Marantz MODEL 40n Network Integrated Amplifier

70 Wpc class-AB amplification with HDAM-SA3 circuitry, HEOS streaming, HDMI ARC, and Marantz Musical Phono EQ

The Marantz MODEL 40n combines high-performance two-channel amplification, high-resolution digital audio streaming, and extensive connectivity in a single integrated amplifier. Delivering 70 W per channel into 8 Ω and 100 W per channel into 4 Ω, the MODEL 40n offers the power and control needed to drive a wide range of loudspeakers while providing convenient access to both traditional and modern music sources.

Designed for listeners who want the performance of a dedicated hi-fi amplifier without requiring separate streaming components, the MODEL 40n brings together Marantz's decades of audio engineering experience and a distinctive contemporary design. With HEOS Built-in, Apple AirPlay 2, Bluetooth, Spotify Connect, HDMI ARC, and a dedicated MM phonostage, it can serve as the centerpiece of a complete music and entertainment system.

Discrete Class-AB Amplification

At the heart of the MODEL 40n is a fully discrete class-AB amplifier designed to deliver substantial power with low distortion. Its 70 W per channel output into 8 Ω increases to 100 W per channel into 4 Ω, providing the current delivery and headroom required for a variety of bookshelf and floorstanding loudspeakers.

The amplifier incorporates Marantz's proprietary Hyper Dynamic Amplifier Modules (HDAM), which use discrete components rather than conventional integrated-circuit operational amplifiers in critical signal stages. These circuits are designed to provide high slew rates and wide bandwidth, helping the amplifier respond accurately to rapidly changing musical signals.

The MODEL 40n uses HDAM-SA3 circuitry in its amplification stages, contributing to a specified total harmonic distortion of just 0.02% across the audible frequency range. A damping factor of 100 helps the amplifier maintain control over connected loudspeakers, particularly during demanding low-frequency passages.

Marantz's Sound Master tuning process further refines the amplifier's performance through careful component selection and extensive listening evaluations. The result is intended to deliver the company's characteristic combination of musical detail, tonal richness, and spacious imaging.

High-Resolution Music Streaming With HEOS

With HEOS Built-in, the MODEL 40n provides convenient access to music streaming services, internet radio, and locally stored digital music. The HEOS app allows listeners to browse music, select sources, adjust volume, and control playback from a smartphone or tablet.

Supported streaming services include Amazon Music, TIDAL, Spotify, Pandora, Deezer, iHeartRadio, TuneIn, and others, with availability varying by region. HEOS also provides access to music stored on compatible network-attached storage devices and computers connected to the same network.

For listeners with their own digital music libraries, the MODEL 40n supports high-resolution PCM playback up to 24-bit/192 kHz and DSD files at 2.8 MHz and 5.6 MHz. Supported formats include FLAC, ALAC, WAV, MP3, AAC, WMA, and DSD.

Apple AirPlay 2 makes it easy to stream directly from an iPhone, iPad, or Mac, while Bluetooth provides a convenient wireless connection for compatible devices. Spotify Connect offers direct control of Spotify playback from the Spotify app.

The rear-panel USB-A port provides another way to enjoy locally stored music without requiring a computer or network connection. The port supports compatible USB mass storage devices, allowing digital music files to be played through the amplifier's internal digital-to-analog conversion circuitry.

Multiroom Audio Made Simple

The MODEL 40n can also be part of a larger HEOS multiroom audio system. Connect additional HEOS-enabled Marantz or Denon components throughout the home, and use the HEOS app to play different music in different rooms or synchronize playback across multiple listening areas.

This allows the MODEL 40n to serve as the primary music system in a living room or dedicated listening space while other HEOS devices provide music in bedrooms, offices, kitchens, or secondary listening areas.

Each zone can be controlled independently, with separate source selection and volume adjustment. Alternatively, multiple HEOS devices can be grouped together for synchronized music playback throughout the home.

The MODEL 40n is also Roon Ready, providing another way to integrate the amplifier into a high-resolution music system managed through Roon.

