B.M.C. CS2 Stereo Amplifier

B.M.C.'s CS2 is a Load-Effect Free (LEF) Amplifier with an option to upgrade it to a 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.

LEF = Load Effect Free

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.

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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, a 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.

 

CS2-Rear

More About the CS2

Outstanding Special Features of the B.M.C. Amplifier

The human sense of hearing is surprisingly unimpressed by the perfect test results of customary measuring methods. This is why traditional transistor amplifiers come under fire again and again, although tube amplifiers are not real alternative as they have clearly audible characteristics.
Several innovations were needed to build an amplifier that does not impose its own sound on the music. These innovations go way beyond the standard circuits and may be not easily understood, even by technologists.

Current Injection (CI), Discrete Intelligent Gain Management (DIGM), and Load-Effect Free (LEF) circuits are our own, original designs. Used together and consistently executed, they lead listeners into a new world of tonal experience.

Current Injection

Low impedance current input lets the original current of a signal source flow through the amplifier circuit until the desired loudspeaker output voltage is attained.

Discrete Intelligent Gain Management

Precise alignment of the amplifier to the desired volume occurs only on the level of the output voltage. This avoids unnecessary input signal attenuation, as well as excessive amplification.
Less amplification = less distortion and noise, which in turn = more natural musical quality.

Load Effect Free

The LEF output stage takes over the task of adapting the output voltage to the load (the loudspeaker). The signal transistor responsible for the sound is freed from driving the load to avoid distortions at the beginning. LEF makes it possible to use single-ended mode for high power, a mode that exceeds the classic Class-A by its natural lack of distortion.

Overall Negative Feedback is Obsolete

The B.M.C. amplifier's natural lack of distortion facilitates the intended renunciation of tonally suspect overall negative feedback.
The Current Injection input and Discrete Intelligent Gain Management would not be possible without the distortion-free LEF output stage and the absent negative feedback loop it induces.

Stabilized 2kW Power Supply

The power supply has nothing to do with the actual amplifier circuit, but determines the extent to which the potential of the amplifier really comes into effect.
A 2kW toroidal core transformer forms the solid basis for a very powerful, dynamic, and stable source of energy.
The storage in a whole battery of specially designed and produced Balanced Current capacitors is the basis for an exceptional musical evolvement and transparency.
An innovative electronic stabilization circuit especially for the power section filters mains voltage ripples and other disturbances out of the supply voltage, ensuring exceptional tranquility and dynamic stability.

All About the Music

The consequences of designing an amplifier for consistent, exceptional musical reproduction also lead to test results right out of the textbooks. But the essential thing is the musical experience. The expression "neutral amplifier" makes one think of an amplifier without a character of its own. But it's this lack of characteristics that makes describing the B.M.C. amplifier so difficult, since it can sometimes be brutally dynamic, sometimes highly expressive and full of detail, sometimes raw and discordant, sometimes bewitching and seductively beautiful, detailed and enveloped by its spatial presentation.
In the end, the result is a musical transparency that has never before been heard.

"More of the music and less of everything else."
- Mark Mickelson, Editor, The Audio Beat -

 

CS2-Inside