Marantz Stereo 70s

2ch A/V Receiver w/ 8K HDMI, Subwoofer Output, & HEOS Streaming Built-In

Marantz Item # STEREO70S

Marantz Stereo 70s

2ch A/V Receiver w/ 8K HDMI, Subwoofer Output, & HEOS Streaming Built-In

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Enter a world of exquisite sound and elevated enjoyment of all your home entertainment sources without overwhelming your room with surround speakers. STEREO 70s incorporates the technologies found in full-size surround sound home theaters including audio streaming, Phono and FM/DAB+ radio with the simplicity and elegance of a two-channel stereo system and the warmth, spaciousness, and detail characteristic of Marantz.

High Notes

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Home Theater Flexibility

The Stereo 70S may only be two channels but has everything you would expect to see in a home theater receiver from a video standpoint. Improving your TV sound will be simple with the Stereo 70S and its 6 HDMI inputs.

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Classic Natural Warm Marantz Sound

Marantz uses their famous HDAM tech in the Stereo 70S and we have to say it sounds just fantastic in both two channel and with video sources. And we love the way you can add a subwoofer and fine tune it just like in a home theater processor for the best performance.

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Beautiful on Your Cabinet

The slim and elegant design of the Stereo 70S allows it to fit in many places a larger home theater receiver would look out of place. We really like the homage to the original Marantz units with the symmetrical front panel and Marantz portal.

Company History

This article is on the new Marantz Stereo 70S which promises not only excellent two-channel sound but comes packed with a wealth of features we normally see on home theater receivers.

Ever since the early days when Saul Marantz founded the company, they have been all about producing a very natural sound that is true to the music. His other goal was to make products that would last a very long time. You can certainly tell Saul Marantz delivered on both of these as most of the early Marantz products from separates to stereo receivers command very high used prices, still work well, and have that natural Marantz sound.

Marantz is so serious about keeping that natural sound that they train engineers to be what they call a Sound Master. It's a highly revered position if you qualify as your job will now be listening to individual parts and prototype units to make sure they deliver the sound that has made Marantz famous.

Marantz Stereo70s in black

Design & Build Quality

A few years ago Marantz did a redesign on some of their units with the introduction of their Model 30 integrated amp and SACD 30n disc player and network streamer. These had a new faceplate with the classic Marantz porthole display front and center. The new Stereo 70S follows in this tradition with the same look as those great units but in a slimline chassis meaning it is only 4.1 inches tall. It now looks much more like a nice two-channel piece of gear with the omission of all the little buttons and knobs.

We think this is a big step up in design over the NR1200 unit the Stereo 70S replaces. And funny enough, it was 70 years ago, and 1953 when Saul Marantz founded the company so the name is very fitting.

Marantz has taken what was already a nice unit in the NR1200 and really upped the game from a video standpoint.

The NR1200 came about as Marantz was observing a new type of music lover emerging who was primarily interested in good sound, but also wanted to have their TV in the same room as their stereo system. This new listener does not really care about surround sound but does want better audio from their TV experience and the best possible audio for the money with stereo listening.

With their history of making amazing sounding two-channel components and home theater products with some of the best features and sound on the market, they came up with the idea of combining those two technologies into a compact unit that had natural Marantz sound with some useful video switching plus convenience features and options usually only found in full-fledged surround AVRs. The NR1200 was the result and the Stereo 70S is an even better follow-up to its success.

Marantz Stereo70s in black in a wooden console under television

The Stereo 70S is pretty compact in size at about 4 ½” tall, roughly 15” deep, and the standard audio component width of 17”. What is interesting, is it weighs more than a lot of 5 and 7-channel home theater receivers at 18.5 pounds, mostly due to the large power transformer which helps give it that warm, natural sound. Keeping the compact height while maintaining great sound was really important to their engineers as they wanted the Stereo 70S to be able to sit on top of a credenza and not look out of place.