Better TV Sound With HDMI ARC

The MODEL 40n is equally capable as the centerpiece of a television audio system. Its HDMI ARC connection allows audio from a compatible television to be reproduced through a pair of conventional stereo loudspeakers, providing an alternative to a soundbar without requiring a separate AV receiver.

The HDMI connection supports Audio Return Channel (ARC) operation, allowing compatible televisions to send stereo PCM audio to the amplifier through a single HDMI cable. This makes it easy to enjoy television broadcasts, movies, games, and streaming video through a dedicated hi-fi system.

The HDMI connection is intended for television audio rather than video switching or multichannel home theater decoding. Connected televisions should be configured to output compatible PCM audio.

HDMI-CEC support also allows compatible television remotes to control volume and power functions, simplifying everyday operation and making the MODEL 40n a practical choice for systems used for both music and television.

Marantz Musical Phono EQ

For vinyl enthusiasts, the MODEL 40n includes a dedicated moving-magnet phonostage incorporating Marantz Musical Phono EQ technology. This allows a turntable fitted with a compatible MM cartridge to connect directly to the amplifier without requiring a separate external phono preamplifier.

Marantz Musical Phono EQ uses a carefully engineered analog circuit designed to provide accurate RIAA equalization and preserve the low-level musical detail recovered from vinyl records. Its simplified signal path helps minimize unnecessary amplification stages and associated noise.

The phonostage has an input sensitivity of 2 mV and an input impedance of 47 kΩ, making it compatible with a broad range of conventional moving-magnet cartridges.

By incorporating a dedicated phonostage alongside network streaming and digital connectivity, the MODEL 40n accommodates both traditional analog listening and modern digital music sources.

High-Quality Digital Audio Conversion

In addition to network streaming, the MODEL 40n provides optical and coaxial digital inputs for compatible CD transports, televisions, and other digital audio sources. These inputs allow external components to take advantage of the amplifier's internal digital-to-analog conversion circuitry.

High-resolution digital playback provides access to recordings with greater bit depth and sampling rates than conventional CD audio, allowing compatible source material to be reproduced without the need for a separate DAC.

The digital section is integrated with the amplifier's carefully designed analog circuitry, allowing the MODEL 40n to provide a straightforward signal path from digital source to loudspeaker.

For listeners who prefer conventional analog sources, Source Direct mode bypasses the bass, treble, and balance adjustment circuitry to provide a more direct audio signal path.

Subwoofer Integration and Flexible Sound Adjustment

For systems requiring deeper bass, the MODEL 40n includes a dedicated subwoofer preamplifier output with selectable low-pass filtering. Available crossover settings include 40 Hz, 60 Hz, 80 Hz, 100 Hz, and 120 Hz, allowing the output to be tailored to the connected subwoofer and main loudspeakers.

This makes it possible to combine a pair of compact bookshelf speakers with a powered subwoofer or supplement the low-frequency performance of larger floorstanding speakers.

The amplifier also provides bass, treble, and balance adjustments, giving listeners flexibility when matching the MODEL 40n to different loudspeakers and listening rooms.

For systems where tone adjustment is unnecessary, Source Direct mode bypasses these controls, preserving a more direct signal path through the amplifier.

Power Amp Direct for System Expansion

The MODEL 40n includes a Power Amp Direct input that allows an external preamplifier or compatible AV processor to feed the amplifier's power stage directly. This bypasses the MODEL 40n's normal preamplifier and volume-control functions, allowing the unit to operate as a dedicated stereo power amplifier.

This feature is particularly useful for listeners who want to use the MODEL 40n as part of a larger home entertainment system while retaining the performance of its dedicated two-channel amplification.

For example, the front left and right preamplifier outputs of a compatible surround processor can be connected to the Power Amp Direct input, allowing the MODEL 40n to drive the main loudspeakers during home theater playback while functioning as a standalone integrated amplifier for two-channel music listening.

The amplifier also includes a conventional recorder output for connecting compatible analog recording equipment.

