Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The KEF LS60 ranks #2 of 14 powered floorstanding speakers by sound quality at $5,999.99; the Devialet Phantom I ranks #83 of 118 powered bookshelf speakers by sound quality at $4,800.
The KEF LS60 is the more accurate choice. Erin’s on-axis measurement combines a 1.9dB response span from 300Hz to 5kHz with a 7.91 ideal-subwoofer preference score, supporting even vocal and instrumental balance. Its measured preference score, a predictor of how neutral it sounds, is 7.26 against 5.76 for the Devialet Phantom I. The tradeoff: A diffraction dip around 9kHz can soften cymbal shimmer when aimed directly at the listener; 10-20 degrees of toe-out helps.
The case for the Devialet Phantom I: Devialet’s spherical all-in-one wireless speaker with opposed woofers and a coaxial mid and tweeter. The tradeoff: The measurements are Devialet’s own and stop at about 22Hz, so the true bass extension is not shown.
One note: the Devialet Phantom I is no longer in production and isn’t widely stocked new anymore. The Devialet Phantom I’s replacement, the Devialet Phantom Ultimate 108dB, is still sold new.
Buy the KEF LS60 at $5,999.99 for a powered floorstanding speaker, or the Devialet Phantom I at $4,800 for a powered bookshelf speaker instead.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| KEF LS60 | Devialet Phantom I | |
|---|---|---|
| Price | $5,999.99 per pair | $4,800 per pair Discontinued |
| Ranked | #2 of 14 in Large Size Powered Floorstanding Speakers | #83 of 118 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-10dB) | <20Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 23Hz (measured, Erin’s Audio Corner) | - |
| Dimensions | 42.9”H x 8.3”W x 15.5”D (1089.7 x 210.8 x 393.7 mm) | 10”H x 9.9”W x 13.5”D (255 x 252 x 342 mm) |
| Inputs | Wifi, Optical, Digital coaxial, RCA, HDMI eARC, Ethernet | - |
| Drivers | 4 x 135 mm (5.25 in.) Uni-Core Force Cancelling Driver: woofers, 100 mm (4in.) aluminium cone midrange, 19 mm (0.75 in.) vented aluminium dome with Metamaterial Absorption Technology tweeter | Coaxial aluminium tweeter and midrange, 2x opposed woofers |
| Weight | 69 lbs (31.3 kg) each | 25.1 lbs (11.4 kg) each |
| App | Yes (KEF Connect) | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.0 | - |
| Bluetooth Codecs | SBC, AAC | - |
| DSP | Yes (Music Integrity Engine) | - |
| EQ | Yes (Normal and Expert modes, room adaptation) | - |
| Frequency Response | 31Hz - 24kHz (±3dB) (Manufacturer specified) | - |
| Outputs | Subwoofer RCA | - |
| Streaming Services | Yes (AirPlay 2, Chromecast, Roon Ready, Spotify Connect, Tidal Connect, Amazon Music, Qobuz, Deezer) | - |
| Wi-Fi | Yes (dual-band) | - |
| Amplifier Power | 700W (500W LF Class D + 100W MF Class D + 100W HF Class AB) | - |
| Sensitivity | 97.7dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Maximum SPL | 111dB @ 1m (pink noise) (manufacturer specified) | - |
| Spinorama Preference Score | 7.26 | 5.76 |
| Spinorama Preference Score with Perfect Sub | 7.91 | 6.57 |
| Subwoofer Output | Yes | - |
| XLR Input | No | No |
| RCA Input | Yes | No |
| TRS Input | No | No |
| Optical Input | Yes | Yes |
| Coaxial Input | Yes | No |
| USB Input | No | No |
| HDMI Input | Yes | No |
| AES Input | No | No |
| Aux Input | No | No |
| DIY Kit | - | No |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared. The two were measured by different sources, so small differences, especially in the bass, can come from the measurement setup rather than the speakers.
Measurement data: KEF LS60 (measured by Erin’s Audio Corner) and Devialet Phantom I (measured by the manufacturer), via spinorama.org.
Related Speaker Comparisons
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- KEF LS60 vs B&O Beolab20
- KEF LS LUXE vs Devialet Phantom I
- Dutch & Dutch 8C vs ADAM Audio A7V
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
KEF LS60: $5,999.99 per pair Amazon Crutchfield eBay
Same family: the KEF LSX II LT (smallest bookshelf, rated 4/5), the KEF LSX II (bookshelf, estimated 4.1/5) and the KEF LS50 Wireless II (largest bookshelf, rated 4.3/5).
