EX-DISPLAY PRODUCT: This is an ex-demo product previously on display in our Showroom.
Marantz SM11S1 Power Amplifier (AMP 1 of 2)

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Product Details

The new SM11S1 is powerful. Very powerful. That's because it takes as much as possible from the highly acclaimed Reference Series MA9S2. The result? A powerful, highly dynamic stereo main amplifier, offering an open, transparent, and precision sound.

As you would expect, this current feedback technique amplifier can easily handle demanding Loudspeakers. For extreme set-ups, the bridge mode (BTL mode) can convert the stereo amplifier SM11S1 to a 400 W mono amplifier. The two-stage circuit construction (voltage amplification first to increase audio signal, buffer amplification second to ensure high current delivery) guarantees an excellent signal to noise ratio and the full control of any speaker. Thanks to the adjustable gain factor the SM11S1 can also upgrade the PM11S1 integrated amplifier, creating an excellent bi-amp system set up. Switching on/off can be remote controlled via a DC trigger from SC11S1 or other sources. Prepare to be exhilarated to a scintillating audio experience with crystal clear transparency

? Stereo power amplifier in-current feedback technology

? Technologies derived from the Reference Series MA9S2

? Ultra stable power output of 2 x 100 Watts at 8 Ohms and 2 x 200 Watts at 4 Ohms rms

? In monaural mode ? Bridge Mode (BTL) ? up to 1 x 400 W at 8 Ohms

? Fast and accurate signal handling for signals up to 100 kHz and higher

? Audiophile 2-stage circuit concept with voltage and power buffer amplifier stages

? Instantaneous current delivery capability

? Gain factor selectable 17.5 dB / 23 dB / 29.5 dB ? can be used to upgrade PM11S1

? HDAM SA2: High speed amplifier module with new high precision Melf resistors

? High speed input buffers keeping the full integrity of the signal

? Customised ?Blue Cap" film capacitors used in SC7S2 and MA9S2

? Large Toroidal transformer with anti magnetic aluminium shield case

? Output level meter in low noise LCD technology ? 3 digit per channel

? Each one stereo balanced XLR and stereo unbalanced input

? Two pair low impedance WBT speaker terminals for bi-wiring

? Heavy, 5 mm thick, copper plated aluminium top lid and aluminium die-cast feet

? DC trigger for remote on/off switching



A BTL is a possibility to use two amplifiers as one monoraul amplifier. This configuration, in theory quadruples the output power delivery to the speaker and offers better control over it leading to a very control, dynamic and open music reproduction.


Copper Plated Diecast Chassis

A copper plated chassis provides the best shielding against noise or electromagnetic distortion radiating from other components in the equipment. It prevents this noise from being amplified together with the audio signal. And even more important, it gives equal low impedance ground level to every point of the chassis, keeping the ground potential as clean as possible.


Current Feedback

Current Feedback amplification is a well known, Marantz' original circuit technology. The Current Feedback amplifier technology fits perfectly with the high requirements set for Super Audio software providing wide-bandwidth, high-speed reproduction. The impedance at the Current Feedback point is limited resulting in a very low phase shift. Marantz receivers and amplifiers equipped with Current Feedback can keep the phase compensation via Negative FeedBack (NFB) to a minimum, resulting in high through-rate, excellent transient response and superb sonic transparency for the full bandwidth. Unlike conventional Voltage Feedback amplification, the Current Feedback amplification makes the power amplifier in-sensitive to difficult loudspeaker loads.



Marantz developed its own discrete circuit boards to replace standard IC's. These HDAM's consists of discrete surface mount components with short mirror image L/R signal paths. Those devices are doing exactly the same thing as the Op-Amps, but outperform the regular IC Op-amps dramatically in terms of the Slew Rate and reduced noise level, resulting in a much more dynamic, accurate and detailed sound. Over the years Marantz developed different types of the HDAM to improve quality and to fit to the special requirements of a product category like CD or amplifier.


Symmetrical Circuit Layout

To achieve the best possible sonic performance, signal paths need to be short, direct and mirror imaged. The construction of our circuitry provides improved stereo imaging by ensuring close to perfect symmetry between right and left channel layout.


Toroidal Transformer

Toroidal transformer has several advantages over a normal EI core transformer. It is very efficient and therefore delivers more power compared to the same size of an EI core transformer. In addition, due to its shape, the electromagnetic radiation and the mechanical vibration are extremely low all ending in a better sound quality.



Very high quality speaker terminals made by German speaker terminal specialist WBT who has over 20 years of experience in production of best sounding speaker terminals.

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