Marantz also does not mess around with the power ratings and tries to make you think it has more power than it really does. You’ll find it rated with both channels driven at .08% distortion across the full audio band of 20-20,000 hz at 75 watts per channel. Had they used the spec many brands use of just measuring at 1000 Hz and higher distortion, it would deliver 100 watts per channel. Its very beefy power amp section should be more than plenty for almost any speaker that would make sense to pair with the Stereo 70S, especially things like the Bowers & Wilkens 600 series, which would make a great match.

The elegant front panel looks similar to their latest releases with the look of carbon fiber on the sides and a raised section containing a few key controls. On the Stereo 70S you’ll get a larger input knob with smaller ones for a speaker selector for the two possible pairs, balance, bass, treble, and then another larger one for volume. The power button on the left is symmetrically placed with the dedicated ¼” headphone jack on the right. The Marantz porthole which gives you a view of what you are controlling is in the center. Ever since the early days of the classic Marantz integrated amps, their front panels have kept this great simple, but totally balanced look.

When we tested the NR1200 back in 2019, we felt the volume knob was a little flimsy. Marantz must have listened as the Stereo 70S volume knob feels very solid and tight.

Close up of bass, treble and volume knobs on Marantz Stereo70s in black

Features & Technology

From a feature standpoint, the Stereo 70S is very similar to their better home theater receivers with just two-channels.

You’ll find 6 video inputs, 3 of which are capable of 8K, and one output which also serves as an Audio Return Channel connection for TVs that have this. New for this year is the ability to upscale any 1080P or 4K signal to 8K, which you can select in the very intuitive setup menu. Speaking of the menu, this is a good one. It has a wizard to walk you through everything which is nice, but if you take a deeper dive, it has great on-screen explanations for every single choice helping you get the best from your new Stereo 70S.

All of the video inputs support the formats you expect in a nice home theater receiver with HDR, HLG, Dolby Vision, HDR10+, and Dynamic HDR. ALLM or Auto Low Latency is there too and it has a pass-through for gaming where you can select the pass-through input you desire in the setup menu. They all also support VRR or Variable Refresh Rate.

Marantz Studio 70s - back view

The input setup menu is very flexible and allows you to select an analog or digital source to go along with your video signal for those of us who like to listen to the local announcer on the built-in FM tuner or included Tune In internet radio while we watch the national video feed.

On the audio side are 3 analog inputs, a coax and toslink digital input, and a USB A host input. Vinyl lovers will appreciate the nice moving magnet phono input. This uses the same phono preamp as their more expensive receivers have.

The speaker connections are all gold plated with the ability to use either bare wire or banana plugs. These are a little nicer than you normally see in the price range and should allow you to torque down the bare wire pretty well and the bananas had a nice tight fit.

There is a main preamp out and a zone two one which would let you add more power and/or another amp to power a second zone. While the preamp outs are always active, in the menu, you can select a preamp only mode which disconnects the loudspeaker outputs thereby creating a lower distortion and higher max voltage out. This feature means customers can find a sensible upgrade path should they eventually desire more power or an even higher quality amplifier.

You’ll find a subwoofer one and subwoofer two connections on the rear, but bear in mind they are in parallel and not discrete. But for what is a two-channel receiver, you get far more control over the subwoofer than you do in most. You can select the crossover frequency in 10Hz increments up to 120hz, then it jumps in bigger steps. There are adjustments for the main speakers' distance and the sub, along with level controls for each.

There is also a neat feature called Smart Select on the remote with four buttons. These let you take 4 sources and do all kinds of configurations you can pull up with these buttons.

Finally, the rear has wifi antenna connections, a Bluetooth antenna connection, an ethernet connection, and the normal Marantz control ports which let you talk to other Marantz products.

Like all Marantz products, their streaming Heos system is included. This will give you a world of access to many Hi-Res streaming music services. You also have Airplay 2 and Bluetooth. Voice control lovers will appreciate the updates this year with Google Assistant, Alexa, Siri, and Josh AI all being choices you could use. But we have to say, for basic listening, the remote control is pretty elegant too and easy to read and use. The remote includes a backlight.

