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ATI Amplifier Technologies - AT 6000 - Class AB Power Amplifier

ATI Amplifier Technologies Inc.

ATI Amplifier Technologies - AT 6000 Series - Class AB Power Amplifier 


The 6000 series amplifiers, available with 2 to 7 channels, are the company’s flagship power amplifiers for over a decade. Furthermore, their “signature series” designation with a facsimile of Kessler’s signature on the main panel acknowledges the special nature of these designs.

Beyond Kessler’s personal identification, these amplifiers are new in more significant ways.

1. As in Kessler’s previous top-of-the-line designs, these amplifiers are fully balanced, differential amps, but unlike his earlier balanced designs which were essentially balanced bridged amplifiers, the 6000 series uses only a single input stage with dual-differential output stages. The reason: the advantages of balanced designs are retained and noise is reduced by 50%.

2. The design uses current feedback instead of the more common voltage feedback. The reason: current feedback amplifiers are faster with virtually unlimited slew rate and are better able to reproduce today’s best music and film sound.

3. Kessler used Thermaltrak output devices for the 6000 series. Unlike traditional designs where external diodes or transistors attached to the heat sinks track the amplifiers operating conditions and use the details to adjust bias, Thermaltrak devices have the temperature sensing device in the same package as the output transistor. The results: bias is optimized in real-time.

4. The 6000 series use dual DC servos to track and maintain DC offset. The result: DC in the amplifier’s output is reduced to insignificant levels.

ATI AT600 Review

"ATI is a well-known and regarded amplifier manufacturer building amps under their own brand and for other manufacturers that include Lexicon, Outlaw, SAE, and most recently Monoprice...

...The ATI AT6000 series amplifier performance is as massive as its dimensions and weight; and yet, completely silent -- delicate enough to deliver the softest passages and explosive enough for the loudest."

Read the Full Review Here
Rich B., March 09, 2018 19:00

Audioholics Online A/V Magazine

5. These amplifiers use a revised PCB layout. They are still modular with the complete amplifier including the power supply parts on a single card, but now the AC components are on one edge of the board and away from the signal input. The result: improved signal-to-noise performance.

6. All of the amplifiers in the series use dual toroidal transformers, dual power switches and dual line cords. The results: the AT6002 is now a complete dual-mono design and the amplifiers with many channels, as in the 7-channel AT6007, can be hooked-up to two independent 20 amp circuits for greater sustained output power than is possible from a single AC circuit.

All the amplifiers in the 6000 series are rated at 300 Watts RMS from 20 Hz to 20 kHz with no more that 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 128 dB referenced to full output so each amplifier in the series is capable of playing back the full dynamic range available on today’s lossless recordings.

Ceramic-tungsten technology

AC Power Connector
The AC input connector provides power to the unit with the supplied power cords. The 120VAC version of the 6000 series amplifiers is supplied with two 15 Amp power cords with standard NEMA-5-15P plugs on one end. The 230VAC versions are supplied with Schuko IEC 60320 with C19 plug. Some 230VAC versions are supplied with a different plug. 

Both power cords for at AT6002, AT6003 and AT6004 may be plugged into a single 15 Amp circuit (120VAC) OR 8 Amp (230VAC). Each power cord for the AT6005, AT6006, and AT6007 must be plugged into separate 15 Amp circuits (120VAC) or 8 Amp circuits (230VAC). Separate circuits typically are connected to different circuit breakers at the service entrance of the building.

Please contact us if you wish to order two different length power cables to accommodate a setup using two circuits.

Note: We can only ship to addresses within the USA. Visit for a list of International Dealers.

ATI Amplifier Technologies Inc.


Remote Trigger
         Activated from 3.3VDC to 24 VDC via a heavy-duty relay

Protection Circuits
         Optically - coupled with full automatic reset.

         Bottom Panel Ventilation

Toroid Transformers
         40% more efficient than EI type. Separate bi-filar windings for each channel guaranty lower noise and cross-talk.

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 with active bias circuits result in effortless operation.

Power Supply Capacitance
         59,400 mfd per channel.

Power Cord
         Dual detachable, 3-wire power cord. Included.

7-Year Warranty
         Parts and labor against defects in parts or workmanship.

         17 1/4"W X 9 1/2"H X 18 1/2"D (without feet: H=8 3/4")

         88 to 138 lbs (model dependent)



Number of Channels
        2 to 7

EIA 1kHz Output Power at 8 Ohms*
         350 Watts

EIA 1kHz Output Power at 4 Ohms*
         450 Watts

FTC Full Bandwidth Output Power at 8 Ohms**
         300 Watts

FTC Full Bandwidth Output Power at 4 Ohms**
         450 Watts

Input Sensitivity for Full Rated Power
         1.95 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 128dB below rated FTC Full Bandwidth Output

Total Harmonic Distortion (THD)
        Less than 0.05% at full rated FTC power; Less than 0.01% at full EIA power at 1kHz

Inter-modulation Distortion (IMD)
         Less than 0.05% at full rated FTC power; Less than 0.01% at full EIA power at 1kHz

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

Power Bandwidth FTC
        +0, -3 db from 5 Hz to 80 kHz

Damping Factor
        Greater than 400 from 10 Hz to 400 Hz

        Greater than –80 dB from 20 Hz to 20 kHz

        Voltage gain of 28dB ±0.2 dB

Slew Rate
        >60 V/µs

Input Impedance
        Nominally 50 kΩ

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

DC Output Offset
        Less than ±5 mV

Power Requirements
         120 VAC (other voltages available on export models)

Chassis Dimensions (H x W x D) Inches
         9½ x 17¼ x 18½ (Without feet: H = 8¾)

Net Weight (lbs/kg) Model Dependent
         86 to 136.4 / 39 to 62

Shipping Weight (lbs/kg) Model Dependent
         96 to 146.4 / 43.6 to 65.5

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