491 Network Player Preamplifier: Inputs and Outputs Explained

By Canadian High-End Audio Manufacturer | MOON by Simaudio | Published: 2026-11-05

Category: How-to Guides

Learn how to connect the MOON 491 Network Player / Preamplifier to your power amplifier and sources, with a clear step-by-step guide to its inputs and outputs.

Quick answer

Connect your sources to the MOON 491’s digital or analog inputs, then run its preamplifier outputs to your power amplifier. The 491 combines network playback, preamplification, DAC, phono, and headphone listening in one component, so most systems need only the 491 and a power amp.

Why the 491 simplifies system wiring

The MOON 491 is designed as the heart of a Compass Collection system. It handles network streaming, digital-to-analog conversion, phono playback, and headphone listening, which means you can connect digital sources, a turntable, and headphones without adding separate boxes. The trade-off is that you must plan input assignments carefully, because the 491’s flexibility can lead to confusion if every source is not labeled and leveled correctly.

When to use the 491 as a preamplifier only

If you already own a high-quality integrated amplifier with its own preamp section, you might use the 491 as a source rather than a preamplifier. In that case, connect the 491’s analog outputs to an integrated amp’s line input and set the 491’s volume to a fixed level if possible. This approach avoids stacking two volume controls, but it bypasses the 491’s preamp stage and may not suit systems where the power amp needs a dedicated preamp.

Step-by-step connection guide

Power down all equipment: Turn off the 491, your power amplifier, and all source components before making any connections. This prevents loud pops or damage. Double-check that every component is off and unplugged from AC power before proceeding.
Connect digital sources to the 491’s digital inputs: Use the appropriate cable (optical, coaxial, or USB) to connect your network streamer, CD transport, or TV to the 491’s digital inputs. Assign each input a name in the setup menu for easy identification. Avoid using both a digital and analog connection from the same source unless you plan to switch between them.
Connect analog sources to the 491’s analog inputs: Plug your turntable into the phono input (if equipped) and other line-level sources into the analog inputs. Never connect a line-level source to the phono input. Check that the phono input is set for the correct cartridge type (MM or MC) if the 491 offers that option.
Connect the 491’s preamplifier outputs to your power amplifier: Use high-quality RCA or XLR cables to connect the 491’s preamp outputs to the corresponding inputs on your power amplifier. Match left and right channels carefully. If your power amp has both RCA and XLR inputs, use only one type to avoid ground loops.
Connect headphones if needed: Plug your headphones into the 491’s headphone jack. The 491 typically mutes the preamp outputs when headphones are inserted, so verify this behavior in the menu. If you want speakers and headphones active simultaneously, check whether the 491 supports that mode.
Power on in sequence: Turn on source components first, then the 491, and finally the power amplifier. This order minimizes turn-on transients. Start with the 491’s volume at minimum and raise it gradually.
Set volume and balance: Play a familiar track and adjust the 491’s volume to a comfortable level. Use the balance control if the center image is off. If the sound is distorted at low volume, check that the 491’s output level matches your power amp’s input sensitivity.

Product facts

491 Network Player / Preamplifier: The MOON 491 brings together network playback, preamplification, digital-to-analog conversion, phono playback, and headphone listening in one component. You can connect digital and analog sources directly to the 491, reducing the number of separate components in your system.
491 Network Player / Preamplifier