Metric Halo Mute-A-Rang Monitor Mute Kit

Add relay mutes to your existing 3d-based ULN-8 or LIO-8 unit.

This upgrade provides relay mutes for the monitor output paths on your unit without requiring a full mkIV upgrade.

The Mute-A-Rang is already included as part of the mkIV units and mkIV Upgrades, and is not needed for mkIV units.