Cyber 845 S

About the Cyber 845 S

The Opera Consonance Cyber 845 S is a high-end monoblock tube amplifier designed for audiophiles seeking pure class A single-ended triode amplification. It is an improved version of the original 211 monoblocks, featuring a zero feedback design and a flat black finish. The amplifier uses 2 x 845 output tubes, 2 x 5687 driver tubes, 2 x E88CC input tubes, and 2 x 5AR4 rectifier tubes. It includes a face-mounted bias meter for easier monitoring and has a warm-up time of approximately 3 minutes. The Cyber 845 S delivers 28 watts RMS at 1kHz with less than 1% total harmonic distortion at 15 watts. It offers a frequency response from 5Hz to 47kHz (-3dB points at 15 watts), input sensitivity of 0.7V, and input impedance of 100k ohms. Output impedance is user-selectable between 4 and 8 ohms. Signal-to-noise ratio is 90dB. Power consumption is about 190 watts per amplifier. Dimensions are 390mm (H) x 190mm (W) x 500mm (D) and each amplifier weighs 35kg packed. The amplifier uses a single RCA input interface. It is highly regarded in the audiophile community for its sound quality and build, with positive reviews available from sources such as Positive Feedback magazine.