Marantz Stereo70s in black on a shelf next to a speaker

Another neat feature is a Marantz technology called M-DAX. This will improve the sound of low-res audio, which would come in very handy for Pandora streaming lovers. And you can easily defeat it for your true high-fidelity sources. It's also easy to put the Stereo 70S in different modes from the remote. The listening modes are “Stereo”, which will include M-DAX if it is on and the tone controls; “Direct” which will bypass M-DAX and the tone controls, and finally “Pure Direct” which turns off the display circuitry to give you that last bit of noise reduction.

Ok, that is a lot of features, so now let's talk about what Marantz used to make this new receiver sound so good.

The DAC’s inside the Stereo 70S can handle Hi-Res Audio up to 24/192 and DSD up to 5.6 megahertz. The power amp portion is very similar to what they use in their more expensive audio-only integrated amps. The power amp section is a fully discrete Class A/B design just like what you find in high-performance separate power amplifiers.

But the real magic came in with the addition of HDAM. Marantz developed HDAM or High Dynamic Amplifier Modules back in 1992. They consist of fully discrete circuitry with hand-selected components to give you the quietest possible signal path in the preamp stage of their products. This is the first time HDAM has shown up in a Marantz slimline 2 channel receiver. Units we have heard with HDAM have an almost completely silent background which helps allow all of those tiny details in your music to come to life.

Performance Testing

We connected the Stereo 70S up to a pair of Bowers & Wilkins Anniversary Edition 606S2 on their dedicated stands and plugged in their entry-level but very good ASW608 subwoofer. We loved the way we could use the Marantz menu to really dial in the subwoofer just like on a nice home theater receiver. In our space, we wound up with the crossover set at 80hz, but it was great to be able to experiment quickly using the remote and a TV we had connected. It makes integrating a sub into a 2 channel system super simple. For those of you new to integrating subs, you might want to check out our video on how to integrate a subwoofer.

We then used Tidal with Heos to stream a few of our favorite test tracks, then we used a Pro-Ject EVO turntable to check out the phono preamp.

I have to say, this is one heck of a great-sounding unit for its cost. HDAM is just dead silent so your music seems to come from a completely black background with excellent imaging. With the sub engaged, we could rock out in our fairly large room with never a sense of strain. We did later try it without the sub and found the bass could get a little out of control if we really pushed it, but for what this unit is, it did a great job. We can’t expect it to sound like the bigger Marantz units that cost 2-3 times as much. And the best part is, even after our fairly long listening session, there was zero sense of strain. The Stereo 70S captures that pure and natural Marantz sound people have loved for 70 years.

Marantz Stereo70s in black on a bookshelf

Overall Recommendation

Marantz has done a wonderful job of integrating a host of great features into a unit that can really hold its own in the two-channel world.

If you are someone with a soundbar or have a basic streaming speaker and are ready to move into the fun world of separate audio components, the Marantz Stereo 70S and a modest pair of bookshelf speakers will blow your mind at how much better it sounds. You’ll have all of the video switching you need for TV viewing and have something that your vinyl friends will be very impressed with when they hear it on your turntable. It will look great, is easy to use, can grow with you, and sounds fantastic for its price. While you probably can find a pure analog only two-channel integrated amp at about this price that might sound better, you will not find anything we know of with all this nice connectivity that sounds this good. Highly recommended.

Details & Specs
Marantz Stereo 70s Slimline AV Receiver with HEOS Built-In
Photo of the back of the Marantz Stereo 70s with an HDMI cable plugged in
Home Cinema from Only Two Channels

Home theater flexibility meets stereo simplicity. STEREO 70s elevates audio whether from music or movies.

Photo of hand holding an iPhone with Heos app showing on screen
HEOS® Streaming Built-In

Integrated HEOS® streaming technology unlocks the potential in streaming services. Support for Spotify Connect, Airplay 2, Bluetooth, Tidal, TuneIn, and many more make discovering music in high fidelity exciting and easy.

Photo of Stereo 70s internals
75 Watts Per Channel

The fully discrete stereo amplifier built-in produces plenty of power to drive a wide range of loudspeakers.

Photo of Stereo 70s in a media cabinet below tv
HDMI 8K/60, 4K/120

Ultra-high resolution and high frame rate for gaming are here, and on the horizon, for movies and TV. STEREO 70s is ready with the latest HDMI technology built in. STEREO 70s connects streaming systems, game consoles, and even smart TVs.

Gold Stereo 70s in media cabinet
Slim and Elegant

Meticulously engineered in a compact chassis, STEREO 70s fits where normal equipment cannot.

Photo of circuit board in Stereo 70s
Marantz HDAM Technology

Marantz developed discrete circuit boards called Hyper-Dynamic Amplifier Modules (HDAMs) to replace the chip-based op-amps used by most brands. HDAMs outperform regular integrated operational amplifiers dramatically in slew rate and noise level. The result is much more dynamic, accurate, anddetailed sound.

Key Features

Home Cinema from Only Two Channels

Home theater flexibility meets stereo simplicity. STEREO 70s elevates your audio whether from music or movies.

Dynamic, Warm and Spacious Sound

Carefully engineered with specially chosen components, STEREO 70s unveils the natural immersiveness and power of sound.

Slim and Elegant

Meticulously engineered in a compact chassis, STEREO 70s fits where normal equipment cannot.

HEOS® Streaming Built-In

Integrated HEOS streaming technology unlocks the potential in your favorite streaming services.

75 Watts Per Channel

The fully discrete stereo amplifier built-in produces clear, detailed, warm, spacious, and dynamic sound from any source.

Six HDMI Inputs, Including 8K

STEREO 70s is compatible with a variety of streamers, game systems, and TVs thanks to six HDMI inputs, three of which are 8K.

Dual Subwoofer Outputs

Add deep and impactful bass with two subwoofer outputs. Control crossover characteristics in the setup menu.

Pre-Amp Output

Leverage pre-amp mode to connect to an external amp for even higher sound quality and more power should you decide to upgrade later.

Backlit Remote Control

A button on the side of the remote is easy to feel in the dark. One click and the buttons light up for intuitive use in dimly lit rooms.

Phono Built In

Express your musical taste by connecting a turntable directly to STEREO 70s— no external equipment needed.

Five-Year Warranty

Marantz is built with care. A five-year parts and labor warranty protects your investment in The Most Musical Sound.

Onboard Technologies

HDMI 8K/60, 4K/120

Ultra-high resolution and high frame rate for gaming are here, and on the horizon for movies and TV. STEREO 70s is ready with the latest HDMI technology built in. Connect your streaming systems, game consoles, and even smart TV apps via HDMI and control everything with a single remote.

Hyper Dynamic Amplifier Modules

Marantz developed our own discrete circuit boards called Hyper-Dynamic Amplifier Modules (HDAMs) to replace the chip-based op-amps used by most brands. Using discrete surface-mount components with short mirror-image left and right signal paths, HDAMs outperform regular integrated operational amplifiers dramatically in slew rate and noise level. The result is much more dynamic, accurate, and detailed sound. Over the years, Marantz has developed different HDAMs to fit the specific requirements of players and amplifiers. STEREO 70s uses the SA2 version.

Marantz Tuned Class A/B Amplification

STEREO 70s powers your speakers using tried and true Class A/B amplification. We specially select components for their sound quality and durability and tune the response of the amplifier to reproduce the warmth, detail, dynamics, and 3D spaciousness of the original recording.

High Resolution Audio

Crystal clear digital decoding of up to 192 kHz 24-bit audio and DSD opens a new world of high- resolution music with depth, breadth, and clarity not available with lossy files.

HEOS® Streaming Built-In

STEREO 70s grants access to your favorite streaming services through the built-in HEOS ecosystem. Support for Spotify Connect, Airplay 2, Bluetooth, Tidal, TuneIn, and many more make discovering music in high fidelity exciting and easy.


