Gem EQ550

Name: Gem EQ550
Price: 99 USD
Author: Overloud

by Overloud · EQ · American proportional-Q EQ (550 style)

Not rated yet

Gem EQ550 simulates a classic American 5-band EQ with custom op-amps and a proportional-Q design.

It adds band cue, continuous frequency selection and transformer simulation. It costs about $157.83 (€139).

Best for: Drums, Guitars, Vocals. Genres: all genres.

Keywords: transformer, classic, CPU-light, punchy, vocals, electric guitar, mixing, op-amp, drums, hardware emulation, resizable UI, undo/redo, A/B compare, aggressive, American console, kick, smooth, snare, static, tight.

What it does

Gem EQ550 is Overloud's model of a classic American console EQ built around custom op-amps. Its defining trait is proportional Q: the bandwidth narrows as gain increases, so small boosts sound broad and smooth while bigger moves get more focused and aggressive.

Five bands: two bands switchable between shelving and peaking, two peaking bands and one band-pass section.
Extra mid band: the layout adds a mid band beyond the original hardware, which Overloud pitches as the band fans of the unit always wanted.
Continuous frequency selection: frequencies can be set anywhere, not only at the stepped values of the hardware.
Proportional Q: bandwidth tightens as you boost or cut harder, giving the punchy, forward character the 550 style is known for.
Transformer simulation: modelled on the original unit; input and output gain let you push the transformer into more saturation.
Per-band Cue: solo a single band to hear exactly what it is doing.
Workflow: resizable interface, multilevel undo/redo, A/B comparison, scribble strips for notes and a preset library taken from real mixing sessions.
Low CPU: Overloud quotes more than 1,500 instances on a MacBook Pro Retina.

KVR lists version 1.1.6. A trial is available.

Source: Overloud product page

When to use it

Gem EQ550 is the pick when you want an EQ that adds punch and attitude rather than one that stays out of the way. Compared with Pro-Q 4 or TDR Nova it is far less precise, with no analyser, dynamic bands or surgical notch tools, but its proportional-Q curves get musical results fast on drums, guitars and vocals. Unlike the Pultec Passive EQ Collection, which suits broad, gentle shelving, it is an active, mid-forward EQ that cuts through. It is also very light on CPU, so it can sit on every channel of a mix.

Best for: punchy, forward EQ moves on kick, snare, toms, electric guitars and vocals.
Genres: rock, pop, funk, hip-hop and any mix that wants a classic console sound.
Look elsewhere if: you need surgical, linear-phase or dynamic EQ (Pro-Q 4, TDR Nova) or smooth, broad passive curves (Pultec Passive EQ Collection).
Tip: raise the input gain and trim the output to lean on the transformer simulation for extra colour.

What producers say

Reviewers rate it highly for tone and value; the main caveat is that it trades some accuracy for low CPU use.

Sound On Sound (Gem Studio review, 2021) named it the reviewer's favourite of the three Gem EQs, saying it shapes tone in an "authoritative yet natural way".
Sweetwater buyers rate it 5 out of 5 from 1 review, calling it "like a hardware unit for nearly nothing".
Criticisms: Sound On Sound noted that the Gem range sometimes favours CPU efficiency over perfect accuracy, and that 550-style emulations face strong competition.

Where to buy

PluginFox: $99
AudioDeluxe: $99
Overloud: $157.83 (€139 incl. VAT converted to USD (ECB rate, 29 Sep 2026))

Tutorials and reviews

Similar plugins

BAE-1084 by Antelope Audio · Vintage console channel EQ · $19.90
Trident A-Range Classic Console EQ by Universal Audio · Console EQ · $59
API 550 by Waves · Console EQ · $29.99
FG-A by Slate Digital · Vintage American 4-band EQ · $149
Pre 1973 by Arturia · Preamp and EQ emulation · $49
KH-EQ1 by Black Rooster Audio · 5-band semi-parametric EQ with saturation · $59
Gem EQ84 by Overloud · British Class A EQ (84 style) · $99
BAE-1023 by Antelope Audio · Vintage British console EQ · $18.90
NEED 31102 Console EQ by NoiseAsh · Classic console preamp and EQ · $59.90
NEED 84 Console EQ by NoiseAsh · British Class-A preamp and EQ · $59.90

All EQs