Current Feedback Balanced Class AB topology
Dual DC Servos
Dual-Differential Gain Stage

300W per channel
16 output devices per channel
59,400uF power supply capacitance per channel
5RU rack mount

ATI AT6000 Signature Series

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.

Current Feedback Balanced Class AB topology
Dual DC Servos
Dual-Differential Gain Stage

300W per channel
16 output devices per channel
59,400uF power supply capacitance per channel
5RU rack mount

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.

Specifications

Audio

Numbers of Channels
2 to 7

Full Bandwidth Power Output into 8Ω (FTC)
300WRMS

Full Bandwidth Power Output into 4Ω (FTC)
450WRMS

Frequency Response:
±0.ldB 20Hz – 20kHz

Power Bandwidth (FTC)
+0,-3 dB 5Hz – 100kHz

Phase Response:
+5 to -15°, 20Hz – 20kHz @ 1W

Input Sensitivity for Full Rated FTC Output Power – 8Ω:
2 Volts

Signal-to-Noise Ratio (Ref FTC Rated Power, A-Wtd):
>125dB

Total Harmonic Distortion + Noise (20Hz – 20kHz):
<0.03%

Intermodulation Distortion:
<0.03%

Recommended Load Impedance:
Safe for all types of loads. Rated for 4Ω to 16Ω

Damping Factor:
>400

Crosstalk:
Greater than –80 dB from 20 Hz to 20 kHz

Gain
28dB ±0.2dB

Slew Rate:
>60V/µS

Input Impedance:
28kΩ

Output DC Offset
Less Than ±1mV

Physical

Chassis Dimensions (W x H x D) mm:
440 X 5RU X 502mm

Shipping Weight (kg):
AT6002: 49
AT6003: 54
AT6004: 59
AT6005: 65
AT6006: 70
AT6007: 75

Electrical

Power Requirements
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

Power Consumption (Standby)
≤1W (120 VAC), ≤0.5W (240 VAC)

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
46,200 µF (microfarads) per channel

Power Cord
Dual detachable, 3-wire cord.

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