Mark Levinson Nº 632 – Dual-Monaural Stereo Power Amplifier

Two Channels. One Extraordinary Amplifier.

The Mark Levinson Nº 632 brings the engineering philosophy of the new 600 Series to a reference-class stereo power amplifier. Combining fully discrete circuitry, dual-monaural architecture, and a substantial linear power supply, it is designed to reveal the full potential of a carefully assembled high-performance audio system.

At its heart is Mark Levinson's proprietary Pure Path circuit design. Its fully differential, fully balanced architecture is engineered to preserve musical detail while delivering the current and dynamic capability required by demanding loudspeakers.

Class A/AB operation, an ultra-low-noise toroidal transformer, and high-bias circuitry work together to provide precise control across the frequency range.

The Nº 632 also introduces Mark Levinson's striking Tectonic industrial design, with sculpted surfaces, glass elements, and signature red accent lighting.

For listeners seeking the performance and channel independence of dual-monaural amplification in a single chassis, the Nº 632 offers a sophisticated foundation for a reference stereo system.

 

Key Features

• Dual-Monaural Stereo Architecture: Independent left- and right-channel amplifier circuitry within one chassis.

• Pure Path Circuit Design: Mark Levinson's proprietary approach to high-performance analog amplification.

• Fully Discrete Signal Path: Individual components selected for precise circuit operation.

• Fully Balanced Architecture: Differential circuitry designed for signal integrity.

• Class A/AB Operation: High-bias amplification combines low-level refinement with substantial output capability.

• Ultra-Low-Noise Toroidal Transformer: Custom-designed and structurally isolated power transformer.

• Low-Feedback Design: Circuit architecture engineered for high inherent linearity.

• Balanced and Unbalanced Inputs: XLR and RCA connections for compatible preamplifiers.

• Hurricane Speaker Terminals: Two pairs of binding posts per channel for standard or compatible bi-wire connections.

• Tectonic Industrial Design: Premium chassis styling with signature red accent lighting.

• Custom Integration: 12V trigger input and output.

• American Engineering: Designed and engineered in the USA.

   

Pure Path: The Foundation of Mark Levinson Amplification

The Nº 632 is built around Mark Levinson's proprietary Pure Path circuit philosophy.

Its fully differential, fully discrete architecture employs a balanced signal path designed to preserve the integrity of the audio signal throughout the amplification process.

Rather than relying on extensive corrective feedback, the amplifier's circuitry is engineered for high inherent linearity.

This allows the design to use relatively little feedback while achieving low distortion and wide bandwidth.

High bias current further supports linear operation and the amplifier's ability to respond quickly to changes in the musical signal.

The objective is to preserve the character of the recording, from subtle instrumental textures to the full dynamic impact of a demanding performance.

 

Dual-Monaural Engineering in a Single Chassis

A serious stereo amplifier must reproduce two independent audio channels without compromising either one.

The Nº 632 employs a dual-monaural architecture, providing dedicated amplification circuitry for the left and right channels within a single enclosure.

This design supports channel separation while retaining the installation simplicity of one stereo power amplifier.

For listeners building a reference system around premium floorstanding loudspeakers, the Nº 632 provides a purpose-built approach to stereo amplification.

Its architecture is intended to reproduce a spacious soundstage, precise image placement, and the dynamic contrasts contained in the original recording.

Class A/AB: Refinement Meets Dynamic Capability

The Nº 632 uses Class A/AB amplification with unusually high bias current.

High-bias operation is intended to improve linearity and reduce crossover-related distortion while allowing the amplifier to deliver substantial output when the music demands it.

The circuit is also designed for wide bandwidth and rapid voltage changes, helping it respond to demanding musical transients.

From intimate acoustic recordings to large-scale orchestral music, the Nº 632 is engineered to maintain control and preserve musical detail across changing listening levels.

 

A Power Supply Built Around Musical Dynamics

The power supply is fundamental to the performance of any high-current amplifier.

The Nº 632 incorporates a custom-designed, ultra-low-noise toroidal transformer positioned centrally within the chassis.

The transformer is structurally isolated to help reduce the transmission of mechanical vibration to the amplifier's sensitive circuitry.

Its linear power-supply architecture is designed to provide the energy required for demanding loudspeaker loads and dynamic musical passages.

Combined with the amplifier's high-bias Pure Path circuitry, this provides the electrical foundation for controlled, responsive amplification.

 

Balanced and Unbalanced Connectivity

The Nº 632 provides both balanced XLR and single-ended RCA inputs for compatibility with a wide range of premium preamplifiers.

Each channel includes its own XLR and RCA input, with a rear-panel switch allowing the installer to select the appropriate connection type.

For compatible systems, Mark Levinson recommends using balanced connections when possible.

This makes the Nº 632 a natural partner for the Nº 626 preamplifier while also allowing it to integrate with other high-performance analog preamplifiers.

The Nº 632 is a dedicated power amplifier. It requires an external preamplifier or another compatible source with appropriate volume control.

 

Hurricane Speaker Terminals: Built for Serious Connections

The Nº 632 includes four pairs of Mark Levinson Hurricane loudspeaker binding posts.

Each amplifier channel receives two pairs of terminals, allowing conventional speaker connections or compatible bi-wiring arrangements.

These substantial terminals are designed to provide secure connections for high-performance loudspeaker cables.

For reference systems using premium floorstanding speakers, the dual-terminal arrangement offers useful installation flexibility.

Tectonic Design: A New Expression of Mark Levinson

The Nº 632 introduces the distinctive visual language of the 600 Series.

Inspired by the power and beauty of geological formations, its Tectonic industrial design combines sculpted chassis surfaces with glass elements and signature red accent lighting.

The result is a component that looks as substantial as its engineering suggests.

A prominent circular top-panel element, deeply sculpted side heatsinks, and illuminated front-panel detailing create a contemporary interpretation of Mark Levinson's established design identity.

The rear-panel lighting switch allows the red accent illumination to be set to low, high, or off, giving owners control over its appearance in a dedicated listening room.

Designed for a Complete Reference System

The Nº 632 is designed to complement the Mark Levinson Nº 626 preamplifier.

Together, they form a separates-based system that combines the Nº 626's analog and digital source management with the Nº 632's dedicated stereo power amplification.

The Nº 632 can also be paired with other compatible preamplifiers, allowing listeners to select their preferred analog and digital source components.

For professionally installed systems, 12V trigger input and output connections allow compatible components to coordinate power operation.

A USB-A service connection supports maintenance and firmware-related functions.

Technical Specifications

Specifications follow Mark Levinson's official product page, specification sheet, and quick-start guide. Published materials reviewed do not establish a reliable rated wattage or net weight, so those figures have been intentionally omitted rather than estimated.

Experience the Mark Levinson Nº 632 at The Grid HiFi

A reference power amplifier deserves an equally capable preamplifier, source components, and loudspeakers.

At The Grid HiFi, we specialize in high-performance two-channel audio, premium loudspeaker matching, reference amplification, and professional system installation.

Whether you're building a complete Mark Levinson 600 Series system, upgrading an existing amplifier, or designing a dedicated listening room, our team can help you select the right components and configure the system for your space.

Contact The Grid HiFi to discuss the Mark Levinson Nº 632 and build your next reference audio system.