ATI AT4004 Signature Series Amplifier

15,435.00SAR

  • 4 Channel Power Amplifier
  • 200 watts RMS/channel
  • Class A/B
  • Made in USA

Out of stock

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Description

ATI  has introduced a new series of amplifiers designed by their president and chief engineer, Morris Kessler. The ATI AT4005 amp and the entire AT4000 Signature Series amplifiers, share the design philosophy and circuit sophistication of ATI’s award-winning 6000 Series amps with power output reduced to 200W RMS per channel at 8 ohms and 300 W RMS at 4 ohms. Furthermore, their “signature series” designation with a facsimile of Kessler’s signature on the main panel attests the special nature of these amplifiers.

The ATI AT 4005 amplifier and all the amplifiers in the AT4000 series are rated at 200 Watts RMS/channel into 8 ohms from 20Hz to 20kHz with no more than 0.03% THD with all channels driven and 300 Watts RMS at 4 ohms under the same conditions. The ATI AT 4005 amp has a signal-to-noise ratio that is typically 126 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.

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 4000 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 unlmited slew rate and are better able to reproduce today’s best music and film.
  3. Kessler used Thermaltrak output devices for the 4000 series. Unlike traditional designs where external diodes attached to the heat sinks track the amplifiers operating conditions and use the details to adjust bias, Thermaltrak devices have the diodes in the same package as the transistors. The results: bias is optimized in real-time.
  4. The 4000 series use dual DC servos to track and maintain DC offset. The result: DC in the amplifier’s output is reduced to insignificant levels.
  5. All of the amplifiers in the series use dual toroidal transformers with independent secondary windings. Electrically, each amplifier channel has its own transformer.

 

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 with active bias circuits result in effortless operation.

Thermaltrak Output Devices:

Thermaltrak devices have tracking diodes in the same package as the transistors so bias is optimized in real-time.

Power Cord:

Detachable, 3-wire cord.

Dimensions:

17.25″w X 7.875″h X 17″d (chassis). Handles protrude 1 3/4″ (44.5 mm); add 1 1/4″ (32 mm) for input/output jacks.

Weight:

86 to 136 lbs (model dependent)

Additional information

Weight 1 kg

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