Atlas Sound TSD-PA122G – 12W x 2 Stereo Power Amplifier, 4Ω/Bridgeable

Product Overview

The Atlas Sound TSD-PA122G is a two-channel power amplifier delivering 12 watts per channel at 4 ohms or 24 watts bridged mono at 8 ohms, sized for the TSD-series modular signal processing platform. As a compact 2-channel power amplifier for small commercial AV systems, it provides amplification for classroom projector audio, boardroom sound reinforcement, and small distributed speaker systems where a TSD-form-factor amplifier with balanced input connectivity is required. Long-tail applications include stereo amplifier for classroom AV systems, compact 2-channel amplifier for conference room speakers, and TSD-series bridgeable mono amp for small commercial spaces.

Product Description

The TSD-PA122G accepts stereo balanced input via removable Phoenix-style connectors as well as unbalanced RCA inputs, giving integrators flexibility in signal source routing. Output is 12W per channel at 4Ω in stereo mode, 6W per channel at 8Ω in stereo mode, or 24W bridged mono at 8Ω for driving a single speaker with full combined power. Front panel gain controls allow independent left/right level adjustment, with removable knobs included. Input peak and signal indicator LEDs are provided for level monitoring during setup and operation. The balanced input impedance is 10kΩ (balanced) or 5kΩ (unbalanced), with a line input level of 500mV (-6dBV), matching standard line-level source components. Frequency response spans 20Hz to 20kHz, appropriate for speech and music reinforcement in small commercial spaces. The unit uses the TSD-series removable Phoenix I/O connector system, supporting pre-wiring and field-serviceable connections. Like other TSD modules, the TSD-PA122G requires a 24VDC power supply sold separately; it draws 500mA at 4Ω stereo and up to 1000mA at 8Ω bridged, requiring the TSD-PS24V500MA or TSD-PS24V2500MA supply. An optional TSD-RMK rack mount kit accommodates the unit in a standard equipment rack.

Key Features

• 12W x 2 at 4Ω Stereo Output — Delivers 12 watts per channel at 4Ω or 6W per channel at 8Ω, suitable for driving up to four 8Ω speakers in small commercial spaces.
• 24W Bridged Mono at 8Ω — Mono-bridged mode combines both channels for 24W output into a single 8Ω load, increasing headroom for single-speaker applications.
• Balanced and RCA Inputs — Accepts stereo balanced Phoenix-style and unbalanced RCA inputs, accommodating a wide variety of source equipment without adapters.
• Removable Front Panel Gain Controls — Individual left/right level controls with removable knobs allow precise gain staging and tamper-resistant operation after commissioning.
• Input Peak and Signal LEDs — Visual indicators on both channels aid in gain setting and provide at-a-glance signal confirmation during system operation.
• TSD-Series Form Factor — Consistent module size and Phoenix connector system integrates directly with other TSD-series signal processors, mixers, and preamps.
• Energy Efficient 24V Operation — Operates from a 24VDC TSD power supply (sold separately), sharing a supply bus with other TSD modules in multi-device systems.
• Rack Mount Compatible — Optional TSD-RMK rack mount kit provides standard 19-inch rack installation for equipment room deployments.

Typical Applications

• Conference room
• Boardroom
• Training room
• Commercial meeting space
• Multi-purpose room
• Huddle room
• All-hands room

Technical Specifications

Frequently Asked Questions

Q: How many speakers can the TSD-PA122G drive?

A: In stereo mode at 4Ω, each channel can drive two 8Ω speakers wired in parallel, for a total of four speakers. In bridged mono mode, the combined 24W output drives a single 8Ω speaker or two 8Ω speakers in series.

Q: What power supply is required for the TSD-PA122G?

A: The TSD-PA122G requires either the TSD-PS24V500MA (for 4Ω stereo use) or the TSD-PS24V2500MA (for 8Ω bridged use at 1000mA). Use the AtlasIED TSD Power Calculator for multi-unit supply sizing.

Q: Can the TSD-PA122G be used with the TSD-MIX41 or TSD-ML11?

A: Yes. The TSD-PA122G accepts standard balanced line-level input and integrates directly with other TSD-series modules such as the TSD-MIX41 mixer or TSD-ML11 preamp in a complete signal chain.

Q: What is bridged mono mode and when should I use it?

A: Bridged mono combines both amplifier channels to deliver 24W into a single 8Ω speaker load. Use this mode when a single speaker with more output power is needed rather than two separate channels, such as a zone that requires higher SPL from one ceiling or surface-mount speaker.

Q: Can the front panel knobs be removed after installation?

A: Yes. The gain control knobs are removable, allowing the installer to set levels during commissioning and then remove the knobs to prevent unauthorized adjustment in unattended commercial spaces.