Atlas Sound TSD-MIX31RL – 3x1 Mic/Line Mixer with Priority and Remote Level

Product Overview

The Atlas Sound TSD-MIX31RL is a three-input mic/line mixer that combines two balanced mic/line inputs with a stereo RCA line input, priority paging, remote level control, and a variable output limiter in the compact TSD-series form factor. As a 3x1 mic/line mixer with VOX priority and remote level control, it is well-suited for commercial distributed audio installations where background music and paging must coexist without manual intervention. Primary use cases include restaurant paging with BGM, retail background music with announcement override, conference room mic mixing with limiter protection, and small-system mixing where a wall-plate remote volume control for background audio is required.

Product Description

The TSD-MIX31RL provides two balanced mic/line inputs via removable Phoenix-style connectors and one unbalanced stereo dual-RCA input for a background music source. Both mic inputs include switchable 24VDC phantom power for condenser microphone operation and individually defeatable 12dB/octave 125Hz high-pass filters to control bass buildup and feedback. Priority paging is available through two mechanisms: a contact closure trigger or a VOX (voice-activated) trigger on Input 1, which mutes Input 3 when an announcement signal is present, automatically dipping the background music without operator intervention. A remote level control feature accepts an AAVC-10K (or equivalent) wall-plate potentiometer, providing end-user volume control for either the full mix bus or Input 3 independently — a standard setup for background music level adjustment by non-technical staff. A variable output limiter compresses and clips protection at the output stage, reducing distortion when mixing multiple mic and line sources with varying program levels. High-gain balanced output drives long cable runs to downstream amplifiers. Security covers protect all front panel controls from unauthorized adjustment. The unit draws 60mA from a 24VDC TSD power supply (sold separately).

Key Features

• Two Balanced Mic/Line Inputs — Both inputs are mic/line switchable with 50dB of preamp gain and individually switchable 24VDC phantom power.
• Unbalanced Dual-RCA Stereo Input — Summed stereo RCA input accommodates background music sources such as media players and streaming devices.
• VOX and Contact Closure Priority Mute — Input 1 can trigger automatic muting of Input 3 via voice-activated (VOX) detection or dry contact closure for paging priority control.
• Remote Level Control — Compatible with AAVC-10K or equivalent wall-plate control for end-user volume adjustment of the mix bus or Input 3 independently.
• Variable Output Limiter — Protects the output signal from clipping and distortion when mixing multiple sources with varying levels, extending system lifespan.
• 12dB/Octave 125Hz Low-Cut Filter — Individually defeatable high-pass filter on each mic input controls bass buildup and low-frequency feedback.
• High-Gain Balanced Output — 300Ω balanced output drives long-run cable installations to remote amplifiers without signal degradation.
• Security Covers and Removable Connectors — Front panel security covers and Phoenix-style I/O connectors support installer-friendly deployment with tamper resistance in commercial environments.

Typical Applications

• Conference room
• Commercial meeting space
• Multi-purpose room
• Training room
• House of worship
• Boardroom
• All-hands room

Technical Specifications

Frequently Asked Questions

Q: How does the VOX priority mute work on the TSD-MIX31RL?

A: When a signal is detected on Input 1 (mic/line), the VOX circuit automatically mutes Input 3 (typically the background music RCA input). The sensitivity threshold is adjustable. This enables hands-free paging without requiring staff to manually lower the background music.

Q: Can I use a wall-plate volume control with the TSD-MIX31RL?

A: Yes. The remote level control feature is compatible with the AtlasIED AAVC-10K or a standard 10kΩ wall-plate potentiometer. It can control either the full mix bus level or Input 3 independently.

Q: Does the priority mute work via contact closure as well as VOX?

A: Yes. Input 1 supports both VOX (voice-activated) and dry contact closure triggers for muting Input 3, providing flexibility for integration with paging systems, door panels, or other control systems.

Q: Does the TSD-MIX31RL include a power supply?

A: No. The unit requires a 24VDC TSD power supply sold separately. The TSD-MIX31RL draws 60mA, allowing it to share a supply with other TSD-series modules. Use the AtlasIED TSD Power Calculator to select the appropriate supply.

Q: What is the purpose of the variable output limiter?

A: The limiter prevents the output from clipping when multiple inputs at varying levels are mixed together, which protects downstream amplifiers and speakers from overload and reduces distortion in the summed output.