Short answer: the KEF LS LUXE. Both are rated 4.4/5 for sound quality (#42 and #41 of 118 powered bookshelf speakers), and the KEF LS LUXE costs $3,999.99 against $7,998 for the Devialet Phantom Ultimate 108dB, so with nothing between them on sound quality, price settles it.
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 KEF LS LUXE: Flagship active wireless bookshelf created with Ross Lovegrove, featuring a 6.5-inch 12th-generation Uni-Q driver array with Metamaterial Absorption Technology (MAT). It keeps a wired aux input, which the Devialet Phantom Ultimate 108dB lacks. The catch: Premium $3,999.99 pricing and a sculptural 44.1 lbs (20 kg) system weight place it well above conventional desktop monitors, and the organic curved enclosure cannot be wall mounted.
Buy the KEF LS LUXE. Both are rated the same for sound quality, and it costs $3,998.01 less than the Devialet Phantom Ultimate 108dB.
About the ratings: the KEF LS LUXE’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 4.2 to 4.6, so this verdict could change once it is measured.
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Specifications Side By Side
| Devialet Phantom Ultimate 108dB | KEF LS LUXE | |
|---|---|---|
| Price | $7,998 per pair | $3,999.99 per pair |
| Ranked | #41 of 118 in Large Size Powered Bookshelf Speakers | #42 of 118 in Large Size Powered Bookshelf Speakers Estimated |
| Bass Extension (-3dB) | <21Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-10dB) | <21Hz (measured, Erin’s Audio Corner) | - |
| Dimensions | 10”H x 9.7”W x 13.5”D (255 x 246 x 342 mm) | 13.2”H x 8.8”W x 11.7”D (336 x 223 x 298 mm) |
| Weight | 24.5 lbs (11.1 kg) each | 44.1 lbs (20.0 kg) |
| Drivers | Aluminum tweeter, aluminum midrange, two opposed aluminum woofers | 1” vented aluminum dome with MAT tweeter, 6.5” aluminum cone woofer |
| Inputs | Wi-Fi, Ethernet, Bluetooth, Optical | - |
| App | Yes (Devialet) | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Bluetooth Codecs | SBC, AAC | - |
| Wi-Fi | Yes (Wi-Fi 6, dual-band) | Yes |
| Streaming Services | Yes (AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect, Roon Ready, UPnP) | - |
| Amplifier Power | 1,100W total | 380W (280W LF + 100W HF) |
| Maximum SPL | 108dB (manufacturer specified) | - |
| Frequency Response | 14Hz - 35kHz (Manufacturer specified) | 42Hz - 28kHz (±3dB) (manufacturer specified) |
| Spinorama Preference Score | 6.73 | - |
| Spinorama Preference Score with Perfect Sub | 7.38 | - |
| Subwoofer Output | No | Yes |
| XLR Input | No | - |
| RCA Input | No | - |
| TRS Input | No | - |
| Optical Input | Yes | Yes |
| Coaxial Input | No | Yes |
| USB Input | No | - |
| HDMI Input | No | Yes |
| AES Input | No | - |
| Aux Input | No | Yes |
| Enclosure | - | ported |
| Ethernet | - | Yes |
| Stereo | - | pair |
| Cabinet Color | - | Dusk Titanium, Eclipse Black, Mineral White |
| Country | - | United Kingdom |
Related Speaker Comparisons
More worthwhile head-to-heads for Devialet Phantom Ultimate 108dB:
- Devialet Phantom Ultimate 108dB vs Pitt & Giblin Flare
- Devialet Phantom Ultimate 108dB vs PSI Audio A21-M
- Devialet Phantom Ultimate 108dB vs Genelec S360
- Devialet Phantom Ultimate 108dB vs SHIVAUDYO Point Zero
- ADAM Audio S3H vs Devialet Phantom Ultimate 108dB
Prices on this page were last checked October 11, 2026 at 4:59 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
Older model: the Devialet Phantom I (ranked lower, rated 4/5). See every Devialet Phantom generation.
Same family: the Devialet Phantom Ultimate 98dB (smaller bookshelf, estimated 4.4/5).
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 →
| Released | Apr 2026 (6 months ago) |
|---|---|
| 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 |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 5.3 |
| 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
- Devialet Phantom Ultimate 108dB vs Kali Audio LP-6 V2
- Devialet Phantom Ultimate 108dB vs O.S. Acoustics DBS8
- Devialet Phantom Ultimate 108dB vs ADAM Audio S3H
- Devialet Phantom Ultimate 108dB vs SHIVAUDYO Point Zero
- Devialet Phantom Ultimate 108dB vs Genelec S360
- Devialet Phantom Ultimate 108dB vs PSI Audio A21-M
- Devialet Phantom Ultimate 108dB vs Meyer Sound Amie
- Devialet Phantom Ultimate 108dB vs Pitt & Giblin Flare
KEF LS LUXE: $3,999.99 per pair Estimated Amazon KEF eBay
Pros: Flagship active wireless bookshelf created with Ross Lovegrove, featuring a 6.5-inch 12th-generation Uni-Q driver array with Metamaterial Absorption Technology (MAT). Bi-amplified with Class D on the woofer and Class AB on the 1-inch vented aluminum dome tweeter. Features KEF Velocity Control Technology (VECO), current-drive amplification, dual-band Wi-Fi (AirPlay 2, Chromecast, Roon Ready), Bluetooth 5.3, HDMI eARC, optical, coaxial, 3.5mm aux, and twin subwoofer outputs with high-pass filtering.
Cons: Premium $3,999.99 pricing and a sculptural 20 kg system weight place it well above conventional desktop monitors, and the organic curved enclosure cannot be wall mounted.
Full KEF LS LUXE review and specifications →
| Amplifier Power | 380W (280W LF + 100W HF) |
|---|---|
| Aux Input | Yes |
| Bluetooth | Yes |
| Bluetooth Version | 5.3 |
| Cabinet Color | Dusk Titanium, Eclipse Black, Mineral White |
| Coaxial Input | Yes |
| Country | United Kingdom |
| Dimensions | 13.2”H x 8.8”W x 11.7”D (336 x 223 x 298 mm) |
| Drivers | 1” vented aluminum dome with MAT tweeter, 6.5” aluminum cone woofer |
| Enclosure | ported |
| Ethernet | Yes |
| Frequency Response | 42Hz - 28kHz (±3dB) (manufacturer specified) |
| HDMI Input | Yes |
| Optical Input | Yes |
| Stereo | pair |
| Subwoofer Output | Yes |
| Weight | 44.1 lbs (20.0 kg) |
| Wi-Fi | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons