Atlas Sound TSD-RL21 – 2x1 Mic/Line Mixer with Remote Level

Product Overview

The Atlas Sound TSD-RL21 is a 2-input, 1-output mic/line mixer designed for commercial paging, public address, and background music (BGM) distribution systems. This compact two channel mixer integrates a balanced mic/line input and a stereo summing RCA input, making it a practical choice for conference center meeting rooms, gymnasiums, retail environments, and hospitality venues requiring multi-source audio control. Long-tail keyword applications include remote-controllable BGM mixer for 70V systems, Atlas TSD series mixer for public address, and wall-plate-compatible audio mixer for commercial AV.

Product Description

The TSD-RL21 operates as either a standalone remote mixer or in conjunction with AtlasIED power amplifiers, providing flexible deployment across a wide range of fixed-install AV projects. Channel one is user-configurable via rear-panel dipswitch to accept mic or balanced line level signals, while channel two features a stereo summing RCA input for typical BGM source connections. Both input channels include front-panel level controls with removable knobs that can be swapped for tamper-resistant security covers in public or semi-supervised installations. The remote level control output supports connection to an AtlasIED AAVC-10K decorative wall plate volume control or equivalent, allowing end-user adjustment of either the full mix bus or the RCA input 2 independently. Balanced mono line output provides high-gain drive capability for long cable runs to amplifier inputs without signal degradation. Removable Phoenix-style connectors simplify field wiring and reduce installation time. The unit operates from a single 24VDC power supply (sold separately), draws only 60mA, and meets Energy Star efficiency requirements. Multiple TSD modules can share a single power supply, reducing rack overhead for multi-device deployments. A 36-month warranty underscores the product's reliability in permanent commercial installations.

Key Features

• Configurable Channel 1 — Rear-panel dipswitch selects mic or balanced line level input to match source requirements.
• Stereo Summing RCA Input — Channel 2 accepts stereo consumer-level sources and sums to mono for amplifier compatibility.
• Remote Level Control — Assignable to full mix bus or Input 2 only; compatible with AAVC-10K wall plate volume control.
• Balanced Mono Line Output — 300Ω balanced / 150Ω unbalanced output drives long cable runs to distributed amplifiers.
• Input and Peak Signal LEDs — Front-panel indicators for monitoring signal presence and clip conditions.
• Removable Security Knob Covers — Included covers replace exposed knobs to prevent unauthorized level adjustments.
• Removable Phoenix-Style I/O Connectors — Field-replaceable connectors simplify installation and service.
• Energy Star Compliant — 60mA draw at 24VDC; multiple units can share a single TSD power supply.
• Compact TSD Form Factor — 1.5" x 4" x 2.5" chassis compatible with TSD rack mount kits.

Typical Applications

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

Technical Specifications

Frequently Asked Questions

Q: Does the TSD-RL21 require a dedicated power supply?

A: Yes. The TSD-RL21 operates on 24VDC and requires a TSD series power supply sold separately. Because it draws only 60mA, a single TSD power supply can run multiple TSD devices simultaneously. Use the AtlasIED TSD Power Calculator to determine which supply is appropriate for your installation.

Q: Can Channel 1 accept a microphone signal?

A: Yes. Channel 1 is configurable via a rear-panel dipswitch to accept either mic level or balanced line level input. The mic input provides 46dB of gain and accepts signals down to 10mV (-40dBV) balanced.

Q: What type of wall plate volume control is compatible with the remote level feature?

A: The TSD-RL21's remote level control is designed to work with the AtlasIED AAVC-10K decorative wall plate volume control or any equivalent 10KΩ potentiometer control. The remote level can be assigned to control either the full mix bus or the RCA Input 2 independently.

Q: Can the front-panel controls be secured against tampering?

A: Yes. The TSD-RL21 includes security covers that replace the front-panel knobs, preventing unauthorized adjustment of input levels. This is particularly useful in retail, hospitality, or public-facing installations.

Q: What connector types are used on the TSD-RL21?

A: The unit uses removable Phoenix-style connectors for balanced inputs and outputs, which simplify field installation and future service. The RCA stereo summing input uses standard RCA jacks.

Q: Is the TSD-RL21 compatible with 70V amplifier systems?

A: The TSD-RL21 outputs a balanced mono line-level signal intended to feed the input of a power amplifier or mixer amplifier, including those driving 70V/100V distributed speaker systems. It does not connect directly to speaker loads.

Q: What is the output drive capability for long cable runs?

A: The balanced line output features a high-gain output stage with 300Ω balanced output impedance, designed to drive long balanced cable runs from the mixer to remote amplifier locations without significant signal degradation.