The API 550A 500 Series 3-Band Equalizer Module is a storied gem in the realm of audio shaping, renowned since its inception in the late 60s. This legendary piece of gear, designed by the illustrious Saul Walker, has set the standard in equalizers for over four decades. Reissued in 2004, it brings vintage sonic magic to modern studios, fitting seamlessly into your 500 Series rack.

What sets the API 550A apart is its "Proportional Q" design, which intuitively narrows the filter Q at extreme settings, offering precise control without overwhelming complexity. Its three bands provide a powerful and flexible EQ experience, each with seven API-chosen frequency centers, enabling a tailored sound sculpting. With up to 12dB of boost or cut per band and the option for peaking or shelving, your mixes will gain clarity and character that only a true classic can deliver.

Designed for longevity and adaptability, the API 550A not only fits into any evolving studio setup but also promises a high-headroom performance. Its robust construction and fully discrete circuit design ensure that it remains a reliable sonic companion for years to come. Whether you're refining a vocal, adding depth to a guitar, or balancing a complex mix, the API 550A is a timeless tool that enhances every note.

Key Features:

• 3 bands of classic API equalization
• Each band offers 7 API-selected frequency centers
• Proportional Q design for dynamic response
• Maximum 12dB of boost/cut per band
• Shelf/peak switching for EQ Bands 1 and 3
• Traditional API fully discrete circuit design
• High-headroom +30dB clip level

Product specs

FAQs

What makes the API 550A 500 Series 3-Band Equalizer unique compared to other EQs?

The API 550A is renowned for its proportional Q design, which adjusts the bandwidth of the EQ curve based on the amount of boost or cut applied, offering precise tonal shaping. Its legacy and consistent sonic character make it a staple in professional studios.

Can the API 550A 500 Series EQ be used for both tracking and mixing?

Yes, the API 550A is versatile enough for both tracking and mixing applications, providing precise control over frequency adjustments with its 3-band semi-parametric EQ, making it suitable for a wide range of audio sources.

Does the API 550A 500 Series EQ require a specific type of rack to operate?

The API 550A is a 500 Series module, which requires a compatible 500 Series rack or lunchbox for power and connectivity. Ensure your rack supports the single-module slot size of the 550A.

What is the boost and cut range of the API 550A 500 Series EQ?

The API 550A offers a boost and cut range of ±12dB, allowing for substantial frequency adjustments across its three bands, providing flexibility in shaping your sound.

How does the proportional Q design of the API 550A affect its sound?

The proportional Q design of the API 550A means that the bandwidth of the EQ narrows as you apply more boost or cut, allowing for more precise adjustments and a musical response that is especially useful for sculpting frequencies.