Parametric EQ explained: frequency, gain, and Q in LA Studio’s five-band rack

A parametric equalizer changes where an adjustment happens, how much it changes the signal, and how wide that adjustment is. These controls are frequency, gain, and Q. Their exact roles depend on the filter type. This guide uses the built-in Parametric EQ card in LA Studio's DEVICES rack to connect those concepts to actual controls.

Open the Device Rack Parametric EQ

1. Open the DAW with a playable recording or MIDI part with an instrument assigned. Use a short, recognizable phrase.
2. Select its track and open DEVICES. Read the target name and check that you have not accidentally selected MASTER.
3. Press the rack's + button and add Parametric EQ. Its card contains a response curve and draggable points.
4. Listen to the original and name the problem before changing controls or comparing bypass.

Channel EQ in the same menu is a separate device with Low, Lo-Mid, Hi-Mid, and High gain controls. The plugin system also has a dedicated Parametric EQ 2 editor. This article concerns the five-band Parametric EQ inside the rack card. Do not substitute another editor's band count or gestures just because its name is similar.

Frequency chooses the part of the spectrum

Frequency is displayed in Hz, with lower frequencies on the left and higher frequencies on the right. A peaking band's frequency moves the center of an adjustment. A high-pass frequency moves the boundary below which low frequencies are reduced. A shelf moves the boundary of a broad low or high adjustment. Identical frequency values can produce different curves with different filter types.

The rack's frequency controls span 20–20,000 Hz. The graph uses logarithmic spacing, so equal horizontal distances are not equal Hz differences. Read the selected band's value as well as its position. These are implemented setting ranges, not measured promises about what every device or listener can reproduce.

Gain sets the amount of change

Gain is the increase or reduction in dB. Move a peaking or shelf point upward to boost and downward to cut, within −18 to +18 dB. Zero gain means no boost or cut from that peak or shelf. It does not make the whole device neutral: the high-pass filter remains active in the initial configuration.

EQ gain and track volume serve different purposes. If a whole voice is quiet, check its track level first. Use EQ when a particular component needs adjustment. Large boosts reduce output headroom, so listen for distortion in the combined mix. Increased loudness by itself is not evidence that the adjustment helped.

Q controls the width of a peaking band

For peaking bands, higher Q narrows the affected region and lower Q broadens it. Decide whether you are addressing a localized resonance or a broader tonal tendency. Hold Shift and drag a point vertically to change Q in the card, over a UI range of 0.1–10. Read the selected band's Q below the graph.

High-pass Q affects resonance near the cutoff. High-pass Gain is unused, and its graph point cannot move vertically. Shelf Q values may appear in the readout, but the Web Audio shelf filters used here do not use Q. These distinctions follow the Web Audio filter specification. A changing shelf Q display does not establish an audible bandwidth change.

Read the five fixed bands and their defaults

Filter types are fixed; there is no type selector on this card. These are implementation defaults, not prescriptions for a singer or instrument. LS/P1/P2/HS are parameter-name prefixes, while LOW/MID1/MID2/HIGH are the selected-band labels.

Display and parameters	Fixed type	Defaults
HP: HP Freq / HP Q	High-pass	30 Hz, Q 0.707; HP Gain is unused by audio processing
LOW: LS Freq / LS Gain / LS Q	Low shelf	120 Hz, 0 dB, displayed Q 0.707
MID1: P1 Freq / P1 Gain / P1 Q	Peaking	1,000 Hz, 0 dB, Q 1
MID2: P2 Freq / P2 Gain / P2 Q	Peaking	4,000 Hz, 0 dB, Q 1
HIGH: HS Freq / HS Gain / HS Q	High shelf	8,000 Hz, 0 dB, displayed Q 0.707

All bands share the frequency range. Applicable gains span −18 to +18 dB, and displayed Q controls span 0.1–10. Distinguish a stored value from an effective sound control for shelf Q and HP Gain. If you need another filter shape, do not spend time looking for a type-switch button that this card does not provide.

Move a point, reset it, and hear the difference

1. Select MID1 and confirm that name in the readout.
2. During playback, move the point horizontally and watch frequency and the curve. With gain still at zero, changing a peaking band's frequency alone produces no boost or cut to hear.
3. Move it slightly vertically to introduce gain and replay the phrase. Moving diagonally changes multiple elements, so learn them separately.
4. Hold Shift while dragging vertically to change Q. Compare a broad adjustment with a narrow one.
5. Double-click the point to restore that band's frequency, gain, and Q defaults. This is neither a whole-device reset nor bypass.

The background spectrum helps you inspect the sound at that moment. It is not a target that every peak should be flattened toward. Removing useful bass or vocal character can weaken the sound even when the picture looks tidy. Distinguish the editable response curve from the spectrum of the playing material.

Address one audible problem

For low rumble, gradually raise HP frequency and check whether the voice or instrument loses body. Move back if it does. For a muddy impression, use a peaking band to locate the relevant range and reduce only what helps. There is no frequency that must be removed from every recording.

For a broad high-frequency adjustment, move the HIGH shelf gently and check consonants and percussion attacks. A boost can also expose noise. If the problem happens only at certain moments, a static EQ still affects the rest of the passage. Return to the previous setting if a correction creates another problem.

Diagnose no change or too much change

If nothing changes, check the audible track, DEVICES target, enabled state, and selected band. Zero peaking gain, shelf Q, and high-pass Gain each explain particular cases of inaudible changes. A source without energy in the affected range also gives little to judge, even when the point moves substantially.

If everything changes unexpectedly, check whether the device is on MASTER. If level jumps, inspect boosts across several bands. Note settings before resetting so you can identify the responsible change. Check the original recording as well: EQ cannot reconstruct missing or clipped source audio.

Judge the result in the mix and exported audio

Toggle the card's enabled control and compare the same phrase at similar playback levels. A striking solo tone may not suit the accompaniment. Finally play all tracks and listen to the relationship between words, bass, and percussion.

The companion mixing workflow guide covers faders, EQ, compression, ambience, and bouncing the final mix. Use it to decide when to apply these controls. Play the exported WAV too and verify that it preserves your intended result before calling the adjustment finished.