bx_subfilter
bx_subfilter is a free low-end filtering plugin from Brainworx, distributed through Plugin Alliance. It provides a resonant high-pass filter (Tight Punch knob), resonance peak selector, and fixed bandpass filter control for shaping and clarifying bass-heavy tracks. Available in AAX Native, AAX DSP, AAX AudioSuite, AU, VST2 and VST3 formats, it runs as a plugin within Avid Pro Tools and other compatible DAWs. The plugin is simple to use with just four main controls, making it popular for mixing engineers and producers who need quick low-end management without complex EQ interfaces.
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1 suggestionbx_subfilter is an AAX plugin for Pro Tools, not a standalone application. According to Plugin Alliance's changelog, the AAX version added native Apple Silicon compatibility in version 1.9.0 (August 2023), so if you are running an older version of the plugin under Rosetta 2, you should update to the latest release to take advantage of native performance on your Mac. Update bx_subfilter through the Plugin Alliance Installation Manager: visit plugin-alliance.com, sign into your account, download the Installation Manager, and use it to select, download and install the latest version of bx_subfilter in AAX format for your system. Make sure Pro Tools itself is also on a current native build (version 2023.6 or later); you can update Pro Tools through Avid Application Manager or within Pro Tools via Help → Check for Updates. Once both Pro Tools and bx_subfilter are running natively, you will see lower CPU usage and improved stability.
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