P422 Fairuz

The op-amp that put punch and harmonic density on decades of hit records. The boost-and-cut behavior that engineers discovered by accident and have been exploiting ever since. Fairuz takes both and pushes them into territory the original hardware never offered.

Every band runs through a real op-amp stage — voiced after the discrete circuits that defined what an EQ could do to a sound, not just to a frequency. Push it and it gives back warmth, density, harmonic weight. Back off and the signal stays cleaner, more transparent. That character is always there, whether you're sculpting frequencies or not.

Turn a band off and the op-amp stays in circuit. Without drawing any EQ curve at all, you get the harmonic color that hardware EQs only deliver when you boost hard. This is Band Saturation Mode: op-amp character at a specific frequency, completely independent of your EQ moves.

The Contour bands take the classic boost-and-cut trick — the one engineers replicated for years using two separate filters on the same frequency — and make it a single band. One move. Focused boost, automatic complementary dip, no congestion in the surrounding frequencies.

Push Fairuz hard: bold Contour boosts, full Hammer drive, op-amp saturation across every band. Then blend it back with MIX to taste. All the character, as much or as little as you want.

Features

• Four op-amp EQ bands with three filter shapes: Bell, Contour, and Contour X2.
• Band Saturation Mode: decouple the op-amp from the EQ curve for frequency-targeted harmonic character.
• Proportional Q: gentle boosts stay wide, large boosts focus automatically.
• Stepped or continuous frequency: stepped points chosen by ear, with deliberate gaps that avoid problem zones.
• TREMOR infrasonic circuit: sub-bass foundation before the EQ.
• VOICE input transformer: harmonic drive that sets the tonal stage.
• Hammer output transformer: body, density, and saturation at the output.
• LO and HI sculpting shelves with complementary dip behavior.
• HPF and LPF with switchable HPF position (pre or post transformer).
• MIX: parallel wet/dry blend without extra DAW routing.
• Dual Mono: true stereo hardware behavior for buses and groups.
• Oversampling for the cleanest harmonic behavior at standard sample rates.
• Zero latency.