3 x 1 Mic/Line Mixer

The AtlasIED TSD-MIX31RL is a compact 3-input, 1-output mic/line mixer built around a straightforward signal path: two mic/balanced line inputs on removable Phoenix-style connectors, plus a dual-RCA input that sums stereo material. It provides a practical way to bring microphone, balanced line, and unbalanced stereo sources together at one output. Its 4-inch-wide, 1.5-inch-high, 2.5-inch-deep enclosure weighs 6 oz, making the format easy to account for when planning limited equipment space.

Ideal Use Cases

This mixer is suited to signal chains that need to combine exactly the source types stated in the specification. The two mic/balanced line inputs accommodate microphone-level or balanced line-level feeds through removable Phoenix-style connections, while the dual-RCA input accepts a stereo source and sums it for the single output. That layout makes the TSD-MIX31RL a focused choice when a design calls for two mic or balanced sources alongside one stereo RCA source, all feeding one downstream connection. The 3 x 1 topology also keeps source and destination planning clear: three inputs are mixed to one output.

Why Choose This Model

The value of this model is its combination of input flexibility and defined audio specifications in a very small enclosure. Microphone input is listed at 46dB gain and 10mV (-40dBV) balanced. The line specification lists 1V (0dBV) balanced input and 2V (+6dBV) balanced output. For compatible microphones, 24VDC phantom power is available and defeatable. A defeatable 125Hz/12dB low-cut filter provides another stated option for configuring the incoming signal path.

• Two removable Phoenix-style mic/balanced line inputs
• One stereo-summing dual-RCA input
• Balanced and unbalanced output impedance specifications
• Defeatable phantom power and low-cut filtering
• Compact dimensions of 4 inches wide by 1.5 inches high by 2.5 inches deep

Installation and Integration

The physical format supports compact equipment planning. At 4 inches wide, 1.5 inches high, and 2.5 inches deep, the mixer can be placed within a constrained equipment area; its listed weight is 6 oz (.165 kg). The two mic/balanced line sources connect through removable Phoenix-style connectors, and the stereo source connects through the dual-RCA input. The published power requirement is 24VDC at 60mA, with voltage compatibility listed as 24V.

During integration, source type and level should be matched to the published input figures. The unbalanced input impedance is listed as 10KΩ. A separate balanced-input specification lists 1.2KΩ balanced and 600Ω unbalanced. Phantom power and the low-cut filter are both identified as defeatable, allowing their settings to be selected according to the connected source and intended signal path.

Performance Highlights

The specified frequency response is 20Hz to 20kHz (+/-1dB). Signal-to-noise ratio is listed at 85dBV for line-to-line operation and 70dBV for mic-to-line operation. THD is supplied as .06% & 1kHz. Output impedance is specified at 300Ω balanced or 150Ω unbalanced.

Level figures provide additional integration references. Input level is listed at 316mV (-10dBV), microphone input at 10mV (-40dBV) balanced with 46dB gain, and line input at 1V (0dBV) balanced. The same line-input specification lists a 2V (+6dBV) balanced output. Together, these values let a system designer compare connected equipment against the mixer’s published mic, line, and output conditions before installation.

What Makes It Different

What distinguishes the TSD-MIX31RL within the supplied information is its specific combination of removable Phoenix connections and a dual-RCA stereo input in one 3 x 1 device. The RCA pair is not listed as two independent inputs; it is identified as a stereo-summing input. At the same time, the other two inputs accept mic or balanced line sources. The ability to defeat both 24VDC phantom power and the 125Hz/12dB low-cut filter adds explicit setup choices without changing the basic three-input, one-output architecture. Its dimensions and 6 oz weight reinforce its compact, focused role.

Final Assessment

The AtlasIED TSD-MIX31RL is a well-defined option for a system that specifically needs two mic/balanced line sources, one stereo RCA source summed into the mix, and a single output. Its principal decision points are concrete: removable Phoenix-style input connectors, dual-RCA summing, 20Hz-20kHz response, defeatable 24VDC phantom power, defeatable low-cut filtering, and 24VDC/60mA operation. A 36-month warranty from the date of purchase completes the published specification set.