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All ATI amplifiers are fully designed and assembled in the USA. ATI Signature Series are our very best amplifiers. Musical and powerful, ATI Signature Series is transparently revealing.


Amplifier Technologies, Inc., the prolific manufacturer of many of the high end’s best amplifiers offers a series of amplifiers designed by President and Chief Engineer, Morris Kessler. The AT6000 series amplifiers, available with 2 to 7 channels, remain as the company’s finest, musical amps since their introduction. Furthermore, their “Signature Series” designation with a facsimile of Kessler’s signature on the main panel acknowledges the special nature of these designs.

Power Cord
Dual detachable, 3-wire cord.
7-Year Warranty
Parts and labor against defects in parts or workmanship.

5RU 8.75” (222mm) Rack Mount
9.75” (248mm) Standard Height

Shipping Weight
107 to 165 lbs (model dependent)

ATI Signature Series are fully balanced, differential amps, advanced from previous designs which were essentially balanced bridged amplifiers. Signature Series uses only a single input stage with dual-differential output stages. This design approach retains the advantages of balanced designs and reduces noise by 50%. Using current feedback rather than voltage feedback, Signature Series amps respond faster with a virtually unlimited slew rate which makes them capable to reproduce todays best music and film sound. ThermalTrak™ output devices are incorporated in Signature Series amps to provide an integrated device for temperature sensing with the output transistor resulting in real-time bias performance. Combining these advancements with dual DC servos reduces DC offset at the output to insignificant levels.


The use of a modular PCB layout with amplifier and power supply parts on the same card with edge to edge isolation of AC and signal input provides improved signal-to-noise ratio. Dual toroidal transformers, dual power switches and dual AC power cords bring a complete dual-mono design to the AT6002 and AT4002. Multi-channel amplifiers up to the 7-channel AT6007 and AT4007 models may be connected to independent 20 amp circuits for greater sustained output power than would be possible than from a single AC circuit.

6000 Series amps are rated at 300 Watts RMS from 20Hz to 20kHz with no more than 0.03% THD at 8 ohms with all channels driven and 450 Watts RMS at 4 ohms under the same conditions. Signal-to-noise ratio is typically -128dB referenced to full output so that each Signature Series amp is capable of playing back the full dynamic range available on today’s lossless recordings.

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 and ThermalTrak™ output transistors insure optimized performance in real-time.
Power Supply Capacitance
59,400 µF (microfarads) per channel.
Power Cord
Dual detachable, 3-wire 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
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)
Chassis Dimensions (W x H x D) inches
Chassis Dimensions (W x H x D) millimeters
Net Weight (lbs/kg)
Shipping Weight (lbs/kg)
2.0 Volts
±0.ldB 20Hz - 20kH
+5 to -15°, 20Hz - 20kHz @ 1W
Safe for all types of loads. Rated for 4Ω to 16Ω
+0,-3 dB 5Hz - 100kHz
Greater than –80 dB from 20 Hz to 20 kHz
28dB ±0.2dB
28dB ±0.2dB
Less Than ±1mV
AT6002-AT6004: Factory built for single voltage - 120 VAC or 240VAC
2x 15 Amp Circuits
AT6005-AT6007: Factory built for single voltage - 120 VAC or 240VAC
2x 20 Amp Circuits
≤1W (120 VAC), ≤0.5W (240 VAC)
AT6002: 65W ± 5W
AT6003: 85W ± 5W
AT6004: TBD
AT6005: TBD
AT6006: TBD
AT6007: 175W ± 10W
17.0" X 9.5" X 19.75"
440 X 241 X 502
AT6002: 86/39.0
AT6003: 96/43.5
AT6004: TBD
AT6005: 121/54.9
AT6006: TBD
AT6007: 140/63.5
AT6002: 107/49
AT6003: 119/54
AT6004: 130/59
AT6005: 142/65
AT6006: 153/70
AT6007: 166/75
TitleDescriptionVersionSizeHitsDate addedDownload
AT6000, Standard Front, Line Drawing AT6000 Dimensioned Line Drawing1.94 MB128106-29-2021 DownloadPreview
AT6000 Manual AT6000 Manual4.26 MB260702-14-2020 DownloadPreview