Short answer: the O.S. Acoustics DBS8. Both are rated 4.4/5 for sound quality (#35 and #41 of 119 powered bookshelf speakers), and the O.S. Acoustics DBS8 costs $5,600 against $7,998 for the Devialet Phantom Ultimate 108dB, with sound quality a draw, the lower price decides it.
The Devialet Phantom Ultimate 108dB is the more accurate, deeper-bass pick. A single cabinet wireless speaker with astonishingly deep bass, nearly flat sound, and full streaming support for a complete music system. Its measured preference score, a predictor of how neutral it sounds, is 6.73 against 5.88 for the O.S. Acoustics DBS8. Its bass reaches about 21Hz before falling 3dB, against 48.5Hz for the O.S. Acoustics DBS8. Watch for: DSP limiting and compression take over near maximum volume, so the deep bass you hear at moderate levels shrinks when you push it; Erin’s 96dB distortion test ran into the limiter.
Why pick the O.S. Acoustics DBS8: Sealed active studio monitors with balanced sound and DSP adjustment, a good fit for a system with a subwoofer. The catch: The measured -3dB point is 48.5Hz, not especially deep for a large monitor.
Buy the O.S. Acoustics DBS8. Both are rated the same for sound quality, and it costs $2,398 less than the Devialet Phantom Ultimate 108dB.
Looking for alternatives? See the complete Powered Home rankings.
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Specifications Side By Side
| Devialet Phantom Ultimate 108dB | O.S. Acoustics DBS8 | |
|---|---|---|
| Price | $7,998 per pair | $5,600 per pair |
| Ranked | #41 of 119 in Large Size Powered Bookshelf Speakers | #35 of 119 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | <21Hz (measured, Erin’s Audio Corner) | 48.5Hz (measured, spinorama.org) |
| Bass Extension (-10dB) | <21Hz (measured, Erin’s Audio Corner) | approximately 35Hz (measured, spinorama.org) |
| Dimensions | 10”H x 9.7”W x 13.5”D (255 x 246 x 342 mm) | 19.8” x 8.7” x 17.2” (502 x 222 x 437 mm) each |
| Weight | 24.5 lbs (11.1 kg) each | 34.8 lbs (15.8kg) each |
| Drivers | Aluminum tweeter, aluminum midrange, two opposed aluminum woofers | Two 6.5-inch aluminum woofers; 1.1-inch ceramic-coated magnesium tweeter |
| Inputs | Wi-Fi, Ethernet, Bluetooth, Optical | Balanced XLR |
| App | Yes (Devialet) | - |
| Bluetooth | Yes | No |
| Bluetooth Version | 5.3 | - |
| Bluetooth Codecs | SBC, AAC | - |
| Wi-Fi | Yes (Wi-Fi 6, dual-band) | - |
| Streaming Services | Yes (AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect, Roon Ready, UPnP) | - |
| Amplifier Power | 1,100W total | 500W LF + 150W HF per speaker |
| Maximum SPL | 108dB (manufacturer specified) | 105dB (manufacturer specified) |
| Frequency Response | 14Hz - 35kHz (Manufacturer specified) | 35Hz - 21.5kHz (±2 dB > 50Hz) (Manufacturer specified) |
| Spinorama Preference Score | 6.73 | 5.88 |
| Spinorama Preference Score with Perfect Sub | 7.38 | 7.85 |
| Subwoofer Output | No | - |
| XLR Input | No | Yes |
| RCA Input | No | No |
| TRS Input | No | No |
| Optical Input | Yes | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | No |
| Enclosure | - | Sealed MTM |
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