Sonos Arc Ultra vs Polk Audio MagniFi Mini AX
Sonos's flagship single-bar Atmos system against Polk's sub-$500 compact with a physical subwoofer included — how much of that premium sound actually depends on the price.
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TopsFive comparison scores
8.5 / 10
Sonos Arc Ultra
8.2 / 10
Polk Audio MagniFi Mini AX
Side by side
| Sonos Arc Ultra | Polk Audio MagniFi Mini AX | |
|---|---|---|
| Price | $1099 | $499 |
| Channels | 9.1.4ch (single bar, no external subwoofer included) | 3.1.2ch (soundbar + wireless subwoofer) |
| Dolby Atmos | Yes (native, hardware height channels) | Yes (native height channels via up-firing drivers) |
| Subwoofer | Not included (Sub 4 / Sub Mini sold separately) | Included (wireless) |
| HDMI eARC | Yes | Yes |
| Wireless Streaming | Wi-Fi, AirPlay 2 (no Bluetooth) | Bluetooth only (no Wi-Fi) |
| Voice Assistant | Amazon Alexa and Sonos Voice Control built-in | None built-in (works with TV remote/voice passthrough) |
| Width | 45 inches | 11.75 inches |
Sonos Arc Ultra
- New Sound Motion woofer technology delivers noticeably deeper bass than the original Arc without a separate subwoofer for most rooms
- 9.1.4-channel array with dedicated upward-firing drivers for real Dolby Atmos height cues, not just virtualization
- Deep integration with the Sonos app and ecosystem (Era speakers, Sub, other Sonos gear)
- Sonos Voice Control and Alexa built in for hands-free control
- No Bluetooth or analog input of any kind — it is Wi-Fi only, which can be inflexible for non-networked TVs or older AV setups
- A full surround setup (rear speakers plus a Sub) pushes total system cost well past $1,500
- Trueplay room tuning requires the Sonos app's built-in microphone rather than an included calibration mic
Polk Audio MagniFi Mini AX
- One of the smallest Dolby Atmos and DTS:X-certified soundbars available, at just 11.75 inches wide
- Includes a dedicated wireless subwoofer in the box, unlike the similarly priced Sonos Beam
- Polk's VoiceAdjust dialogue enhancement noticeably improves speech clarity without a separate center channel
- Simple setup with no app or home Wi-Fi network required
- No built-in voice assistant or app-based automatic room correction
- Bluetooth-only wireless streaming — no Wi-Fi, AirPlay, or multi-room support
- Height-channel effects are more modest than the larger bars on this list, given its compact up-firing drivers
Which should you buy?
Choose the Sonos Arc Ultra if
- Sonos multi-room households
- Buyers who want the best single-bar Atmos sound without a subwoofer taking up floor space
- iPhone/iPad households (for Trueplay tuning)
Skip it if
- Non-Wi-Fi or non-networked TV setups
- Bluetooth-only source devices
Choose the Polk Audio MagniFi Mini AX if
- Small TV stands and apartments
- Buyers who want a physical subwoofer without flagship pricing
- Simple, no-app setups
Skip it if
- Multi-room or whole-home audio setups
- Buyers wanting Wi-Fi streaming or a built-in voice assistant