep low and high cuts (up to 96 dB/oct) to clean up rumble and hiss
  • Mid/side EQ on the mix bus: mono the lows, open up the side highs
  • Linear-phase mastering EQ that keeps transients and stereo image intact
  • Fix a single side of a stereo recording with Left or Right bands

Properties

Eight bands in series, each a bell, shelf (RBJ), notch, band pass, or a low or high cut built as a Butterworth cascade of 1 to 16 poles (6 to 96 dB/oct; Q 0.71 is flat, higher Q lifts the corner). Each band runs on stereo, mid, side, left or right. Zero Latency: biquad cascades, no latency. Linear Phase: the same magnitude response as a 2x2 matrix per frequency bin (so mid/side and left/right bands combine exactly), turned into four 8192-tap FIRs (Hann window) and run by 16384-point FFT convolution in 1024-sample blocks; latency 5120 samples, reported for delay compensation. Auto Gain: minus the mean level change of the bell and shelf bands over 64 log-spaced points from 20 Hz to 20 kHz (mid and stereo bands count fully, left and right half, side not), within ±24 dB. The GFX and VST3/CLAP interfaces draw the response over a live spectrum (post, pre or off); drag a node to set its frequency and gain.

Formats

  • JSFXJSFX for REAPER, with REAPER's own sliders
  • GFXJSFX GFX for REAPER, with its own interface
  • VST3VST3 for any DAW
  • CLAPCLAP for any DAW

Factory presets

Vocal Clean Up · Kick Weight And Click · Snare Body · Acoustic Guitar · Bass Definition · Mix Bus Polish · Mastering Linear · Mono Low End · Wide Air · Telephone Voice · Surgical Notch 60 Hz

Try it

Try it on orOS StudioAdd it to a track in your browser, with its own interface. Nothing to install.

Goes well with

Channel UtilityGain, Phase & RoutingDe-ClipRebuild Clipped PeaksAuto PanLFO Stereo PannerAuto-LevelerAutomatic Gain RiderBand SplitterMultiband Crossover RouterClick RepairClick & Pop Removal

All 126 NULL JSFX plugins