Short answer: the Genelec S360. It ranks #20 of 68 powered bookshelf speakers by sound quality, rated 4.5/5, at $4775; the Devialet Phantom Ultimate 108dB ranks #29, rated 4.4/5, and costs $7998, so there is little reason to consider the other one.
The case for the Devialet Phantom Ultimate 108dB: Erin’s measurements show full bass output all the way down to about 20Hz, the lowest frequency measured, which is remarkable from a single cabinet about 34cm deep. 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 Genelec S360: A strong choice when professional output capability and listening distance matter. Watch for: The substantial enclosure and installation requirements make it excessive for many desks.
Buy the Genelec S360. It is rated higher for sound quality than the Devialet Phantom Ultimate 108dB and costs less, so the other one has nothing left to offer.
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Specifications Side By Side
| Devialet Phantom Ultimate 108dB | Genelec S360 | |
|---|---|---|
| Price | $7,998 per pair | $9,550 per pair |
| Ranked | #29 of 68 in Large Size Powered Bookshelf Speakers | #20 of 68 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | <21Hz (measured, Erin's Audio Corner) | 39.6Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | <21Hz (measured, Erin's Audio Corner) | 35.6Hz (measured, Audio Science Review) |
| Dimensions | 10"H x 9.7"W x 13.5"D (255 x 246 x 342 mm) | 20.9"H x 14.2"W x 14.2"D (530 x 360 x 360 mm) |
| Weight | 24.5 lbs (11.1 kg) each | 66.1 lbs (30 kg) each |
| Drivers | Aluminum tweeter, aluminum midrange, two opposed aluminum woofers | 1" titanium compression tweeter, 10" cone woofer |
| Inputs | Wi-Fi, Ethernet, Bluetooth, Optical | XLR (analog), XLR AES/EBU (digital) |
| App | Yes (Devialet) | - |
| Bluetooth | Yes (5.3 with SBC, AAC) | No |
| 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 | 350W total (250W woofer, 100W tweeter, Class D) |
| Maximum SPL | 108dB (manufacturer specified) | Peak 128dB (manufacturer specified) |
| Frequency Response | 14Hz - 35kHz (Manufacturer specified) | 36Hz-22kHz -6dB |
| Spinorama Preference Score | 6.73 | 5.96 |
| Spinorama Preference Score with Perfect Sub | 7.38 | 7.70 |
| 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 | Yes |
| Aux Input | No | No |
| Enclosure | - | ported |
| Warranty | - | 2 years (5 with product registration) |
| Country | - | Finland |
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Prices on this page were last checked September 23, 2026 at 11:24 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
Devialet Phantom Ultimate 108dB: $7,998 per pair Amazon B&H Photo Video eBay
Pros: Erin’s measurements show full bass output all the way down to about 20Hz, the lowest frequency measured, which is remarkable from a single cabinet about 34cm deep. The listening window is close to flat, with a -0.04dB per octave tilt and 0.80 smoothness, earning a 6.73 preference score on its own and 7.38 with an ideal subwoofer. Directivity is smooth, so room reflections keep the same tonal balance as the direct sound. Wi-Fi 6 streaming with AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect and Roon Ready, plus Ethernet and optical inputs, makes one unit a complete music system. Measured bass extension of <21Hz (-3dB).
Cons: 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. Stereo means buying two units, which puts a pair well above conventional powered monitors that measure as well. There is no analog input or subwoofer output, and the rounded shape does not sit on a shelf or desk stand like a box speaker.
Full Devialet Phantom Ultimate 108dB review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 1,100W total |
| App | Yes (Devialet) |
| Aux Input | No |
| Bass Extension (-10dB) | <21Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | <21Hz (measured, Erin's Audio Corner) |
| Bluetooth | Yes (5.3 with SBC, AAC) |
| Bluetooth Codecs | SBC, AAC |
| Coaxial Input | No |
| Dimensions | 10"H x 9.7"W x 13.5"D (255 x 246 x 342 mm) |
| Drivers | Aluminum tweeter, aluminum midrange, two opposed aluminum woofers |
| Frequency Response | 14Hz - 35kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | Wi-Fi, Ethernet, Bluetooth, Optical |
| Maximum SPL | 108dB (manufacturer specified) |
| Optical Input | Yes |
| RCA Input | No |
| Spinorama Preference Score | 6.73 |
| Spinorama Preference Score with Perfect Sub | 7.38 |
| Streaming Services | Yes (AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect, Roon Ready, UPnP) |
| Subwoofer Output | No |
| TRS Input | No |
| USB Input | No |
| Weight | 24.5 lbs (11.1 kg) each |
| Wi-Fi | Yes (Wi-Fi 6, dual-band) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Genelec S360: $9,550 per pair B&H Photo Video eBay
Pros: A strong choice when professional output capability and listening distance matter. The measured 2.0dB response span from 300Hz to 5kHz, 39.6Hz -3dB extension and 7.70 ideal-subwoofer score support balanced sound, while GLM provides room-integration tools. Measured bass extension of 39.6Hz (-3dB).
Cons: The substantial enclosure and installation requirements make it excessive for many desks. Its tonal measurements do not surpass the best smaller monitors simply because it can play louder. Deep-bass reproduction still benefits from a subwoofer, especially in high-output systems.
Full Genelec S360 review and specifications →
| AES Input | Yes |
|---|---|
| Amplifier Power | 350W total (250W woofer, 100W tweeter, Class D) |
| Aux Input | No |
| Bass Extension (-10dB) | 35.6Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 39.6Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| Country | Finland |
| Dimensions | 20.9"H x 14.2"W x 14.2"D (530 x 360 x 360 mm) |
| Drivers | 1" titanium compression tweeter, 10" cone woofer |
| Enclosure | ported |
| Frequency Response | 36Hz-22kHz -6dB |
| HDMI Input | No |
| Inputs | XLR (analog), XLR AES/EBU (digital) |
| Maximum SPL | Peak 128dB (manufacturer specified) |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.96 |
| Spinorama Preference Score with Perfect Sub | 7.70 |
| TRS Input | No |
| USB Input | No |
| Warranty | 2 years (5 with product registration) |
| Weight | 66.1 lbs (30 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons