BMC Stereo Amplifier CS2

B.M.C.'s CS2 is a Load-Effect Free (LEF) Amplifier with an option to upgrade it to an LEF Stereo Power Amplifier. The crucial secret of the CS2's sound is that it avoids distortion, instead of compensating for it through a negative feedback loop.

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The CS2 is a power amplifier without a preamplifier for a short, pure signal path. It features a Volume Control using our exclusive Discrete Intelligent Gain Management (DIGM) system, and an input selector. The lossless DIGM volume adjustment eliminates unnecessary signal attenuation at the input, as well as unnecessary high amplification.


Combining the CS2 with a B.M.C. Digital-to-Analog Converter (DAC) transforms it into a LEF stereo power amplifier that offers DIGM gain adjustment set by the DAC's volume control. In addition, B.M.C.'s balanced Current Injection (CI) input enhances the immediacy of reproduced music by processing the signal current of the source until it reaches the speaker's output voltage.


B.M.C.'s LEF output stage avoids distortion before it occurs by relieving the sound-critical LEF single-ended Class-A transistor of all duties other than providing perfect signal reproduction.


Unlike other amplifiers, an LEF amplifier handles a speaker's current demand separately from the voltage demand. The result is an unparalleled mastery of musical complexity that brings to startling life delicate details, rock-shaking power, high dynamics, sonic vitality, and accurate imaging — all on a three-dimensional soundstage.


Load-Effect Free amplification is a new experience that must be heard to be fully appreciated.


The CS2 also boasts solid output power: 2 x 200 watts into 8 ohms, and 2 x 350 watts into 4 ohms.


A fully regulated power supply with a 2kW toroidal transformer and balanced current capacitors provide the muscle behind the music.





Output Power

2 x 200 Watt / 8 ohm, 2 x 360 Watt / 4 Ohm

Frequency Response 20 Hz – 20 kHz, 1W


Bandwidth 1W / -3dB

2Hz – 180kHz

Signal/Noise at DIGM 57 (relative to Pmax)


Signal/Noise at DIGM 40 (relative to Pmax)

Signal/Noise at DIGM 40 (relative to 1W)103dB
THD+N at 1 Watt, 1 kHz0.01%
THD+N from 50mW to 50W, 1kHzUnder 0.02%
THD+D under 0.1%From 0.3mW to 150 Watt
Damping Factor (8 Ohm, 10W)250
Inputs2 x balanced XLR and 3 x unbalanced RCA
Input Impedance50kOhm to ground, 100kOhm differential at XLR
XLR-CI Impedance1.5kOhm to ground, 3kOhm differential at XLR-CI
Input SensitivityMax 750mV/RCA, 1.5V/XLR
Volume AdjustmentDIGM in 66 precise 1 dB increments
Speaker Output1 Stereo-Pair with gold plated binding posts
AC VoltageAC 100V, 115V or 230V, 50/60 Hz
Power Consumption75W – 800W
Dimensions Enclosure (W x D x H)435 x 405 x 138mm
Dimension incl. Legs, Knobs and Terminals435 x 405 x 150mm