Select Page


All ATI amplifiers are fully designed and assembled in the USA. ATI Class AB amplifiers are powerfully stable with a straightforward design for performance and value.


Amplifier Technologies AT1820 Series amplifiers meet the needs of home audio systems from two channel to home theater. Simple and straightforward in design, the ATI AT1820 series offers models from 2 to 7 channels per chassis. AT1820 Series amps deliver 200 watts per channel to 8 ohms and 300 watts per channel to 4 ohms and offer tremendous value, performance, and reliability.

3-Wire Power Cord
7-Year Warranty
Parts and labor against defects in parts or workmanship.

4RU 7.00” (178mm) Rack Mount
7.75” (197mm) Standard Height

Shipping Weight
51 to 107 lbs (model dependent)

Beginning with the the two-channel AT1822 to the seven-channel AT1827, all AT1820 Series amplifiers feature ATI’s Soft Turn-on protection. The Soft Turn-on circuit gradually powers up the amp to avoid tripping the circuit breaker or dimming the lights. At the back of the amplifier, an RCA unbalanced input, an XLR Balanced input, input selection switch and a pair of gold-plated, 5-way binding post outputs support each channel. There is also a 1/8” mono mini jack for +12V trigger, a gold-plated chassis ground lug, a fuse holder and an IEC 20 Amp inlet for the provided detachable power cord. The supplied power cord will have either: a NEMA 5-15 plug (Type B) for use in the USA, a BS 1363 (Type G) plug for use in the UK, or a Schuko (Type F) plug for use in the EU and the rest of the world.

AT1820 Series amps are passively cooled with large heat sinks for efficiency and low noise operation. Featuring toroidal transformers with bi-filar windings ensures low noise and crosstalk, hallmarks of all ATI amplifiers.

Remote Trigger
Activated from 3.3VDC to 24VDC
Protection Circuits
Optically – coupled with full automatic reset.
Toroid Transformers
40% more efficient than EI type. Separate bi-filar windings for each channel guarantee lower noise and crosstalk.
Circuit Boards
Double-sided FR-4 glass epoxy, computer-grade boards are assembled in California.
Soft Start Circuitry
Soft-start minimizes in-rush current. Multiple units can be turned on without tripping circuit breakers, eliminating the need for turn-on sequencing.
Power Transistors
High current, bi-polar output transistors ensure optimized performance in real time.
Power Supply Capacitance
22,400uF per channel.
Power Cord
Detachable, 3-wire power cord.
7-Year Warranty
Parts and labor against defects in parts or workmanship.
Numbers of Channels
FTC Full Bandwidth Power Output@ 8Ω (Watts RMS)
FTC Full Bandwidth Power Output@ 4Ω (Watts RMS)
Input Sensitivity for Full Rated FTC Output Power - 8Ω
1.6 Volts
Frequency Response
+0, -.5dB, 5Hz to 20kHz, load independent
Signal-to-Noise Ratio (Ref FTC Rated Power, A-Wtd)
>120dB (A-weighted - Ref. 8Ω FTC Power)
Total Harmonic Distortion + Noise (20Hz - 20kHz)
Intermodulation Distortion
Recommended Load Impedance
8Ω Nominal, Stable into 4Ω
Damping Factor
>400 from 10Hz to 400Hz
>-100dB from 20Hz to 20kHz
Voltage Gain (RCA Inputs)
28.5dB ±0.5dB
Voltage Gain (XLR Inputs)
27.5dB ±0.5dB
Slew Rate
> 50V / μS
Input Impedance
28 kΩ Nominal
Output DC Offset
Power Requirements
117V AC or 230V; 50/60 Hz
Power Consumption (Standby)
≤1W (120 VAC), ≤0.5W (240 VAC)
Power Consumption (Idle)
120VAC or 240VAC; 50/60 Hz
Chassis Dimensions (W x H x D) inches
AT1822-AT1824: 17.0" X 7 3/4" X 14 5/8"
AT1825-AT1827: 17.0" x 7 3/4" x 17 5/8"
Chassis Dimensions (W x H x D) mlllimeters
AT1822-AT1824: 432 x 196 X 372
AT1825-AT1827: 432 x 196 x 448
Net Weight (lbs/kg)
AT1827: 95.2/43.3
AT1826: N/A
AT1825: 77/35
AT1824: N/A
AT1823: 52.1/23.7
AT1822: 44.25/20.1
Shipping Weight (lbs/kg)
AT1827: 107/48.6
AT1826: N/A
AT1825: 92/41.8
AT1824: N/A
AT1823: 58/26.4
AT1822: 51/23.2
TitleDescriptionVersionSizeHitsDate addedDownload
AT1820 Manual AT1820 Manual1.04.83 MB98907-11-2021 DownloadPreview