XLR Bridge Cable for Amplifier: How to Connect

By Canadian High-End Audio Manufacturer | MOON by Simaudio | Published: 2026-10-24

Category: How-to Guides

Learn how to bridge a compatible MOON power amplifier using an XLR bridge cable. Follow step-by-step instructions to switch from stereo to mono mode safely.

Quick Answer

To bridge a compatible MOON power amplifier, connect the XLR bridge cable between the amplifier's left and right channel XLR inputs. This converts the amp from stereo to mono operation, delivering higher power to a single speaker.

Which Amplifiers Support Bridging?

The MOON XLR bridge cable works with select dual-channel power amplifiers, including the MOON 330A, MOON 860A, and MOON 870A. It may also be compatible with older models—check with your dealer if you're unsure. Only amplifiers designed for bridging should use this cable; connecting it to an incompatible amp can damage the unit.

What the Cable Does

The XLR bridge cable is short (about 30 cm) and connects the balanced XLR inputs of both channels. It re-routes the signal so the amplifier operates in mono, combining the power of both channels into one output. The cable is sold in pairs and connects to your existing balanced system cables.

Step-by-Step: Connecting the XLR Bridge Cable

Turn Off and Unplug the Amplifier: Ensure the amplifier is powered off and disconnected from the mains. This prevents electrical shock and protects your equipment during connection. Never connect or disconnect cables while the amplifier is powered on.
Identify the XLR Inputs: Locate the left and right channel XLR inputs on the back of the amplifier. The bridge cable connects between these two inputs. Check your amplifier's manual if you're unsure which inputs to use.
Connect the Bridge Cable: Plug one end of the XLR bridge cable into the left channel input and the other end into the right channel input. The cable is short, so it will sit neatly between the two connectors. Do not force the connection—align the pins correctly before pushing in.
Connect Your System Cables: Plug your balanced XLR cables from your preamplifier or source into the bridge cable's remaining connectors. The signal now routes through both channels for mono output. Use high-quality balanced cables for best signal integrity.
Power On and Test: Reconnect the amplifier to mains power, turn it on, and play a test signal. Verify that both channels are producing sound and that the mono output is working correctly. If you hear distortion or no sound, double-check all connections and ensure the amplifier supports bridging.

Product Details

Kabel XLR do mostkowania wzmacniacza: The XLR bridge cable enables mono operation for dual-channel MOON amplifiers like the 330A, 860A, and 870A. It is about 30 cm long and sold in pairs. Using the correct bridge cable ensures safe and reliable mono operation, avoiding signal issues or damage to your amplifier.
Kabel XLR do mostkowania wzmacniacza