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About the RB-991
The Rotel RB-991 is a solid-state stereo power amplifier designed to provide remarkably lucid sound quality with a power output of 200 watts per channel into 8 ohms and 300 watts per channel into 4 ohms. It features a high damping factor (>500) to precisely control speaker driver motion, ensuring detailed and neutral sound reproduction. The amplifier uses two massive power supplies with a custom-built toroidal transformer and individual rectifier arrays and capacitor banks for each channel. It supports switchable balanced (XLR) and unbalanced (RCA) inputs for flexible system integration. The RB-991 is built with high-quality components including Black Gate and Wima capacitors and military-grade resistors, manufactured in China under British/Japanese design. It has a frequency response of 10 Hz to 100 kHz, total harmonic distortion under 0.03%, and a signal-to-noise ratio of 120 dB. The amplifier weighs 16.7 kg and measures 440 x 127 x 385 mm. Originally
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