Amplifier Technologies have developed a powerful multi-channel amplifier capable of astounding performance for music and cinema experiences. The AT3300 Pure Balance Series amplifiers deliver 330 watts per channel at 8 ohms and are available from 2 to 8 channel models. Featuring toroidal transformers and differential output stages, the AT3300 Series utilize ATI’s hybrid cooling system to keep the amplifier safely operating under the most demanding conditions.






Clean, accurate musical qualities. A hallmark of ATI amplifiers.


Designed for high power with low distortion.
ATI Pure Balance Series are robust, differential design amplifiers incorporating substantial power supplies to ensure maximum power to all channels as listening and cinematic sound demands are placed upon the amplifier. The ATI Pure Balance Series amplifiers have been designed with ATI’s latest approach to our Class AB differential amplifier design. Massive toroidal power transformers supply 450VA to each channel of the AT3300 series amps to provide full power capability to all channels for the greatest sonic experience that your speaker system can deliver. By offering up to 330 watts to all channels, not only are the front main L-C-R speakers performing with power and dynamics, all surround and height channel speakers will be ready for astonishing instantaneous immersive sound effects and realism.
Employing a modular amplifier bank approach to output channels; AT3300 amps are designed for efficient and powerful performance up to 4 channels on a compact 13.5” depth chassis for models AT3302, AT3303 and AT3304. In these models, up to 4 channels may be located at one side of the amplifier’s internal chassis for cooling efficiency. When increased channel counts are required such as 5 to 8 channels, a second toroidal transformer is incorporated to power the additional modular amplifier bank for channels 5-8 as in models AT3305, AT3306, AT3307 and AT3308 on a 16.5” depth chassis.

With this efficient internal mechanical design, a cooling tower for all channels is achieved. A CPU and temperature controlled 140mm (5.5”) computer fan positioned at each amplifier bank ensures continuous and quiet airflow cooling.

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 insure optimized performance in real-time.
Power Supply Capacitance
32,800 µF (microfarads) per channel.
Power Cord
Single cord (2-4 Channels) Dual cord (5-8 Channels).
7-Year Warranty
Parts and labor against defects in parts or workmanship.
Number 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
Frequency Response
Phase Response
Signal-to-Noise Ratio (Ref FTC Rated Power, A-Wtd)
Total Harmonic Distortion + Noise (20Hz - 20kHz)
Intermodulation Distortion
Recommended Load Impedance
Power Bandwidth FTC
Damping Factor
Voltage Gain (RCA Inputs)
Voltage Gain (XLR Inputs)
Slew Rate
Input Impedance
Output DC Offset
Power Requirements
Power Consumption (Standby)
Power Consumption (Idle/Max)
Chassis Dimensions (W x H x D) inches
Chassis Dimensions (W x H x D) millimeters
Net Weight (lbs/kg)
2.01 Volts
+0,-0.5dB 20Hz - 20kHz
+5° to -15°, 20Hz - 20kHz @ 1W
Safe for all types of loads. Rated for 4Ω to 16Ω.
+0,-3 dB 20Hz - 40kHz
Adjacent Channels - Better than -80dB from 200Hz - 10kHz
Skipped Channels - Better than -90dB from 200Hz - 10kHz
Bank to Bank Channels - Better than -100dB from 200Hz - 10kHz
28.2dB ±0.2dB
28.2dB ±0.2dB
Less Than ±5mV
117V/120V AC or 230V/240V AC; 50/60 Hz Factory Configured
Two Channel Amplifier Bank: 50W / 1440W
Three Channel Amplifier Bank: 70W / 1800W
Four Channel Amplifier Bank: 90W / 2400W
AT3302 to AT3304: 17" x 9 3/4" x 14 5/8"
AT3305 to AT3308: 17" x 9 3/4" x 17 5/8"
AT3302 to AT3304: 432 x 248 x 372
AT3305 to AT3308: 432 x 248 x 448
AT3302: 47.6/26.7
AT3303: 54/24.5
AT3304: 61/27.7
AT3305: 80.6/36.7
AT3306: 87/39.6
AT3307: 94.0/42.7
AT3308: 101/45.9
TitleDescriptionVersionSizeHitsDate addedDownload
AT3300, 4Ch & 8Ch, Dimensioned Line Drawing 2.18 MB130611-17-2021 DownloadPreview
AT3300 Manual AT3300 Manual3.86 MB208711-02-2021 DownloadPreview