Marantz Model 40n Stereo Network Amplifier

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A premium integrated amplifier with HEOS built-in. The Marantz MODEL 40n is rated at 70 W per channel into 8 ohms and 100 W into 4 ohms, with HDAM-SA3 circuits, an MM phono input, HDMI ARC and streaming over AirPlay, Bluetooth and Spotify Connect.

Marantz says it reimagined the integrated amplifier for the digital age while keeping a luxurious analogue feel. It has the classic porthole display and comes in Black or Silver/Gold.

Power

70 W per channel (8 ohms), 100 W (4 ohms)

Streaming

HEOS built-in, AirPlay, Bluetooth, Spotify Connect

HDMI

1 input plus ARC

Phono

MM with Marantz Musical Phono EQ

Circuit

HDAM-SA3, toroidal transformer

Finish

Black or Silver/Gold

Why you will love it

Designed to be seen and touched

Marantz describes the MODEL 40n as following a long line of historic Marantz designs. It has an aluminium front panel, an aluminium volume knob and selector, and the classic porthole display, with edge lighting that can be dimmed.

Marantz MODEL 40n amplifier in Black, seen from above and to the front

Hyper Dynamic Amplifier Modules

The power amplifier uses Marantz's own HDAM-SA3 modules, which Marantz says are faster in speed and response than off-the-shelf modules. A double-shielded toroidal transformer supplies the power section.

Marantz says its Sound Master tuned the MODEL 40n through careful parts selection.

Streaming with HEOS

HEOS built-in lets you stream from services including TIDAL, Amazon Music and TuneIn, and control multiple rooms from the HEOS app. AirPlay, Bluetooth, Spotify Connect, Roon Ready and DSD support are listed among its key technologies.

Rear panel of the Marantz MODEL 40n showing HDMI, digital and analogue inputs and speaker terminals

Connections for your whole system

HDMI input with ARC (PCM only) takes TV sound. Analogue inputs are Phono (MM), CD, Line and Recorder, with a recorder output. There are also optical and coaxial digital inputs, a rear USB-A port, a subwoofer pre-out with selectable low-pass filter and a power amp direct input.

Marantz lists Control4 among its key technologies, and the system remote controls the amplifier and a Marantz CD player.

Is it right for you?

A great fit if you…

Want one amplifier for streaming, a turntable and a TV
Like the classic Marantz look and porthole display
Want HDMI ARC for TV sound
Plan to add a matching CD player such as the CD 60

Worth knowing

The HDMI input is ARC with PCM only. It is not an HDMI switcher
The phono input is MM only
There is no pre-out for a separate power amplifier
At about 36.8 lb (16.7 kg) it needs a sturdy shelf

Build your system

CD player: Marantz names the Marantz CD 60 CD player as a partner. The Marantz SACD 30n streaming SACD player also suits
Speakers: Choose bookshelf speakers or floor-standing speakers
More: Add a turntable, or see the Marantz MODEL 60n and all stereo amplifiers

Specifications

Amplifier

Rated output power	70 W + 70 W (8 ohms), 100 W + 100 W (4 ohms)
Power amplifier circuit	HDAM-SA3
Power transformer	Double-shielded toroidal
Frequency response	5 Hz to 50 kHz
Total harmonic distortion	0.02% (20 Hz to 20 kHz, 8 ohms)
Damping factor	100
S/N ratio	Phono (MM): 87 dB. CD: 106 dB

Inputs and outputs

Analogue inputs	4 (Phono, CD, Line, Recorder), 1 x Recorder out
Phono input	MM, 2 mV / 47 kohm, Marantz Musical Phono EQ
CD/Line/Recorder sensitivity	220 mV / 20 kohm
Power amp input	1.6 V / 15 kohm
Optical input / coaxial input	1 / 1
HDMI	1 input plus ARC (PCM only)
USB-A	1 (rear), Mass Storage Class, 5V/1A
Subwoofer pre-out	Low-pass filter selectable 40 / 60 / 80 / 100 / 120 Hz
Speaker terminal	SPKT-1+

Controls

Volume	Electric
Tone controls	Bass, treble, balance
Source Direct	Yes
Control	HEOS app, system remote (amp and CD player control)
Remote control bus	RC-5 in / out

General

Dimensions (W x H x D)	17.4 x 5.1 x 17 in
Weight	36 lb 13 oz
Power consumption	220 W (standby 0.3 W)
Front panel / top cover	Aluminium / steel
Chassis	SECC, thicker double-layer base
Finishes	Black, Silver/Gold

Specifications from Marantz Australia's MODEL 40n product page, checked November 2026.

Questions people ask

How much power does it have?

Marantz rates it at 70 W per channel into 8 ohms and 100 W per channel into 4 ohms.

Does it have a phono input?

Yes. It is an MM input with Marantz Musical Phono EQ.

Can I connect my TV?

Yes. The HDMI input with ARC takes TV sound (PCM only). There are also optical and coaxial inputs.

How do I stream music?

With HEOS built-in, AirPlay, Bluetooth or Spotify Connect, controlled from the HEOS app.

Does it have a subwoofer output?

Yes. A subwoofer pre-out with selectable low-pass filter from 40 to 120 Hz.