Sonos Amp Multi — Redefining Multi-Zone Audio for Pro Installs

The Sonos Amp Multi represents a landmark advancement in the Sonos ecosystem — a professional-oriented, multi-zone streaming amplifier tailored for large residential and commercial audio systems. Built from the ground up for custom installations, it provides unprecedented flexibility, power, and control for distributed audio designs. 

Amp Multi is a rack-mountable, eight-channel streaming amplifier that combines high-efficiency amplification with advanced software-driven flexibility. It is engineered specifically for integrators and installers who need to deliver scalable, multi-zone audio across complex layouts while maintaining the seamless user experience Sonos is known for. 

Amplification & Output

• 8 Amplified Outputs: Independently configurable for stereo or mono operation, enabling flexible zone assignments. 

• 125 W per Channel @ 8 Ω (all channels driven): Strong, consistent power delivery across all outputs without derating under multi-load conditions. 

• High Current Capability: Minimum speaker load down to 2.67 Ω with Sonos Architectural speakers ensures robust drive for demanding passive loads. 

• Class-D Amplification with GaN & PFFB: Gallium Nitride power stages with Post-Filter Feedback deliver high efficiency, low distortion, and reduced heat signatures — all in a fanless design.

Audio Performance Metrics

• THD: 0.005% typical (2.83 Vrms) — excellent fidelity for distributed installations.

• Frequency Response: ±0.5 dB from 15 Hz to 20 kHz — broad, accurate response for music and ambient audio. 

• S/N Ratio: ~114 dB, high clarity over ambient noise.

These specifications place Amp Multi well above typical consumer amplifiers in both power consistency and signal integrity, making it suitable for high-end whole-home audio and commercial spaces where performance really matters. 

Multi-Zone Flexibility

Amp Multi supports four fully independent zones, each capable of playing different audio sources simultaneously. Installers can assign any of the eight outputs to zones based on design needs — a powerful advantage over traditional two-channel solutions.

ProTune Customization

ProTune is an advanced tuning suite built into the Sonos app that allows installers to manually refine each output’s sound to fit room acoustics and speaker placement:

• 10-Band Parametric EQ with adjustable gain, Q, and frequency.

• Gain Trim and Delay: Per-channel gain and delay offsets for coherent multi-speaker alignment. 

• Highpass Filter: Adjustable from 15 Hz–100 Hz for optimized low-frequency management. 

This level of per-zone tuning vastly improves integration outcomes in acoustically challenging environments like open floor plans or mixed-use commercial spaces. 

Networking & Streaming

Amp Multi integrates natively with the Sonos ecosystem:

• Wi-Fi 6 & Ethernet support for robust network streaming.

• Apple AirPlay 2, Spotify Direct Control, and Sonos App control for source flexibility. 

This ensures compatibility with common streaming ecosystems and smart home setups, letting users play different content per zone or group zones for synchronized playback.

Line-Level Inputs & Subwoofer Flexibility

• 2 × RCA Analog Inputs and USB-C Analog Input (requires adapter) provide line-level source options. 

• Configurable Subwoofer Output: Assignable to any zone and supports one Sonos Sub per zone. 

These inputs and outputs allow Amp Multi to bridge traditional audio sources with modern streaming infrastructures. 

Amp Multi’s chassis and physical design are optimized for rack environments:

• 2U Rack Mount Compatibility: Stackable and easy to manage in tight AV closets. 

• Fanless, Thermally Optimized Chassis: Minimizes noise and increases reliability in densely packed racks. 

• Status Indicators: Front and rear LEDs provide real-time feedback during setup. 

These design features shorten install time and reduce common pitfalls in complex audio deployments. 

For custom installers and designers, Amp Multi brings:

• Scalable multi-zone amplification without resorting to multiple discrete amps.

• Pro-level tuning tools for acoustically optimized performance.

• Simplified Sonos ecosystem integration for end users accustomed to intuitive control.

• Rack-ready engineering that respects space, airflow, and installation workflows.

It bridges the gap between consumer convenience and professional audio flexibility — empowering designers to deliver high-end audio experiences with less complexity and greater reliability.

The Sonos Amp Multi elevates Sonos into a professional multi-zone amplifier category. With eight configurable outputs, powerful DSP tuning, robust network integration, and install-centric hardware design, it’s a compelling solution for large homes, hospitality venues, and custom AV systems where zoning, performance, and control are essential.