Protection Circuits:Optically coupled with full automatic reset.Toroid Transformers:40% more efficient than EI type. Separate bi-filar windings for each channel guaranty lower noise and crosstalk.Circuit Boards:Double-sided, FR-4 glass-epoxy, computer-grade boards are assembled in-house.Soft Start Circuitry:Ultra soft turn on reduces in-rush current to a minimum. Multiple units can be turned on without tripping circuit breakers eliminating the need for sequencing.Power Transistors:High-current, bi-polar output transistors with active bias circuits result in effortless operation.

Convection Cooling with Massive Heat Sinks
The AT1820 Series uses large extruded heat sinks, one for each amplifier channel.

Huge Toroidal Transformers
The huge transformers used in ATI amplifiers employ high-grade silicon steel cores with bi-filar windings. To reduce crosstalk through the transformer, each amplifier channel gets its own set of secondary transformer windings.

Remote Triggers
All ATI amplifiers feature a 12V trigger that allows them to interface with control systems or processors so they can be turned on and off remotely.

Optical Protection Circuitry
This safety feature instantaneously stops current from flowing in the amplifier’s output under three conditions: 1) an over-current/short circuit condition, 2) high frequency oscillation and 3) an over-temperature condition. If activated, this circuit will sample the condition every 10 seconds and restore output when the problem is cleared. In case of an excessive DC offset on any channel, the amplifier will shutdown and power will need to be cycled to restore operation.

Ultra-Soft Turn-On
High power amplifiers draw a momentary, but tremendous in-rush of electrical current when you turn them on. This will not happen because of ATI’s Ultra Soft Turn-On circuitry.

Low Distortion/Low Noise
The exact “nature” of sound is a matter of individual choice and environmental conditions, however, distortion and noise are absolutely measurable in any situation. All ATI amps are at the “cutting edge” of the lowest distortion and noise possible.

Protection Circuits:Optically coupled with full automatic reset.Toroid Transformers:40% more efficient than EI type. Separate bi-filar windings for each channel guaranty lower noise and crosstalk.Circuit Boards:Double-sided, FR-4 glass-epoxy, computer-grade boards are assembled in-house.Soft Start Circuitry:Ultra soft turn on reduces in-rush current to a minimum. Multiple units can be turned on without tripping circuit breakers eliminating the need for sequencing.Power Transistors:High-current, bi-polar output transistors with active bias circuits result in effortless operation.

Features:

Convection Cooling with Massive Heat Sinks
The AT1820 Series uses large extruded heat sinks, one for each amplifier channel.

Huge Toroidal Transformers
The huge transformers used in ATI amplifiers employ high-grade silicon steel cores with bi-filar windings. To reduce crosstalk through the transformer, each amplifier channel gets its own set of secondary transformer windings.

Remote Triggers
All ATI amplifiers feature a 12V trigger that allows them to interface with control systems or processors so they can be turned on and off remotely.

Optical Protection Circuitry
This safety feature instantaneously stops current from flowing in the amplifier’s output under three conditions: 1) an over-current/short circuit condition, 2) high frequency oscillation and 3) an over-temperature condition. If activated, this circuit will sample the condition every 10 seconds and restore output when the problem is cleared. In case of an excessive DC offset on any channel, the amplifier will shutdown and power will need to be cycled to restore operation.

Ultra-Soft Turn-On
High power amplifiers draw a momentary, but tremendous in-rush of electrical current when you turn them on. This will not happen because of ATI’s Ultra Soft Turn-On circuitry.

Low Distortion/Low Noise
The exact “nature” of sound is a matter of individual choice and environmental conditions, however, distortion and noise are absolutely measurable in any situation. All ATI amps are at the “cutting edge” of the lowest distortion and noise possible.

Amplifier Topology
While there are numerous classes of amplifier design, the AT1820 Series amplifiers use the traditional Class AB topology.

Remote Trigger:

Activated from 3.3VDC to 24 VDC via a heavy-duty relay.

Protection Circuits:

Optically coupled with full automatic reset.

Toroid Transformers:

40% more efficient than EI type. Separate bi-filar windings for each channel guaranty lower noise and crosstalk.

Circuit Boards:

Double-sided, FR-4 glass-epoxy, computer-grade boards are assembled in-house.

Soft Start Circuitry:

Ultra soft turn on reduces in-rush current to a minimum. Multiple units can be turned on without tripping circuit breakers eliminating the need for sequencing.

Power Transistors:

High-current, bi-polar output transistors with active bias circuits result in effortless operation.

Thermaltrak Output Devices:

Thermaltrak devices have tracking diodes in the same package as the transistors so bias is optimized in real-time.

Power Cord:

Dual Detachable, 3-wire cord.

Dimensions:

17.25″w X 9.5″h X 18.5″d (chassis)

Weight:

88 to 138 lbs (model dependent)

Per Morris Kessler, ATI’s president and chief engineer, “We are excited to offer amplifiers with ATI’s legendary high performance and reliability in designs that reduce amplifier weight by up to 50%.”

With rated distortion below 0.05% and signal-to-noise ratio of 123 dB (minimum, referenced to rated output), each amplifier in the series is capable of playing back the full dynamic range available on today’s lossless recordings.

Features:

Convection Cooling with Massive Heat Sinks
The AT1820 Series uses large extruded heat sinks, one for each amplifier channel.

Huge Toroidal Transformers
The huge transformers used in ATI amplifiers employ high-grade silicon steel cores with bi-filar windings. To reduce crosstalk through the transformer, each amplifier channel gets its own set of secondary transformer windings.

Remote Triggers
All ATI amplifiers feature a 12V trigger that allows them to interface with control systems or processors so they can be turned on and off remotely.

Optical Protection Circuitry
This safety feature instantaneously stops current from flowing in the amplifier’s output under three conditions: 1) an over-current/short circuit condition, 2) high frequency oscillation and 3) an over-temperature condition. If activated, this circuit will sample the condition every 10 seconds and restore output when the problem is cleared. In case of an excessive DC offset on any channel, the amplifier will shutdown and power will need to be cycled to restore operation.

Ultra-Soft Turn-On
High power amplifiers draw a momentary, but tremendous in-rush of electrical current when you turn them on. This will not happen because of ATI’s Ultra Soft Turn-On circuitry.

Low Distortion/Low Noise
The exact “nature” of sound is a matter of individual choice and environmental conditions, however, distortion and noise are absolutely measurable in any situation. All ATI amps are at the “cutting edge” of the lowest distortion and noise possible.

Amplifier Topology
While there are numerous classes of amplifier design, the AT1820 Series amplifiers use the traditional Class AB topology.