ATI AT1800 Series Power Amplifiers

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Product Description

AT1800 Series Power Amplifiers

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The AT1800 shares key hallmarks with its larger siblings, the AT2000 and AT3000’s. The AT1800 is available in 6 configurations from the AT1802 2-channel model to the AT1807 7-channel version. Power is conservatively rated at 180 Watts RMS/channel into 8 Ohms from 20Hz to 20kHz with no more than 0.03% THD and I.M. distortion. Each model comes equipped with two toroidal transformers, a detachable IEC power cord, optically coupled protection circuits, soft-start circuit and convection cooling eliminating the need for fans. Units can even be upgraded at the factory to add additional channels (up to 7).

Like all other ATI amplifiers, the AT1800-series amps are cooled by large heat sinks, not by cooling fans. This feature may be especially important in this amplifier, which is likely to find use in many home theater systems that do not hide the equipment in a rack or closet.

You can set this amp right next to your favorite listening chair without having to worry about fan noise. An optically-coupled protection circuit automatically shuts down the amplifier in an overload situation, such as when someone accidentally cuts into a speaker cable and shorts out the amp. Once the protection circuit is engaged, it checks the conditions every 10 seconds, and restores output automatically when the overload situation is remedied. The protection circuit is optically coupled to the audio circuit; because there’s no direct electrical connection, the protection doesn’t affect sound quality. A magnetic circuit breaker provides further protection and eliminates the need for cumbersome fuses.

The AT1800-series amps use the same transformer construction as the top-of-the-line AT3000 and AT2000 series amps: MOH cores with bifilar windings, built in our own factory. It also uses double-sided glass epoxy circuit boards and the same rugged, powder-coated chassis used in all our products.

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Even the AT1807, with 1,260 total watts, will not trip your household circuit breaker or dim the lights when you switch it on. High power amps draw a momentary—but tremendous— inrush of electrical current when you turn them on. The AT1800-series amps do not, thanks to ATI’s Ultra Soft Turn-On circuit. This circuit gradually powers up the amp, to ease the load on your household circuits. And the amp includes a trigger input that allows it to be turned on and off.

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Series AT1800

Number of Channels 2 to 7

EIA 1kHz Output Power at 8 Ohms* 210 watts

EIA 1kHz Output Power at 4 Ohms* 315 watts

FTC Full Bandwidth Output Power at 8 Ohms** 180 watts

FTC Full Bandwidth Output Power at 4 Ohms** 270 watts

Input Sensitivity for Full Rated Power 1.6 Volts

Frequency Response at Rated Output 20Hz to 20kHz ±0.1dB

Phase Response +5 to -15 degrees from 20Hz to 20kHz at 1 watt

Signal-to-Noise Ratio “A-Weighted” Greater than 120dB below rated FTC Full Bandwidth Power

Total Harmonic Distortion (THD) Less than 0.03% at full rated FTC power Less than 0.005% at full EIA power at 1kHz

Intermodulation Distortion (IMD) Less than 0.03% at full rated FTC power Less than 0.005% at full EIA power at 1kHz

Load Impedance Safe with all types of loads. Rated for 4 to 16 ohms

Power Bandwidth FTC +0-3db from 5Hz to 100kHz

Damping Factor Greater than 400 from 10Hz to 400Hz

Crosstalk Greater than –100dB from 20Hz to 20kHz

Gain Voltage gain of 28dB

Slew Rate 50V/microsecond

Input Impedance Nominally 28k ohms

Remote Trigger Voltage 3.3 to 24 Volts DC at 5 millamperes or greater

DC Output Offset Less than ±5mV

Power Requirements 220/240 VAC

Chassis Dimensions (W x H x D) Inches 17 x 7 x 16.5

Chassis Dimensions (W x H x D) Millimeters 431.8 x 177.8 x 419.1

Net Weight (lbs/kg) Model Dependent 50-93/22.73-42.27

Shipping Weight (lbs/kg) Model Dependent 62-105/28.79-48.75

*EIA 1kHz Power refers to maximum average power in watts at 1kHz with 0.005% THD and noise.

**FTC Full Bandwidth Power refers to maximum average power in watts from 20Hz to 20kHz with 0.03% THD and noise.

 

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