API 550A 500 Series 3-Band Equalizer

Reissued by popular demand, the API 550A is a 500 Series 3-band equalizer that delivers legendary API tone in a compact format. With its classic discrete design, flexible controls, and versatile filter options, this legendary equalizer is an indispensible studio tool. Its timeless design, musical tone-shaping, and thoughtful features make it easy to shape the tone of any track in the studio or on stage.

LEGENDARY API SOUND

The API 550A embodies the renowned tonal signature that has defined countless hit recordings since the late 1960s. Its discrete circuitry and musical frequency settings capture the warmth, clarity, and punch that API Audio is known for. Designed to reproduce the magic of classic recordings, this workhorse EQ enriches every element of your mix. This iconic unit is the perfect way to add some vintage API magic to your studio.

REVIVING A CLASSIC EQUALIZER

After decades of customer demand, the API 550A discrete EQ was reissued in 2004. This revival stays true to its heritage, with every circuit meticulously recreated to deliver the sound that made it a studio staple. More than a reissue, this is a celebration of classic studio design. The popularity of the legendary 550A proves that true audio excellence never goes out of style.

3 BANDS OF SIGNATURE API EQUALIZATION

The API 550A features three versatile EQ bands, each with seven selectable frequencies carefully chosen for maximum musicality. This simple but thoughtful design offers unparalleled flexibility for precise tone-shaping. Each band provides +/- 12 dB adjustments, and the detented concentric knobs make recalling settings easy. From subtle tonal shifts to dramatic boosts and cuts, these three bands provide endless tonal options.

PRISTINE SIGNAL INTEGRITY

Engineered for high headroom and low noise performance, the API 550A preserves the full dynamic range of your source without compromising clarity. Every circuit is meticulously calibrated to minimize unwanted noise and coloration—even when pushing for maximum gain. This uncompromised signal integrity empowers you to make bold, precise adjustments, confident that the true character of your audio will shine through every mix.

THE API LEGACY

The API Audio name is synonymous with bold sound, innovative design, and reliability. The legacy of API began in the late 1960s when their unique products set new standards of sound quality in studios worldwide, and the brand has been revered by top engineers for decades. A direct descendant of that pioneering spirit, the 550A discrete EQ reflects both the heritage of API and its continued commitment to excellence in sound.

API 550A FEATURES:

• 3-band discrete classic equalizer
• 7 API-selected frequency centers per band
• Maximum ±12 dB boost/cut per band
• Shelf/Peak switching on Bands 1 & 3
• Proportional Q narrowing at extremes
• Fully discrete 500 Series design
• High headroom and low noise performance
• Reissued in 2004 in original modular form
• Timeless API tone and character
• Durable, studio-grade construction