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Class TD amplifiers are the top choice for live sound and concerts because they combine the sonic accuracy of Class AB with the efficiency of Class D. Auway Audio's TD Series—spanning the TD800, TD1200, and TD1500—delivers between 2x800W and 2x1500W at 8Ω in a compact 2U chassis, making each model a strong contender depending on venue size and power requirements.
Live sound professionals face a recurring dilemma: power or fidelity? Push too hard with an inefficient amplifier, and you're dealing with heat, distortion, and shortened gear life. Play it safe with a lower-output unit, and your system runs out of headroom mid-show. The Class TD power amplifier was engineered to resolve exactly that conflict.
This guide breaks down what makes the Class TD amplifier different from other amplifier topologies, why it excels in concert and live sound environments, and how to choose the right model from Auway Audio's TD Series for your specific application.
Class TD is a hybrid amplifier topology that fuses Class AB and Class D technology into a single circuit. Class AB delivers the warm, natural sound reproduction that audio engineers trust for vocals and acoustic instruments. Class D, on the other hand, operates with high switching efficiency, generating less heat and drawing less power from the mains.
A Class TD power amplifier uses a tracking power supply that adjusts its voltage rail in real time based on the audio signal. The result: the output transistors always operate close to their most efficient point, without sacrificing the linearity that Class AB is known for.
For live sound, this matters. Touring amplifiers spend hours running at high output levels. An efficient digital power amplifier runs cooler, requires less cooling infrastructure, and is far less likely to go into thermal protection during a four-hour festival set.
Pure Class D amplifiers are efficient, but they've historically struggled with audio coloration at high output levels and can introduce high-frequency noise from switching artifacts. Class TD sidesteps these weaknesses by using Class AB output devices—the same transistors found in high-end studio gear—while borrowing Class D's efficient supply tracking architecture.
The practical outcome is a TD amplifier that measures <0.05% THD+N across the full 20Hz–20kHz bandwidth, maintains a damping factor above 400 for tight, articulate bass, and achieves slew rates of 40V/μs for clean transient reproduction. That's studio-reference performance in a road-ready chassis.
Choose a Class TD amplifier if sonic accuracy and efficiency both matter. Choose pure Class D if efficiency is your sole priority and audio coloration is an acceptable trade-off.
Auway Audio's TD Series includes four Class TD power amplifiers—the TD800, TD1000, TD1200, and TD1500—all sharing the same core circuit architecture and 2U rack footprint. The TD800, TD1200, and TD1500 cover the widest range of applications and are the most commonly specified for live sound.
The TD800 delivers 2x800W at 8Ω (2x1200W at 4Ω) and bridges to 2400W mono at 8Ω. It's the most accessible entry point in the TD Series without any compromise in audio performance. The TD800 Class TD amplifier is well-suited for medium-scale PA systems, stage monitor amplification, and corporate event rigs where headroom matters but total wattage requirements are moderate.
Its 85%+ power efficiency rating means it runs cooler than comparable Class AB units—an important consideration when stacking multiple amplifiers in a tour rack.
The TD1200 sits at the midpoint of the TD Series, producing 2x1200W at 8Ω (2x1800W at 4Ω) and 3600W bridged mono at 8Ω. This is the model most often specified for concert venues, large houses of worship, and nightclub main systems.
Running at 90% efficiency, the TD1200 Class TD power amplifier sustains high output across long events without thermal throttling. Its dual-wound, oxygen-free copper toroidal transformer eliminates power supply noise, while 24k gold-plated Speakon outputs ensure consistent connectivity under repeated use.
The TD1500 is the flagship of the TD Series. At 2x1500W at 8Ω (2x2250W at 4Ω) and 4500W bridged at 8Ω, it's one of the most powerful 2U amplifiers in its class. Auway rates its conversion efficiency at 92%—industry-leading for a TD class amplifier of this output level.
An 8-stage protection network covers everything from DC offset detection to infrasonic filtering, power rail monitoring, and soft-start circuitry. For stadium-scale touring, megachurch installations, or EDM festival rigs, the TD1500 delivers the kind of headroom that prevents clipping during unexpected signal peaks.
