Audio Research D-400 Amplifier 200WPC - Orig Box + 2000W Transformer

Commanding, transparent, and built to an uncompromising standard, the Audio Research D-400 stands as one of the finest solid-state power amplifiers produced by the legendary Audio Research Corporation. Known for its sheer authority, exceptional staging, and rock-solid build quality, it is an ideal centerpiece for audiophiles looking to drive demanding speakers with effortless finesse.

• Important Note on Voltage: This is the original 100V version (as specified on the factory packaging). To make it ready for seamless plug-and-play use in standard 110V/120V North American environments, this sale includes the heavy-duty PowerBright VC-2000J 2000-Watt Step Up & Down Transformer shown in the photos. With 2000 watts of robust capacity, it provides more than enough headroom to safely run this high-current amplifier without breaking a sweat.

Performance & Specifications

• Power Output: Delivers 200 watts per channel into 8 ohms and 400 watts per channel into 4 ohms.

• Frequency Response: Wide response from 4 Hz to 100 kHz with a signal-to-noise ratio over 100 dB.

• Circuitry: Fully differential balanced circuit featuring both RCA and XLR inputs.

• Power Supply: Massive power supply equipped with 270,000 µF of filter capacitance for deep bass control and extraordinary dynamic headroom.

• Dimensions & Weight: Built like a tank, weighing approximately 76 lbs (~34.5 kg) and measuring roughly 19" W x 8.5" H x 17.5" D.

Condition

This unit is in excellent condition, functions perfectly, and includes the original factory box for safe shipping or long-term storage — a rare find for vintage high-end gear.

Cosmetically clean with minor wear consistent with age; no dents or damage. The front panel is pristine, and all rear connections are intact and solid. The unit has been carefully stored and lightly used in a smoke-free, climate-controlled environment.

Whether you're looking to upgrade your stereo system or build a powerful two-channel setup, the Audio Research D-400 delivers reference-grade performance that rivals much more expensive gear. It pairs beautifully with Audio Research preamps or any high-end analog or digital source.

Included in This Sale:

• Audio Research D-400 Stereo Power Amplifier (100V Model)

• PowerBright VC-2000J 2000-Watt Step Up & Down Transformer (Includes grounded plug and ready for standard US outlets)

• Original Factory Box

• Power Cable

Note: If you're comparing specs, be sure you're looking at the correct model — this listing reflects the standard D-400 (non-MKII) version paired with a dedicated, high-capacity voltage converter for hassle-free operation.