About the Marantz Stereo 70s
The Stereo 70s pairs a two-channel stereo amplifier with a full HDMI-switching hub and network streaming, built around a custom discrete high-current power amp with a symmetrical layout and an oxygen-free copper winding transformer. It's rated at 75 watts per channel into 8 ohms (20Hz-20kHz, 0.08% THD), with low-impedance drive capability for a wide range of bookshelf and floorstanding speakers. Marantz's engineers hand-selected the HiFi parts — custom resistors, audio-grade capacitors, a double-differential DAC circuit, and an analog preamp section isolated from the power supply — drawing on design principles from the brand's award-winning amplifiers.
All six HDMI inputs and the single output handle 4K/60Hz video, but three of them (HDMI 4, 5, and 6) plus the output step up to the full HDMI 2.1 spec — 8K/60Hz and 4K/120Hz pass-through at up to 40Gbps, with HDCP 2.3, BT.2020 wide color gamut, and 4:4:4 pure color sub-sampling (the "4K/8K Signal Format" menu needs to be set to "8K Enhanced" for the full spec; Marantz recommends an 18Gbps cable for 4K/HDR or a 48Gbps Ultra High Speed cable for 8K). A dedicated phono input, optical and coaxial digital inputs, and a 32-bit/192kHz DAC round out the connections.
Network features include HEOS built-in, Apple AirPlay 2, Roon Ready certification, built-in Wi-Fi and Ethernet, and high-res audio playback from the network or a USB-A thumb drive. Bluetooth 5.0 works in both receiver and transmitter modes, and an AM/FM tuner is built in alongside Alexa and Google Assistant voice compatibility. Two zones are supported, with dual subwoofer outputs, two pairs of binding-post speaker outputs, a 1/4" headphone jack, and two stereo preamp outputs.
Product Highlights
- Stereo amplifier: 75W per channel into 8 ohms, custom discrete symmetrical design
- Six HDMI inputs (three full HDMI 2.1, 8K/60Hz and 4K/120Hz) and one output
- Dedicated phono input, optical and coaxial digital inputs
- 32-bit/192kHz DAC, high-res playback from network or USB-A
- HEOS built-in, Apple AirPlay 2, Roon Ready, Bluetooth 5.0 (receiver and transmitter)
- Built-in AM/FM tuner, Wi-Fi, and Ethernet
- Alexa and Google Assistant voice compatibility
- 2 zones, dual subwoofer outputs, 1/4" headphone jack
- 5-year parts and labor warranty
What's in the Box
- Marantz Stereo 70s receiver
- Remote control with batteries
- AM loop antenna
- FM wire antenna
- AC power cord
- Quick Start Guide
- Warranty Information
Frequently Asked Questions
Q: Does the Stereo 70s have a phono input?
A: Yes, it includes one dedicated phono input for a turntable.
Q: Do all six HDMI inputs support 8K and 4K/120Hz?
A: No, all six support 4K/60Hz, but only HDMI 4, 5, and 6 (plus the output) support the full HDMI 2.1 spec with 8K/60Hz and 4K/120Hz pass-through.
Q: Does the Stereo 70s support Bluetooth for both sending and receiving audio?
A: Yes, its Bluetooth 5.0 works in both receiver mode (streaming from a phone) and transmitter mode (sending to Bluetooth headphones or speakers).
Q: Is the Stereo 70s Roon Ready?
A: Yes, it's Roon Ready certified in addition to HEOS built-in and Apple AirPlay 2.
Q: How many zones does the Stereo 70s support?
A: Two zones.
