ATI Model 1822 Class AB Modular 2 / 8 Channel Power Amp

Description

Heritage & Reputation

ATI’s founder Morris Kessler has been designing amplifiers since the late 1960s, beginning with the legendary SAE (Scientific Audio Electronics) brand. Those original SAE Class AB amplifiers set new benchmarks for performance, value, and reliability, and became staples in high-end home audio systems.

The AT1820 Series carries that tradition forward: musical warmth, rugged build, and honest specifications — design principles that have stood the test of time.

“The ATI AT1820 Series is a well-regarded choice for audiophiles and home theater enthusiasts seeking a powerful, reliable, and high-performing amplifier at a competitive price point. Its combination of superior sound, robust build, and advanced features makes it a strong contender in the Class AB amplifier market.” — Google AI

Reviews on AVS Forum echo this reputation, praising the AT1820 Series for its: 

• Excellent sound quality with a low noise floor

• 200W per channel clean Class AB power with high current drive

• Robust construction and toroidal transformer design

• Soft-turn-on and optically-coupled protection systems for peace of mind

• Real-world performance that drives demanding speakers with ease

In the Listening Room

With the AT1820 Series in your system, you’ll notice the effortless power and control of true Class AB amplification. For two-channel music listening, the presentation is warm, dynamic, and richly detailed — vocals emerge naturally, instruments have weight and texture, and quiet passages are delivered against a black background thanks to the amp’s ultra-low noise floor.

Switch to multichannel home theater, and the AT1820 Series transforms the experience into something truly immersive. Explosions hit with chest-thumping impact, subtle effects swirl around the room with pinpoint precision, and dialogue remains crystal clear even during the most demanding action sequences. Each channel has its own dedicated high-current power, ensuring your speakers are driven with authority, no matter how complex the soundtrack.

Whether you’re spinning vinyl, streaming hi-res audio, or watching the latest blockbuster in Dolby TrueHD or DTS-HD Master Audio, the AT1820 Series delivers a performance that is musical, powerful, and utterly engaging — exactly what you’d expect from Morris Kessler’s Class AB legacy.

Key Features & Technology

• Class AB Topology – Smooth, natural sound reproduction

• Toroidal Transformers – 40% more efficient than EI types; bi-filar windings for each channel reduce crosstalk

• Soft Turn-On Circuitry – Prevents tripped breakers and light dimming

• Protection Circuits – Optically coupled with full automatic reset

• High-Current Output Stage – 4 bipolar output devices per channel for real-time response

• Power Supply Headroom – 22,400µF capacitance per channel

• Connections – Balanced XLR & unbalanced RCA inputs with gold-plated 5-way binding posts

• Remote Trigger – Activated from 3.3VDC to 24VDC

• Silent Cooling – Large external heat sinks for natural convection

• Build Quality – Double-sided FR-4 glass-epoxy circuit boards, assembled in California

• Detachable IEC Power Cord – With NEMA 5-15 (USA), BS 1363 (UK), or Schuko (EU) plug

• Form Factor – 4RU / 7.75″ height, optional 19” rack-mount kit

• Warranty – 7 years, parts and labor

Ordering Notes

• The AT1820 Series is special order, custom-built

• Allow lead time for assembly and testing

• Free shipping in the lower 48 states