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The B&K Reference 200.5 S2 is a five-channel high power amplifier introduced in 2004, designed for use in all types of audio or audio/video systems. It features a Class A predriver stage and AB MOSFET power output stages, providing efficient, linear power delivery and protection from thermal overload. The amplifier delivers 200 watts per channel into 8 ohms and 375 watts per channel into 4 ohms, with a peak current of 75 amps and dynamic headroom of 1.2 dB. It offers a frequency response from 5 Hz to 45 kHz, total harmonic distortion of 0.09%, and a damping factor of 450 at 50 Hz. The unit includes balanced (XLR) and unbalanced (RCA) inputs, with input sensitivities of 2.8 volts and 1.4 volts respectively. It has a gain of 28 dB and input impedance of 33.2 kΩ. The amplifier is equipped with high-quality components such as 1% metal film resistors, computer grade electrolytic capacitors, and a high capacity toroidal transformer for clean power supply. It also features gold-plated connectors, five-way binding posts supporting up to 4 AWG wire, and control input/output for system integration. The amplifier weighs 74 lbs and measures 17" wide, 7.5" high, and 19.5" deep. It consumes up to 1830 watts at maximum power and 130 watts at idle. The Reference 200.5 S2 is hand assembled in Buffalo, NY, USA, and was sold with a 5-year factory warranty through authorized dealers. It is highly regarded for its detailed, transparent, and musical sound reproduction, suitable for demanding audiophile speakers and home theater systems.
Amplification power output and characteristics
Analog signal output specifications
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The A200x5's power @ 4ω is 300W against the Reference 200.5 S2's 375W, its signal-to-noise 106 dB against 95 dB, and its damping factor >500 against >400. Both share power @ 8ω (200W).
The HCA-1205A's power @ 8ω is 140W against the Reference 200.5 S2's 200W, its power @ 4ω 200W against 375W, its signal-to-noise 117 dB against 95 dB, and its damping factor >800 against >400.
The GFA-7805's power @ 8ω is 300W against the Reference 200.5 S2's 200W, its power @ 4ω 450W against 375W, its signal-to-noise 112 dB against 95 dB, and its damping factor >500 against >400.
The XPA-3 Gen3's power @ 8ω is 300W against the Reference 200.5 S2's 200W, its power @ 4ω 550W against 375W, its signal-to-noise 117 dB against 95 dB, and its damping factor >500 against >400.
Marantz MM7055
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