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Amp Multi

Amp Multi

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Built for professional installation, Amp Multi provides unmatched multi-zone flexibility with GaN and PFFB technology to completely redefine what an 8-channel amplifier can do.

Amp Multi delivers 8 x 125W of power across up to four zones, leveraging advanced GaN technology and post-filter feedback (PFFB) for greater efficiency, clarity, and control. With ProTune, installers can optimise the sound for any low-impedance passive speakers, tailoring performance to placement and room acoustics. ProTune offers a full suite of manual controls, including a 10-band parametric EQ plus adjustable gain and delay offsets, enabling truly bespoke audio experiences. Its innovative chassis design enhances thermal performance, while recessed connectors, status LEDs, and a streamlined 2U rack mount simplify setup and ensure reliable, fanless cooling.

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Precision-built for professionals

Backed by thousands of hours of research and engineering, Amp Multi was built from the ground up to streamline professional installation at every stage. It’s designed to support your workflows and help you deliver bespoke audio experiences with precision and efficiency.

Multi-zone flexibility

Each output can be assigned to any zone, giving you complete flexibility in system design. Users can easily change audio sources and content, ensuring a seamless, consistent experience.

Built to breathe

The Rack Mount creates space above and below each unit to support airflow in a clean, 2U configuration.

Streamlined installation

With its flat back design, Amp Multi slides easily onto the Rack Mount. Installation is satisfyingly simple.

Space-saving design

Amp Multi eliminates the need for vent panels between rack units and reduces the number of screws required for installation, saving time, rack space, and hardware.

Looks right at home

Whether on a shelf, credenza, or mounted to the wall, Amp Multi’s compact design and refined finish make it an elegant addition to any space. It looks just as polished in plain sight as it does tucked into a rack.

Audio

Speaker Outputs

8 amplified outputs each independently configurable for stereo or mono

Power

125 W per channel @ 8Ω (all channels driven)

Minimum Impedance

2.67Ω with Sonos Architectural speakers

Damping Factor

>400 (ref. 8 ohms, 20 Hz to 1 kHz)

Amplifier Technology

Class D with GaN and PFFB

Total Harmonic Distortion

0.005% at 2.83Vrms-15Vrms

Frequency Response

±0.5 dB, 15 Hz - 20 kHz

Channel Separation (Crosstalk)

-100dB at 1 kHz 2.83Vrms
-80dB at 10 kHz 2.83Vrms

Signal-to-Noise Ratio

114dB ref 125W into 8-Ohm

ProTune

10-band parametric EQ with ±15dB gain, Q, and frequency control.
Option for high-shelf, low-shelf, and bell filter types.
Gain trim: -15 - +5 dB
Delay: 0 - 50ms
Highpass: 15-100Hz
All available on per-channel basis

Optimise Sonos Speakers

When selected in the Sonos app, Optimise Sonos Speakers allows Amp Multi to recognise Sonos Architectural speakers, then applies custom tuning and DSP to provide more robust sound with a more even frequency response, optimising system performance and ensuring stable operation.

Power and Networking

Power Consumption

5.4 W (idle)
180 W (all channels driven at 1/8 output
power, 8 Ohms)

Power

Auto-switching 100-240V 50/60Hz 10A AC universal input

Wired Networking Interface

100BaseTX, Ethernet RJ45

Wireless Networking Interface

Compatible with WiFi 6. Connect to Wi-Fi with any 802.11a/b/g/n/ac/ax 2.4 GHz/5 GHz broadcast-capable router.

Analogue Audio Input

2 x RCA inputs -10dB (stereo into one zone)

USB-C Analogue Audio Input

44.1 kHz / 16 bit (stereo into any zone) Requires Sonos Line-In Adapter

Subwoofer Connections

1 x RCA output -10dB (configurable to output from one zone), and 1x Sonos Sub per zone

Direct Streaming Formats

Apple AirPlay 2, Spotify Direct Control, and more.

CPU

Quad Core
4xA55 1.9GHz

Physical

Dimensions (Single Unit)

Height: 2.52 in (64.5 mm)
Width: 17.2 in (436.8 mm)
Depth: 10.44 in (265.2 mm)

Dimensions (with 2U Rack Mount)

Height: 3.47 in (82.3 mm)
Width: 19.01 in (483 mm)
Depth: 10.44 in (265.2 mm)

Weight

11.16 lbs (5.06 kg)

Colours

Black

Finish

Matte

LEDs

Front: Device status
Rear: Device status, output status (x8), RJ45 status light

FAQ

What is the warranty length for Amp Multi?

Amp Multi comes with a 3-year warranty, giving you peace of mind and reliable coverage.

Is the 125 W per channel rating peak power or continuous?

Amp Multi delivers 125 watts of continuous (RMS) average power per channel into an 8-ohm load, with all channels driven.

What is the damping factor of Amp Multi?

The damping factor is approximately 437 when paired with an 8-ohm speaker.

What if I’m in a noisy environment and my device can’t hear the setup chirp?

If the chirp is not detected, you can enter the PIN printed on the back of the unit directly in the Sonos app.

How much clearance does Amp Multi need for airflow if it’s not rack-mounted?

We recommend allowing at least four inches (10 centimetres) of space on the top and sides for proper ventilation.

Does Amp Multi support Trueplay?

No, Amp Multi introduces ProTune, a manual tuning feature that lets you fine-tune the sound for any low-impedance passive speaker and room. When used with Sonos Architectural speakers, enabling Optimise Sonos Speakers applies custom tuning and DSP tailored to their unique acoustic design.

Why is Amp Multi 1.5U in height, and how does that fit in a rack?

Amp Multi shares the same 1.5U height as Sonos Amp, ensuring consistency when mixing device types. The Rack Mount (sold separately) adds an extra 0.25U of space above and below the unit—for a total height of 2U—for optimal airflow and easier access without wasting rack space.

Why doesn’t the Rack Mount include additional rack screws?

Amp Multi supports Sonos Sub 4, Sub (Gen 3), and Sub Mini. You can assign one Sonos Sub per zone, up to four total. The subwoofer output port supports a powered third-party sub, which can be freely assigned to any zone in the app.

How do I assign the subwoofer output to a specific zone?

In the Sonos app, go to Zone Settings, select Connect Sub, and follow the instructions to assign the subwoofer output to the desired zone.

How many subwoofers can Amp Multi support?

Amp Multi supports Sonos Sub 4, Sub (Gen 3), and Sub Mini. You can assign one Sonos Sub per zone, up to four total. The subwoofer output port supports a powered third-party sub, which can be freely assigned to any zone in the app.

Why doesn’t Amp Multi include HDMI like Sonos Amp?

Amp Multi is purpose-built for bespoke, distributed audio applications. If you need HDMI connectivity for TV or home cinema setups, Sonos Amp or a Sonos soundbar is the best fit, with both offering the ability to work seamlessly alongside Amp Multi in the same system.

Why does Sonos Amp have two Ethernet ports, while Amp Multi only has one?

Sonos Amp includes two ports for daisy-chaining multiple units, supporting up to four zones. Amp Multi’s design eliminates the need for extra ports while simplifying installation.

How do the audio stream inputs work, and how many AirPlay 2 connections are supported?

Each zone can utilise a separate source or stream. If Amp Multi is set up for four zones, each one can support its own AirPlay 2 stream, Spotify Connect session, or playback from the Sonos app.

Is Bluetooth® supported?

No, Amp Multi does not include Bluetooth connectivity.

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