Throw the Sound Block in a bag, trunk, or anywhere cable and misc. audio supplies are stored. The heavy‑duty construction and passive electronics make the Sound Block nearly indestructible. This Direct Interface is extremely versatile as a Lo to Hi‑Z transformer for electric instruments and devices to XLR mic inputs or as Lo‑Hi‑Z to use a microphone with a guitar amp (not recommended only because guitar amps make terrible PAs). High level outputs from active instruments and even speaker outputs are not a problem when using the ‑20 or ‑40 db attenuator switch. The Sound Block is a very easy to use passive device. Simply plug your 1/4" output from a guitar or electric piano, plug an XLR cable into your mixer's channel input, and you're done. A ground lift is provided for use in older buildings with janky wiring or if circuits are different from stage to where the sound system is located. Features: Heavy‑duty 14 gauge steel construction Bidirectional impedance matching Use with high output signals, including speakers ‑20dB and ‑40dB pad options Easy to use passive electronic device Control hum and buzz from stage with the ground lift 50 ohms TRS parallel input impedance 50 ohms TRS Parallel output impedance 600 ohms XLR‑M balanced input and output impedance Support Files: Quick User Guide (Apr 29, 2016) Monoprice™, Stage Right™, the Stage Right logo, and all Monoprice logos are trademarks of Monoprice Inc. Updated Feb 15, 2022 Warning: This product may contain a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.P65Warnings.ca.gov