EQ550 is a versatile audio equalization plug-in available for iPhone. Developed by RRS OOO, this multimedia tool falls under the Music & Radio category. The EQ550 AUv3 plug-in offers a time-limited demo version with 5 minutes of free playtime, which can be reloaded for repeated demo periods. The full version is accessible via in-app purchase.

The EQ550 accurately captures the essence of iconic American EQs from the late 1960s, delivering punch, low-frequency transparency, and precise imaging. It features 3 bands of classic American equalization with 7 selected frequency centers each, providing up to 15dB of boost/cut per band. The Proportional Q feature adjusts filter bandwidth intuitively, minimizing phase-shift artifacts commonly found in other equalizers.