Double-Shielded Toroidal Power Supply

The MODEL 40n uses a double-shielded toroidal power transformer designed to provide stable power delivery while minimizing unwanted electrical and magnetic interference. Toroidal transformers are valued in high-performance audio components for their efficiency, compact form, and low external magnetic field.

The shielding helps reduce interference with nearby sensitive audio circuitry, while the power supply is designed to provide the current required for demanding musical passages.

Carefully selected components and an optimized internal layout contribute to the amplifier's low-noise performance. The chassis incorporates a reinforced double-layer bottom plate, providing additional mechanical rigidity and helping reduce the influence of unwanted vibration.

These refinements reflect Marantz's emphasis on the electrical and mechanical foundations of sound quality, rather than relying on amplification circuitry alone.

Luxurious Design and Everyday Operation

The MODEL 40n features Marantz's distinctive contemporary industrial design, combining a symmetrical front panel, a central porthole display, and carefully detailed controls. Its appearance draws on the company's long history of integrated amplifiers while presenting a modern interpretation of traditional hi-fi design.

The front center panel is made from aluminum, with matching aluminum knobs for volume, source selection, and tone adjustment. Subtle edge lighting accentuates the sculpted front panel and can be dimmed to suit the listening environment.

The amplifier is available in black and silver-gold finishes, allowing it to complement a range of audio components and interior styles.

A supplied system remote provides convenient control of the amplifier and compatible Marantz CD players, while the HEOS app provides access to streaming services, network music libraries, and multiroom operation.

Flexible Connectivity and Custom Installation

Along with its extensive wireless and network features, the MODEL 40n provides three conventional stereo RCA line inputs, a dedicated MM phono input, optical and coaxial digital inputs, HDMI ARC, and a rear-panel USB-A port for compatible storage devices.

Wired Ethernet and Wi-Fi provide flexible network connectivity, while Bluetooth and Apple AirPlay 2 accommodate direct wireless playback from compatible devices.

The amplifier also includes Marantz remote-control bus connections, allowing compatible Marantz components to be integrated into a coordinated system. Support for Control4 and Josh.ai provides additional options for custom home automation installations.

With its combination of traditional analog connectivity, high-resolution digital playback, network streaming, and Power Amp Direct functionality, the MODEL 40n is designed to accommodate a wide range of system configurations without requiring a collection of separate components.

A Complete High-Performance Music System

The MODEL 40n brings together the major elements of a serious two-channel audio system in a single chassis: discrete amplification, analog preamplification, a moving-magnet phonostage, digital-to-analog conversion, high-resolution network streaming, and extensive source connectivity.

Its 70 W per channel into 8 Ω, substantial power supply, and HDAM-SA3 circuitry make it suitable for driving a wide range of loudspeakers, while its HEOS streaming platform provides access to modern digital music services without the need for a separate network player.

For listeners who want the convenience of a modern connected amplifier without surrendering the sound quality, physical controls, and construction of traditional hi-fi, the MODEL 40n offers a carefully integrated approach to two-channel listening.

Features

• High-performance two-channel network integrated amplifier
• 70 W per channel into 8 Ω and 100 W per channel into 4 Ω
• Fully discrete class-AB amplification
• Proprietary Marantz HDAM-SA3 amplifier circuitry
• Marantz Sound Master tuning with carefully selected audio components
• Double-shielded toroidal power transformer
• Frequency response of 5 Hz–50 kHz
• Total harmonic distortion of 0.02% (20 Hz–20 kHz, 8 Ω)
• Damping factor of 100
• HEOS Built-in for high-resolution music streaming and multiroom audio
• Apple AirPlay 2, Bluetooth, and Spotify Connect
• Roon Ready compatibility
• High-resolution PCM playback up to 24-bit/192 kHz and DSD up to 5.6 MHz
• HDMI ARC for television audio playback through a stereo system
• HDMI-CEC support for compatible television remote controls
• Dedicated moving-magnet phonostage with Marantz Musical Phono EQ
• Optical and coaxial digital inputs
• Three stereo RCA line inputs
• Rear-panel USB-A input for compatible music storage devices
• Power Amp Direct input for use with an external preamplifier or AV processor
• Dedicated subwoofer output with selectable low-pass filtering
• Selectable subwoofer crossover settings of 40, 60, 80, 100, and 120 Hz
• Bass, treble, and balance adjustments
• Source Direct mode for a simplified analog signal path
• Recorder output for compatible analog recording equipment
• High-quality Marantz SPKT-1+ speaker terminals
• Dual-band Wi-Fi and wired Ethernet connectivity
• Marantz remote-control bus connections
• HEOS app control for music streaming and multiroom operation
• Control4 and Josh.ai integration support
• Reinforced chassis with double-layer bottom plate
• Aluminum front center panel and precision aluminum control knobs
• Distinctive Marantz porthole display
• Adjustable front-panel edge lighting
• Available in black and silver-gold finishes
• Detachable power cable and supplied system remote control
• Five-year manufacturer's limited warranty