Build a whole-home listening oasis by connecting other HEOS enabled devices to your home network. Synchronize rooms to the same audio or let them play independently. STEREO 70s also has Zone 2 audio out so you can connect it to power amp in another room. Or use the A+B speaker functionality to power a second pair of speakers in another room directly from STEREO 70s.

Headphone Out—wired or Bluetooth

Late-night listening is more enjoyable than ever with the ability to play though your favorite headphones. Connect wired headphones through the front panel port or use the Bluetooth output to connect to your wireless headphones.

Power Amplifier
Number of Powered Channels 2
Power Output (8 ohm, 20 Hz–20 kHz, 0.08% 2ch Drive) 75 W
Discrete Power Amplifier Yes
Amplifier Topology Class A/B
Video HDMI In / Out
Analogue In / Fixed Level Out 3 / 0t
Phono (MM) In Yes
Digital In: Optical / Coaxial 1-Jan
Multi-Room Out: Analogue / Digital Jan-00
Multichannel Pre-Amp Out 2.2
Subwoofer Out 2
Number of Speaker Terminals 4
Speaker A / B Yes
DAB/FM Tuner Yes
Total HDMI Inputs / No. Support 8K 3-Jun
HDCP 2.3 Support Yes
HDMI Outputs: Main / Zone Jan-00
HDMI Upscaling 1080p/4K to 8K
Max. Resolution / Frame Rate 1080p/4K to 8K
Audio Return Channel ARC
Video Dynamic Range HDR / HLG / Dolby Vision / HDR10+ / Dynamic HDR
ALLM (Auto Low Latency Mode) Pass-Through for Gaming Yes
Variable Refresh Rate / Quick Frame Transport Yes / Yes
HDMI Pass-Through in Standby Mode Yes
Auto LipSync Yes
Performance Technologies
Hyper Dynamic Amplifier Modules (HDAM) Yes
Source Direct Mode Yes
Gold-Plated RCA Terminals Yes
High Grade Audio Components Yes
Music File Support
Lossy Formats MP3 / WMA / AAC
Lossless formats FLAC HD 192/24 / WAV 192/24 / ALAC 192/31
DSD Audio 2.8 MHz / 5.6MHz
Gapless Playback FLAC, WAV ,ALAC ,DSD
Compressed Audio Enhancer: MDAX2 Yes
Network Audio Sharing Yes
Streaming Services
HEOS® Multi-Room and Streaming Yes
AirPlay Audio Streaming AirPlay 2
Internet Radio TuneIn
Spotify Spotify Connect
Other Streaming Services Amazon Music HD/ Amazon Music / TIDAL / Deezer / Napster / Soundcloud
Roon-Tested Yes
Network Connectivity
Ethernet Ports Yes
Wi-Fi Yes
Bluetooth Yes
Bluetooth Re-Transmit for Bluetooth Headphones Yes (with volume control)
Smart Home Integration & Control
Voice Assistant Compatibility Alexa / Apple HomePod
App for Smart Phones & Tablets (iOS/Android) Marantz AVR App
Multi-Room Zones 1
Zone Audio Source: HDMI / Opt, Coax / Network, USB / Analogue 2 Ch / 2 Ch / Yes / Yes
Zone Audio Output: Speaker / Pre-Out - / Yes
Control Connectivity IP Control / Web Control / App Control
IR Flasher In Yes
Marantz Remote Bus Yes
HDMI Diagnostics Yes
System Remote Control RC-052SR
Power Consumption in W 210 W
Standby Consumption in W 0.2 W
CEC Standby Consumption in W 0.5 W
Network Standby Consumption in W Less than 2.0
Maximum Dimensions w/o Antenna: (W × D × H) 442 x 375 x 109mm
Weight 8.4kg
Carton Dimensions (W × D × H) 520 x 496 x 208mm
Weight box 11.0kg
What's in the box Main unit, remote control, batteries, DAB/FM antennas, wire labels, quick start guide, 2 external detachable antennas, AC cord
More Information
UPC 747192140267
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