AT1822 (PZA)
2 to 7 Channels - 200 Watts/Channel
With 200 watts per channel, the AT1820 series offers the best price-performance ratio of any amplifier available. The AT1820 series consists of six amplifier models. The series begins with the two-channel AT1822 and ends with the seven-channel AT1827.
The AT1820 series amplifiers are passively cooled by large heat sinks. This feature can be especially important in small home theater systems that can't hide the equipment on a shelf or in a cabinet.
An optically coupled protection circuit automatically shuts off the amplifier in an overload situation, such as when someone accidentally cuts the amplifier. Once the protection circuit is activated, it periodically checks the conditions and automatically restores the output when the overload situation is resolved. Since the protection circuit is optically coupled to the audio circuit, there is no direct electrical connection for the protection circuit to affect sound quality. A magnetic circuit breaker provides further protection.
The AT1820 series amplifiers use the same transformer construction as the top-of-the-line AT6000 and AT4000 Signature Series amplifiers. The amplifiers also utilize double-sided glass-epoxy circuit boards and the same rugged, powder-coated chassis used in all of our products.
The AT1820 series amplifiers include ATI's Ultra Soft Turn-On circuit. This circuit gradually turns on the amplifier and won't trip your home's circuit breaker or dim your lights when you turn it on. The amplifiers also include a trigger input that allows you to turn the amplifier on and off remotely.
Characteristics:
Convection cooling with massive heat sinks
The AT1820 series uses large extruded heat sinks, one for each amplifier channel.
Huge toroidal transformers
The massive transformers used in ATI amplifiers employ high-quality silicon steel cores with bifilar windings. To reduce crosstalk through the transformer, each amplifier channel has its own set of transformer secondary 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 circuit
This safety feature instantly stops current flow at the amplifier output under three conditions: 1) an overcurrent/short circuit condition, 2) high-frequency oscillation, and 3) an overtemperature condition. If activated, this circuit will test the condition every 10 seconds and restore output when the problem is resolved. In the event of excessive DC offset on any channel, the amplifier will shut down, and a power reset will be necessary to restore operation.
Ultra-smooth ignition
High-power amplifiers draw a momentary but tremendous electrical current when you turn them on. This won't happen thanks to ATI's ultra-smooth turn-on circuit.
Low distortion/low noise
The exact "nature" of the sound is a matter of individual choice and ambient conditions; however, distortion and noise are absolutely measurable in any situation. All ATI amplifiers are at the forefront of the lowest possible distortion and noise.
Amplifier topology
While there are numerous classes of amplifier design, the AT1820 series amplifiers use traditional Class AB topology.