What's Included

• Marantz MODEL 40n network integrated amplifier
• System remote control
• Batteries for remote control
• External wireless antennas
• AC power cord
• Quick start guide

Specifications

Type: Network integrated stereo amplifier

Amplifier Design: Discrete class-AB with Marantz HDAM-SA3 circuitry

Channels: 2.2

Powered Channels: 2

Power Output (8 Ω): 70 W per channel

Power Output (4 Ω): 100 W per channel

Power Amplifier Circuit: Marantz HDAM-SA3

Power Transformer: Double-shielded toroidal

Frequency Response: 5 Hz–50 kHz

Total Harmonic Distortion: 0.02% (20 Hz–20 kHz, 8 Ω)

Damping Factor: 100

Signal-to-Noise Ratio (Phono MM): 87 dB

Signal-to-Noise Ratio (CD): 106 dB

Phono Input: Moving magnet (MM), Marantz Musical Phono EQ

Phono Input Sensitivity/Impedance: 2 mV/47 kΩ

Line Input Sensitivity/Impedance: 220 mV/20 kΩ

Power Amp Direct Input Sensitivity/Impedance: 1.6 V/15 kΩ

Analog Inputs: 4 stereo RCA (phono, CD, line, recorder)

Power Amp Direct Input: Stereo RCA

Digital Inputs: 1 optical (TOSLINK), 1 coaxial

HDMI: 1 ARC input (stereo PCM audio)

USB: Rear-panel USB-A (mass storage class, 5 V/1 A)

Analog Outputs: Stereo RCA recorder output

Preamplifier Outputs: Not provided

Subwoofer Output: RCA with selectable low-pass filter

Subwoofer Low-Pass Filter: 40, 60, 80, 100, 120 Hz

Speaker Terminals: Marantz SPKT-1+

Supported Audio Formats: FLAC, ALAC, WAV, MP3, AAC, WMA, DSD

PCM Resolution: Up to 24-bit/192 kHz

DSD Support: 2.8 MHz, 5.6 MHz

Streaming: HEOS Built-in, Apple AirPlay 2, Bluetooth, Spotify Connect, internet radio

Roon Compatibility: Roon Ready

Wireless Networking: Dual-band Wi-Fi

Wired Networking: Ethernet

Tone Controls: Bass, treble, balance

Listening Modes: Stereo, Source Direct

Volume Control: Electronic

Remote Control: Marantz system remote with amplifier and compatible CD player control

Remote-Control Bus: Marantz RC-5 input and output

App Control: HEOS

Custom Installation Compatibility: Control4, Josh.ai

Front Center Panel: Aluminum

Top Cover: Steel

Chassis: SECC steel with reinforced double-layer bottom plate

Control Knobs: Aluminum

Front-Panel Lighting: Adjustable edge illumination

Available Finishes: Black, silver-gold

Power Consumption: 220 W

Standby Power Consumption: 0.3 W

Dimensions (H × W × D): 5.1" × 17.4" × 17" (130 × 443 × 432 mm)

Weight: 36.81 lb.