Mark levinson no 320 s brochure
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The Nº320S Preamplifier is a direct descendant of the critically acclaimed Nº32 Reference Preamplifier. The Nº320S features audio circuits, controls, architecture, and phono input option based on the Nº32. In fact, some audio circuits, such as the proprietary discrete volume attenua- tors, are identical to those found in the Nº32. The single-chassis design of the Nº320S achieves similar separation of audio circuit, control, and power supply sections as the dual-chassis Nº32. Inside the Nº320S, these sections are separated by physical layout as well as a steel shield box that protects against electrostatic and magnetic interference. Filtered AC power is routed outside audio circuit sections, providing audio circuits with the quiet, shielded environment essential for superior sound. Many high-performance audio components rely on clean, noise-free AC power to deliver maximum performance. Unfortunately, most AC power does not meet these standards. Common household appliances such as refrigerators, televi- sions, and computers often contaminate AC power lines with line noise, spikes, and other irregularities that make it difficult for high- performance audio circuits to reach their full potential. To compensate for this, the Nº320S offers a series of highly effective noise suppression and isolation technologies. AC power is filtered for noise as soon as it enters the chassis. The audio section and control section have completely independent power supplies, each with their own low-noise toroid transformers. The audio power transformer features a Faraday shield between the AC lineand the low voltage secondaries for improved isolation. The Nº320S employs two stages of active voltage regulation for the audio sections. A high-power stage absorbs line voltage and temper- ature variations, while a second high-performance stage provides local, high- speed, low-noise power for the audio section. Featuring an advanced dual-mono design, the Nº320S is endowed with remarkable channel separation and exceptional sonic imaging. Both audio channels use independent power supplies, communication circuits, and audio circuits. In addition, each channels audio circuits are located in a separate area of the chassis. This innovative design isolates each channel from the other, allowing the Nº320S to produce vividly rich, three-dimensional sonic images with stunning precision. For even greater channel isolation, the Nº320S deactivates unused inputs to prevent interference from associated components. When an input is deactivated, the Nº320S disconnects the input signal and ground connection, eliminating ground loop noise between the Nº320S and the associat- ed component. As a result, input signals pass through the Nº320S with exceptional freedom from interference due to other components. Two Mark Levinson-designed discrete volume attenuator modules control master volume level with unparalleled accuracy and sonic neutrality. Constructed with Arlon 25N circuit boards with local power supply regulation and bypass capaci- tors, these modules generate optimal power and isolation for even the most sensitive adjustments. Precision surface-mounted resistors accommodate adjustments in 1.0dB increments up to 23.0dB and 0.1dB increments above 23.0dB. Unlike other stereo preamplifiers, the Nº320S is designed to integrate with multi-channel surround sound processors – minus the drawback N o 320S PREAMPLIFIER
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of competing master volume level controls. A unique surround sound processor mode allows the Nº320S to set its master volume level control to unity gain, passing complete control to the surround sound processor. With no interference from the Nº320S, the surround sound processor can maintain the relative volume level of all chan- nels without distorting its carefully calibrated input and output levels. A modest connector complement includes three balanced (XLR) and four single-ended (RCA) input connectors. Single-ended input signals are converted to balanced signals upon entering the chassis, and processed as balanced signals there- after. During this conversion process, meticulously balanced circuits preserve all input signal information, passing it to the power ampli- fier without the limitations of more asymmetrical single-ended designs. The rear panel also includes separate main and record output connectors, as well as two Link communication ports that make it possible for the Nº320S to be included in Mark Levinson Link systems. A large front panel select knob provides quick selection of the desired input. When an input is selected, just press and hold the front panel or remote control setup button to open the corre-sponding Set Inputs menu, which can be used to select a custom name, optimize gain levels, set a master volume level offset, or assign record output connectors to individual inputs. Following in the footsteps of the Nº32, the Nº320S exceeds all reasonable expectations for a stereo preamplifier. Its flexible design, including seven configurable inputs, separate main and record outputs, and full surround sound proces- sor integration, allow it to accommodate a wide range of demands. Even more, several advanced technologies protect audio circuits for a superior sound sure to complement even the most sophis- ticated home entertainment systems. Highlights -7 configurable inputs -Separate main and record outputs -3 balanced (XLR) inputs -4 single-ended (RCA) inputs -Complete surround sound processor integration -Advanced dual-mono design -Maximum channel isolation -Independent power supplies for audio circuit and control sections, each with their own low- noise toroidal transformer -Effective noise suppression and isolation tech- nologies -AC power filtering -Two active voltage regulation stages -Faraday shield to separate AC power from low- voltage secondaries -Independent audio circuits, communication circuits, and power supplies for each channel -Two proprietary discrete volume attenuator modules -Deactivation of unused inputs to eliminate ground loop noise -Balanced conversion for single-ended input signals -Intuitive Set Inputs menu -Large front panel display -Two Mark Levinson Link communication ports -RS-232 communication port -Trigger output connector -IR input connector -Phono input option 320S shown with the steel shield box removed.