ATI Amplifier Technologies AT4004

ATI AT4004 Power Amplifier: Unrivaled Power and Performance

One of the major strengths of the ATI AT4004 power amplifier is its ability to efficiently power any speakers. With a true power output of 200 W per channel into 8 Ω and capable of reaching up to 300 W per channel into 4 Ω in class AB, this amplifier offers sufficient power reserves to reproduce the most dynamic passages with exceptional clarity. Whether you’re listening to music or watching a movie, the ATI AT4004 power amplifier guarantees an immersive and captivating audio experience.

A Made in USA Product

ATI, the manufacturer of the AT4004 power amplifier, takes pride in designing, manufacturing, and assembling all of its amplifiers in its Los Angeles, California factory. This genuine made in USA product is synonymous with quality and reliability. ATI pays meticulous attention to every step of the manufacturing process to ensure optimal performance and exceptional durability. By choosing the ATI AT4004 power amplifier, you are opting for a high-end product that will meet all your audiophile expectations.

A Powerhouse

The ATI AT4004 power amplifier utilizes a fully balanced class A/B design, with two toroidal transformers and independent secondary windings to provide separate power supplies for each channel. This design ensures accurate and balanced sound reproduction while minimizing unwanted interference and distortion. With its power supply capacity of 46,200uF per channel, the ATI AT4004 power amplifier offers exceptional stability and remarkable dynamic response.

ATI’s Signature Series: A Mark of Quality

The ATI AT4004 power amplifier is part of ATI’s prestigious Signature series. The amplifiers in this series use a balanced circuit configuration with a single input stage and bi-differential output stages. This design approach preserves the benefits of balanced designs while reducing noise by half. By employing current feedback, the Signature series amplifiers offer faster response and virtually unlimited slew rate, making them capable of accurately reproducing the best musical and cinematic recordings of the moment.

Advanced Performance and Protection

The ATI AT4004 power amplifier incorporates ThermalTrak output devices that provide an integrated temperature sensing process with the output transistor. This technology enables real-time bias performance and reduces DC offset at the output to insignificant levels. Furthermore, the AT4000 series amplifiers are equipped with effective protection against overloads, DC faults, overvoltage, and overheating. You can use the ATI AT4004 power amplifier with peace of mind, knowing that it is designed to withstand the most demanding conditions.

Guaranteed Quality and Durability

At ATI, each amplifier undergoes a unique and rigorous testing procedure, ensuring its quality and long-term durability. First, all assembled printed circuit boards are thoroughly visually inspected and subjected to performance tests. Next, the printed circuit boards are installed in the amplifier and tested for every function and parameter. To ensure their reliability, ATI AT4004 amplifiers are placed on a “torture” rack that simulates extreme conditions to detect any component failures. Finally, each amplifier undergoes critical listening and a final functional test to guarantee optimal performance.

Versatile Connectivity and Sleek Design

The ATI AT4004 power amplifier offers comprehensive connectivity to meet all your needs. On the rear of the amplifier, you’ll find an unbalanced RCA input, a balanced XLR input, an input selector switch, and a pair of gold-plated speaker outputs for each channel. Additionally, the power amplifier is equipped with a trigger, allowing it to automatically turn on when triggered by your preamplifier. The minimalist front panel design, with its single power switch that illuminates once the startup process is complete, adds a touch of elegance to your audio system.

Technical Specifications

Audio Performance

• FTC Output Power (full bandwidth)
  • 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 (FTC rated power, A-weighted): > 125 dB
• Total Harmonic Distortion + Noise (20 Hz - 20 kHz): < 0.03%
• Intermodulation Distortion: < 0.03%
• Crosstalk: > 80 dB from 20 Hz to 20 kHz
• Damping Factor: > 400

Electrical Specifications

• 4-channel power amplifier
• Input Sensitivity for maximum FTC output power (8 Ω): 1.6 V
• 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: < ±1 mV

Connectivity

• 4 unbalanced inputs (RCA)
• 4 balanced inputs (XLR)
• 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 removable power socket (IEC)

General Specifications

• Power Supply: 120 V AC or 240 V AC, 20 A circuit
• Power Consumption
  • Standby: ≤ 0.5 W (240 V AC)
• Dimensions (W × H × D): 440 × 197 × 457 mm
• Net Weight: 34 kg
• Weight with Packaging: 41 kg

Specify when ordering: standard version or rack-mount version.