Arc Ultra sits at the top of the Sonos home theater line and introduces Sound Motion, a four-motor dual-membrane woofer that delivers real low-frequency output from a bar less than three inches tall. Around it, nine angled silk-dome tweeters and six midwoofers are driven by fifteen Class D amplifiers to build a 9.1.4 Dolby Atmos soundstage, bouncing height and surround channels off the ceiling and side walls so effects move above and beside the listening position.
Installation is a single HDMI eARC run using the supplied cable, after which Trueplay measures the room and corrects the bar's response for its actual placement. Speech Enhancement applies AI-assisted dialogue detection with selectable strength, a practical fix for dense mixes and reflective rooms. WiFi 6, Bluetooth 5.3, and Apple AirPlay 2 cover music, and the system expands with a Sonos Sub and a pair of rear surrounds. Its 46.38-inch width suits large rooms and screens of roughly 55 inches and larger. This listing is the matte black finish.
Key Features
- 9.1.4 spatial audio with Dolby Atmos
- Sound Motion four-motor, dual-membrane woofer for deep bass in a slim cabinet
- Nine silk-dome tweeters and six midwoofers, fifteen Class D amplifiers
- HDMI eARC connection with cable included
- Speech Enhancement with AI dialogue detection
- Trueplay room tuning, WiFi 6, Bluetooth 5.3, and AirPlay 2
- Expandable with a Sonos Sub and rear surrounds
Why Buy This From 4TEC Direct
4TEC Direct is an authorized Sonos dealer, backed by 4TEC Integration — the commercial AV design and installation firm we have run since 2003, with over 35 years of combined experience in commercial AV design, programming, and sales. The people who answer your call are the same engineers who scope conference rooms, training centers, and whole-home audio systems every day.
- Authorized Sonos dealer — genuine, factory-fresh product with full manufacturer warranty
- Certified designers and programmers on staff — CTS, CTS-D, and CTS-I credentialed
- Free pre-sale system design — call before you order and we will spec the right zones, amps, and speakers
- Professional installation and 24/7/365 managed support available through 4TEC Integration
- Serving clients since 2003 from Omaha / Gretna, Nebraska — shipping nationwide
Questions before you buy? Talk to a real AV engineer: 402-909-0130 or sales@4tecdirect.com.