ATI Amplifier Technologies AT4003

ATi AT4003: Raw Power in Service of Sonic Excellence

The ATi AT4003 is a power amplifier that makes no compromises when it comes to delivering real power to your speakers. With 200 W per channel into 8 Ω and up to 300 W per channel into 4 Ω in class AB, this amp can efficiently drive any speakers, regardless of their power requirements. Whether you’re a music enthusiast or a home theater aficionado, the ATi AT4003 is ready to bring your favorite recordings to life with exceptional clarity and fidelity.

High-End Design Made in the USA

ATi stands out for its commitment to producing high-quality amplifiers, and the AT4003 is no exception. Every step of the design, manufacturing, and assembly of this amp is carried out at ATi’s factory in Los Angeles, California. This ensures a genuine “made in USA” product that meets the highest standards of quality and performance.

Balanced Design for Optimal Sonic Experience

The ATi AT4003 uses a fully balanced class A/B design, allowing it to provide separate power supplies for each channel. By utilizing two toroidal transformers and independent secondary windings, this amplifier offers a power supply capacity of 46,200uF per channel. This balanced design helps reduce interference and distortion, ensuring accurate and detailed sound reproduction.

ATi’s Signature Series: An Innovative Design Approach

The ATi AT4003 is part of ATi’s Signature Series, which pushes the boundaries of audio performance. This series uses a balanced circuit configuration with a single input stage and bi-differential output stages. This innovative approach reduces noise by 50% while retaining the benefits of balanced designs. The Signature Series amplifiers respond faster thanks to the use of current feedback, providing virtually unlimited slew rate. This feature allows these amplifiers to faithfully reproduce the most demanding musical and cinematic recordings.

Optimized Performance with ThermalTrak Technology

The Signature Series amplifiers, including the ATi AT4003, incorporate ThermalTrak output devices. This technology enables real-time temperature sensing with the output transistor, providing optimal bias performance. Combined with dual DC servos, this technology reduces DC offset at the output to insignificant levels. You can enjoy exceptional audio quality without worrying about unwanted distortion.

Specifications that Meet Your Expectations

The amplifiers in ATi’s AT4000 range are designed to meet the most demanding expectations of audiophiles. With a rated power of 200 W RMS from 20 Hz to 20 kHz and a maximum THD of 0.03% under 8 ohms, these amplifiers deliver faithful and accurate sound reproduction. Moreover, they are capable of providing 300 W RMS into 4 Ω under the same conditions. The Signature series amplifiers also comply with the FTC measurement standard, with a signal-to-noise ratio of - 126 dB at full power. This allows you to fully enjoy the dynamics and details of today’s high-definition recordings.

Quality guaranteed by a rigorous testing process

ATi places great importance on the quality and durability of its amplifiers. Each ATI amplifier undergoes a unique and rigorous testing procedure, ensuring it will last for many years with minimal maintenance. This procedure includes a thorough visual inspection, performance tests, evaluation of features and parameters, as well as a “torture” phase to detect any potential component failures. Finally, each amplifier undergoes critical listening and a final functional test to ensure compliance with the strictest quality standards.

Connectivity and ease of use

The ATi AT4003 offers comprehensive connectivity to meet your audio needs. On the rear of the amplifier, you’ll find an unbalanced RCA input and a balanced XLR input, allowing you to easily connect your favorite audio sources. Additionally, it features a convenient input selection switch and a pair of gold-plated speaker outputs for each channel. To facilitate integration with your system, this amplifier also has a trigger for automatic power-on when paired with a preamplifier, as well as a power socket for a detachable power cord.

Technical Specifications

Audio Performance

• Output Power (FTC)
  • 200 W RMS at 8 Ω
  • 300 W RMS at 4 Ω
• Frequency Response: ± 0.1 dB from 20 Hz to 20 kHz
• FTC Bandwidth: +0, -3 dB from 5 Hz to 100 kHz
• Phase Response: +5° to -15°, 20 Hz - 20 kHz at 1 W
• Signal-to-Noise Ratio: > 125 dB (Nominal Power ref. FTC, A-weighted)
• Total Harmonic Distortion + Noise: < 0.03% (20 Hz - 20 kHz)
• Intermodulation Distortion: < 0.03%
• Crosstalk: Greater than -80 dB from 20 Hz to 20 kHz
• Damping Factor: > 400

Electrical Specifications

• 3-channel power amplifier
• Input Sensitivity: 1.6 V (for full FTC power - 8 Ω)
• Voltage Gain
  • RCA Inputs: 28 dB ± 0.2 dB
  • XLR Inputs: 28 dB ± 0.2 dB
• Slew Rate: > 60 V/µs
• Input Impedance: 28 kΩ
• Recommended Load Impedance: 4 Ω to 16 Ω
• DC Output Voltage: Less than ±1 mV

Connectivity

• 3 unbalanced RCA inputs
• 3 balanced XLR inputs
• 1 input selector
• 1 pair of gold-plated speaker terminals (per channel)
• 1 trigger input for automatic power-on via preamplifier
• 1 gold-plated ground terminal
• 1 IEC power socket for detachable power cord

General Specifications

• Power Supply: 120 V AC or 240 V AC, 20 A circuit
• Standby Power Consumption: ≤ 0.5 W (240 V AC)
• Dimensions (W × H × D): 440 × 197 × 457 mm
• Net Weight: 32.2 kg
• Weight with Packaging: 39 kg
• Available with standard front panel or rack-mount version (to be specified when ordering)