Introduction
AT1820 Series amplifiers are passively cooled by large heat sinks. This feature can be especially important in small home theater systems where the equipment cannot be hidden in a rack or cabinet.
An optically coupled protection circuit automatically shuts down the amplifier in an overload situation, such as when someone accidentally short circuits the amplifier. Once the protection circuit is enabled, it periodically monitors conditions and automatically restores the output signal when the overload condition is cleared. Since the protection circuit is optically coupled to the audio circuit, there is no direct electrical connection allowing the protection circuit to affect the 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 series amplifiers. It also uses double-sided glass-epoxy circuit boards and the same rugged, powder-coated chassis used in all their products. The AT1820 amplifiers are equipped with ATI’s Ultra Soft Turn-On circuit. This circuit ensures that the amplifier turns on gradually and that the circuit breaker does not trip and the lights do not go out when you turn on the amplifier. The amplifiers also have a trigger input that allows them to be turned on and off remotely.
Features
- Convection cooling with solid 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 use high-quality 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 be linked to control systems or processors so that they can be switched on and off remotely.
- Optical protection circuit. This safety device immediately stops power in the amplifier’s output under three conditions: 1) an overcurrent/short circuit condition, 2) high-frequency oscillation & 3) an over-temperature condition. If activated, this circuit will sample the condition every 10 seconds and restore the output when the problem is corrected.
- In case of excessive DC offset on a channel, the chassis shuts down and power must be restored to restore operation.
- Ultra-smooth turn-on. High-power amplifiers draw a brief – but huge – surge of power when you turn them on. Thanks to ATI’s Ultra Soft Turn-On circuitry, this does not happen.
- Low distortion/low noise. The exact “nature” of sound is a matter of individual choice and environmental factors, but distortion and noise are absolutely measurable in any situation.
- All ATI amplifiers are on the “cutting edge” of lowest possible distortion and noise.
Downloads
Technical specifications
- Number of Channels 2 to 7
- Output power (FTC – 8Ω/4Ω) 200 / 300 watts
- THD+N (FTC power – 8Ω/4Ω) < 0.03% / <0.075%
- Output power (EIA – 8Ω/4Ω) 250 / 375 watts
- THD+N (EIA – 8Ω/4Ω) < 0.005% / <0.015%
- Frequency range 20Hz – 20kHz ±0.1dB
- Amplification 28dB
- Input sensitivity 1.6 volts
- Input impedance 28kΩ (nominal)
- Load impedance rated for 4Ω to 16Ω
- Safe for all types of loads
- S/N Ratio (Ref. 8Ω FTC power) > 120dB (A-Way Weighted)
- Phase response (1W into 8Ω) +5° to -15° from 20Hz to 20kHz
- Power bandwidth (1W into 8Ω) +0, -3dB from 5Hz to 100kHz
- Damping factor > 400 from 10Hz – 400Hz
- Crosstalk > -100dB from 20Hz – 20kHz
- DC Output Offset < ± 10mV
- Slew rate > 50V / µS
- Remote trigger input 3.3 to 24 VDC – tip positive
- Chassis dimensions (W x D x H) Weight
5 to 7 Channels: 43.2 x 44.8 x 19.6 cm Weight 41.6 – 48.6 Kg
2 to 4 Channels: 43.2 x 37.2 x 19.6 cm Weight 23.2 – 26.4 Kg
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