This audio effect plugin emulates a classic American equalizer from the late 1960s, offering four bands of equalization with selectable frequencies and proportional Q. It provides a wide range of tonal variations for professional audio manipulation and can be used as a standalone app or an AUv3 plugin.
3.0.3
January 2, 2026
- Fixed parameters Automation bug. If you like EQ550b plug-in, please support us by rating this app in the App Store!
More$4.99
RRS EQ550b Unlimited
RRS EQ550b Unlimited
The EQ550b comes as a time-limited demo version, offering 5 minutes of free play time. You can reload the plugin as many times as you want to re-access the demo period.
The unlimited version of the EQ550b AUv3 plugin is available as an In-App Purchase. The base app is free to download and try.
EQ550b is supported on iPhone, iPad, and iPod. It requires an AUv3-compatible host app to function as a plugin.
The latest version of EQ550b is 3.0.3, last updated on January 2, 2026. This indicates a commitment to ongoing development and improvements.
EQ550b has an age rating of 4+, making it suitable for a wide range of users. The app's focus is on audio processing rather than content unsuitable for younger audiences.
Proportional Q narrows the filter's bandwidth at higher boost/cut settings and widens it at minimal settings. This unique feature helps minimize the phase-shift sound often found in other equalizers.
Yes, EQ550b can be used as an AUv3 plugin with compatible host apps such as GarageBand, Auria, AUM, and Cubasis. It will appear in the list of available audio unit extensions.
EQ550b offers Stereo (Mono), Mid, or Side EQ modes, allowing for flexible audio manipulation and targeted equalization of different parts of the stereo image.
