Homebrew Cask for SystemEQ for Mac

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System-wide parametric equalizer for macOS 13+ — main repository.

Installation

brew tap denzam/systemeq
brew trust denzam/systemeq
brew install --cask systemeq

Since Homebrew 6.0, third-party taps must be trusted explicitly before Homebrew will load them — without brew trust the install fails with Refusing to load cask ... from untrusted tap. A tap owner cannot grant this on your behalf, so it is a one-time command on each Mac. On Homebrew 5 and older the command does not exist; skip it there.

The cask automatically removes the macOS quarantine attribute on install, so the app launches without any Gatekeeper warning (SystemEQ is ad-hoc signed, not notarized with an Apple Developer ID — see the main README for the rationale).

Update

brew upgrade --cask systemeq

Uninstall

brew uninstall --cask systemeq

The cask's zap stanza also cleans up Application Support, Preferences and Caches:

brew uninstall --cask --zap systemeq

Troubleshooting

Error: Refusing to load cask ... from untrusted tap

Homebrew 6.0 will not load a third-party tap until you mark it as trusted, and a tap owner cannot grant that for you. Run this once per Mac, then install or upgrade as usual:

brew trust denzam/systemeq
brew upgrade --cask systemeq   # or: brew install --cask systemeq

On Homebrew 5 and older the trust command does not exist — skip it.

The app asks for microphone access again after an update

Expected. SystemEQ is ad-hoc signed, so its signature changes with every build and macOS treats each update as a new app. Grant it again in System Settings → Privacy & Security → Microphone.

Requirements

• macOS 13 (Ventura) or later
• Apple Silicon or Intel Mac
• BlackHole 2ch (free virtual audio driver, installed via the in-app Setup Assistant)

For maintainers — updating the cask after a new release

1. Wait for the GitHub release workflow to publish SystemEQ-v<version>.dmg.
2. Compute the SHA-256 of the published DMG:

   curl -sL https://github.com/denzam/SystemEQ-for-Mac/releases/download/v<version>/SystemEQ-v<version>.dmg | shasum -a 256

3. In Casks/systemeq.rb bump version and replace sha256.
4. Commit and push:

   git commit -am "Bump SystemEQ to v<version>"
   git push

5. Verify locally:

   brew update
   brew info --cask denzam/systemeq/systemeq

License

The cask formula in this repository is released under the same license as SystemEQ for Mac itself — GNU GPL v3.