Spec | TD800 | TD1200 | TD1500 |
|---|---|---|---|
Stereo Output @ 8Ω | 2x800W | 2x1200W | 2x1500W |
Stereo Output @ 4Ω | 2x1200W | 2x1800W | 2x2250W |
Bridge Mono @ 8Ω | 2400W | 3600W | 4500W |
THD+N | <0.05% | <0.05% | <0.05% |
Frequency Response | 20Hz–20kHz (±0.3dB) | 20Hz–20kHz (±0.3dB) | 20Hz–20kHz (±0.3dB) |
Damping Factor | >400 | >400 | >400 |
Slew Rate | 40V/μs | 40V/μs | 40V/μs |
Efficiency | 85%+ | 90% | 92% |
Rack Space | 2U | 2U | 2U |
Input | XLR Balanced | XLR Balanced | XLR Balanced |
Output | Speakon | Speakon | Speakon |
Power Supply | 220–240V AC | 220–240V AC | 220–240V AC |
All three models share the same input sensitivity options (0.775V / 1.0V / 1.4V switchable), a balanced input impedance of 20kΩ, and cross-talk rejection above 70dB.
The right TD amplifier depends on three variables: venue size, speaker load impedance, and whether you're running stereo or bridged mono.
Small-to-medium live events (clubs, theaters, corporate events): The TD800 provides ample headroom for most PA and monitor applications. It's the lightest and most compact option in the series.
Large venues and touring rigs: The TD1200 hits the sweet spot between output power and weight. At 19.5 kg, it's manageable for road cases while delivering enough wattage to drive full-range line array elements.
Stadium and festival-scale systems: The TD1500 is the clear choice when maximum output is non-negotiable. At 4500W bridged into 8Ω, a single unit can drive high-sensitivity subwoofer stacks with significant headroom to spare.
Every model in the TD Series includes a multi-stage protection network that covers thermal management with auto-recovery, short-circuit protection, DC fault detection, and output relay switching. In live environments, where signal chain errors happen, this level of protection can prevent a faulty cable from taking out a speaker system mid-show.
Front-panel status indicators—power, signal, clip, and protection—give engineers immediate visual feedback without pulling out a meter. True balanced XLR inputs reject common-mode noise, which is essential in environments with long cable runs or high RF interference.
A Class TD power amplifier gives live sound engineers something that used to require trade-offs: studio-grade audio quality at professional power levels, without the heat and energy consumption of traditional Class AB designs. Auway Audio's TD Series puts that technology into a proven, road-ready platform at three output levels.
Whether you're building a monitor rig for a mid-size club or specifying main amplification for a large-scale touring system, the TD800, TD1200, or TD1500 offers the right combination of power density, audio performance, and thermal reliability to keep the show running. Contact Auway Audio to discuss the right TD amplifier for your specific application.
Class TD refers to a hybrid amplifier topology that combines Class AB output circuitry with a Class D-style tracking power supply. The tracking supply adjusts the rail voltage dynamically based on the audio signal, improving efficiency while preserving the low distortion and sonic accuracy associated with Class AB designs.
Class TD amplifiers typically offer lower THD, a flatter frequency response, and better transient accuracy than standard Class D designs. Class D is more efficient in terms of raw power conversion, but Class TD delivers audiophile-grade performance alongside high efficiency—making it better suited for applications where audio quality is critical.
For stadium-scale applications, the Auway TD1500 is the strongest option in the TD Series. It delivers 2x1500W at 8Ω (4500W bridged mono) with 92% efficiency, a damping factor above 400, and an 8-stage protection system. Its compact 2U format also makes it practical for high-density rack builds.
Yes. All models in the TD Series support bridge mono operation. The TD800 bridges to 2400W at 8Ω, the TD1200 to 3600W at 8Ω, and the TD1500 to 4500W at 8Ω, providing significant output flexibility for subwoofer and mono center-cluster applications.
Yes. The Auway TD Series is designed for both applications. Universal voltage operation (220–240V AC), auto-recovery thermal protection, and a standard 2U rack form factor make these amplifiers appropriate for permanently installed systems in churches, performance venues, and conference centers, as well as mobile touring rigs.