Pros: Erin’s on-axis measurement combines a 1.9dB response span from 300Hz to 5kHz with a 7.91 ideal-subwoofer preference score, supporting even vocal and instrumental balance. Extended-mode bass reaches roughly 25Hz at -3dB. The coaxial Uni-Q arrangement maintains unusually consistent tonality across listening positions, while HDMI, digital and analog inputs plus network streaming make this a convenient complete music and TV system. Measured bass extension of 23Hz (-3dB), with a measured sensitivity of 97.7dB.
Cons: A diffraction dip around 9kHz can soften cymbal shimmer when aimed directly at the listener; 10-20 degrees of toe-out helps. DSP limiting reduces bass reach and dynamic output at high volume, so its deep low-level extension is not a promise of the same performance on loud peaks. App placement and tone controls are less flexible than parametric room correction. Each roughly 31kg tower is awkward to move.
Full KEF LS60 review and specifications →
| Released | Jun 2022 (4 years ago) |
|---|---|
| AES Input | No |
| Amplifier Power | 700W (500W LF Class D + 100W MF Class D + 100W HF Class AB) |
| App | Yes (KEF Connect) |
| Aux Input | No |
| Bass Extension (-10dB) | <20Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 23Hz (measured, Erin’s Audio Corner) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 5.0 |
| Coaxial Input | Yes |
| DSP | Yes (Music Integrity Engine) |
| Dimensions | 42.9”H x 8.3”W x 15.5”D (1089.7 x 210.8 x 393.7 mm) |
| Drivers | 4 x 135 mm (5.25 in.) Uni-Core Force Cancelling Driver: woofers, 100 mm (4in.) aluminium cone midrange, 19 mm (0.75 in.) vented aluminium dome with Metamaterial Absorption Technology tweeter |
| EQ | Yes (Normal and Expert modes, room adaptation) |
| Frequency Response | 31Hz - 24kHz (±3dB) (Manufacturer specified) |
| HDMI Input | Yes |
| Inputs | Wifi, Optical, Digital coaxial, RCA, HDMI eARC, Ethernet |
| Maximum SPL | 111dB @ 1m (pink noise) (manufacturer specified) |
| Optical Input | Yes |
| Outputs | Subwoofer RCA |
| RCA Input | Yes |
| Sensitivity | 97.7dB (measured at 0.3V/1m, Erin’s Audio Corner) |
| Spinorama Preference Score | 7.26 |
| Spinorama Preference Score with Perfect Sub | 7.91 |
| Streaming Services | Yes (AirPlay 2, Chromecast, Roon Ready, Spotify Connect, Tidal Connect, Amazon Music, Qobuz, Deezer) |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | No |
| Weight | 69 lbs (31.3 kg) each |
| Wi-Fi | Yes (dual-band) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Devialet Phantom I: $4,800 per pair Discontinued eBay
Newer model: the Devialet Phantom Ultimate 108dB, ranked higher, rated 4.4/5, released Apr 2026. See every Devialet Phantom generation.
Pros: Devialet’s spherical all-in-one wireless speaker with opposed woofers and a coaxial mid and tweeter. Devialet’s measurements show bass holding up to the lowest frequency in the data (about 22Hz) and a preference score of 5.76 without a subwoofer, with consistent directivity (2.86dB directivity index deviation).
Cons: The measurements are Devialet’s own and stop at about 22Hz, so the true bass extension is not shown. The listening window spans 4.5dB from 300Hz to 5kHz. Replaced by the Phantom Ultimate. Discontinued.
Full Devialet Phantom I review and specifications →
| Released | Feb 2021 (5 years ago) |
|---|---|
| AES Input | No |
| Aux Input | No |
| Bluetooth | Yes |
| Coaxial Input | No |
| DIY Kit | No |
| Dimensions | 10”H x 9.9”W x 13.5”D (255 x 252 x 342 mm) |
| Drivers | Coaxial aluminium tweeter and midrange, 2x opposed woofers |
| HDMI Input | No |
| Optical Input | Yes |
| RCA Input | No |
| Spinorama Preference Score | 5.76 |
| Spinorama Preference Score with Perfect Sub | 6.57 |
| TRS Input | No |
| USB Input | No |
| Weight | 25.1 lbs (11.4 kg) each |
| XLR Input | No |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons