Short answer: the Sigberg Audio SBS Gen 2 for better sound quality, the KEF LSX II LT for the lower price. The Sigberg Audio SBS Gen 2 ranks #23 of 100 powered bookshelf speakers, rated 4.2/5, at $18,043.20. The KEF LSX II LT ranks #35, rated 4.0/5, at $699.99, $17,343.21 cheaper.
Why pick the KEF LSX II LT: The coincident driver provides useful consistency across listening positions, and the app offers placement and subwoofer adjustments. The tradeoff: The 3.4dB midrange response span and treble-region dips keep it below more neutral monitors.
The Sigberg Audio SBS Gen 2 is the more accurate, deeper-bass option. The measured speaker-and-subwoofer system has a 1.7dB midrange response span and a 7.51 ideal-subwoofer preference score, supporting useful tonal accuracy above the bass region. Its measured preference score, a predictor of how neutral it sounds, is 6.56 against 4.81 for the KEF LSX II LT. Its bass reaches about 24Hz before falling 3dB, against 55Hz for the KEF LSX II LT. It has an adjustable EQ, which the KEF LSX II LT lacks. Watch for: The measured system explicitly includes a subwoofer: its 6.56 full-system score and bass extension must not be attributed to the bookshelf speaker alone.
Buy the KEF LSX II LT when the price outweighs sound quality for you, and the Sigberg Audio SBS Gen 2 when sound quality outweighs the price instead.
Want more options? Browse the full Powered Home rankings.
Specifications Side By Side
| KEF LSX II LT | Sigberg Audio SBS Gen 2 | |
|---|---|---|
| Price | $699.99 per pair | $18,043.20 for the full system (2 speakers + 2 dedicated subwoofers, built to order) |
| Ranked | #35 of 100 in Medium Size Powered Bookshelf Speakers | #23 of 100 in Medium Size Powered Bookshelf Speakers |
| Dimensions | 9.5”H x 6.1”W x 7.1”D (241.3 x 154.9 x 180.3 mm) | 16.1”H x 7.5”W x 9.1”D (410 x 190 x 230 mm) |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | XLR, RCA, Optical, Coaxial/SPDIF, AES |
| Outputs | RCA Subwoofer | - |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | 5.5” midbass, 5.5” coaxial mid/tweeter with 1” silk dome |
| Weight | 15 lbs (6.8 kg) | 20.9 lbs (9.5 kg) each |
| App | No | No |
| Bluetooth | Yes | No |
| EQ | No | Yes (9-band parametric, factory presets) |
| Amplifier Power | 100w RMS Per Speaker | 350W per speaker |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | 24Hz (measured, spinorama.org, with companion subwoofer) |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | - |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Spinorama Preference Score | 4.81 | 6.56 |
| Spinorama Preference Score with Perfect Sub | 7.03 | 7.51 |
| Subwoofer Output | Yes | - |
| XLR Input | No | Yes |
| RCA Input | No | Yes |
| TRS Input | No | No |
| Optical Input | Yes | Yes |
| Coaxial Input | No | Yes |
| USB Input | Yes | No |
| HDMI Input | Yes | No |
| AES Input | No | Yes |
| Aux Input | No | No |
| Frequency Response | 54Hz - 28kHz (±3dB) (Manufacturer specified) | 26Hz - 20kHz (±2.5dB, with subwoofers) (Manufacturer specified) |
| Enclosure | - | sealed |
| DSP | - | Yes |
| Country | - | Norway |
| Measurement Source | - | Manufacturer |
| Maximum SPL | - | 116dB (manufacturer specified) |
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Prices on this page were last checked October 9, 2026 at 8:01 AM 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 LSX II LT: $699.99 per pair Amazon eBay
Same family: the KEF LSX II (larger bookshelf, estimated 4.1/5), the KEF LS50 Wireless II (larger bookshelf, ranked higher, rated 4.3/5) and the KEF LS60 (floorstanding, rated 4.8/5).
Pros: The coincident driver provides useful consistency across listening positions, and the app offers placement and subwoofer adjustments. Erin’s measurements give preference scores of 4.81 standalone and 7.03 with an ideal subwoofer, with -3dB bass around 56Hz. HDMI and USB connectivity make it convenient for a small TV or desktop system. Horizontal and vertical dispersion both reach about ±60°, giving a broad sweet spot for more than one seat. Measured bass extension of 55Hz (-3dB), with a measured sensitivity of 84dB.
Cons: The 3.4dB midrange response span and treble-region dips keep it below more neutral monitors. The existing review finds bass compression around 88-92dB/1m and rising distortion at higher levels, so the small drivers suit close listening rather than a large room. This LT version has no analog input; a turntable cannot plug straight into it.
Full KEF LSX II LT review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 100w RMS Per Speaker |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) |
| Bluetooth | Yes |
| Coaxial Input | No |
| Dimensions | 9.5”H x 6.1”W x 7.1”D (241.3 x 154.9 x 180.3 mm) |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter |
| EQ | No |
| Frequency Response | 54Hz - 28kHz (±3dB) (Manufacturer specified) |
| HDMI Input | Yes |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth |
| Optical Input | Yes |
| Outputs | RCA Subwoofer |
| RCA Input | No |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.81 |
| Spinorama Preference Score with Perfect Sub | 7.03 |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | Yes |
| Weight | 15 lbs (6.8 kg) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Transform Your Sound System with the KEF LSX II LT Speaker More from Erin’s Audio Corner →
- Erin’s Audio Corner Website: KEF LSX II LT
- Erin’s Audio Corner Measurements (spinorama.org)
- Jasper Tech: Best Desktop Computer Speakers for Every Budget – 2026 More from Jasper Tech →
- Jasper Tech: Best Bookshelf Speakers For TV & Gaming - 2025
- Jasper Tech: Best Powered Bookshelf Speakers for Every Budget - 2025
- Head-to-Head Comparisons
Sigberg Audio SBS Gen 2: $18,043.20 for the full system (2 speakers + 2 dedicated subwoofers, built to order) Sigberg Audio eBay
Older model: the Sigberg Audio SBS.1 (ranked lower, rated 4.1/5).
Pros: The measured speaker-and-subwoofer system has a 1.7dB midrange response span and a 7.51 ideal-subwoofer preference score, supporting useful tonal accuracy above the bass region. The measured system reaches -3dB around 34Hz. Onboard parametric EQ and dedicated amplification provide flexible integration for a complete high-performance setup. Measured bass extension of 24Hz (-3dB).
Cons: The measured system explicitly includes a subwoofer: its 6.56 full-system score and bass extension must not be attributed to the bookshelf speaker alone. It is not directly equivalent to the standalone-monitor tests around it. The complete system is expensive and occupies more space than the main speakers suggest; the score alone does not prove superior output or room performance.
Full Sigberg Audio SBS Gen 2 review and specifications →
| AES Input | Yes |
|---|---|
| Amplifier Power | 350W per speaker |
| App | No |
| Aux Input | No |
| Bass Extension (-3dB) | 24Hz (measured, spinorama.org, with companion subwoofer) |
| Bluetooth | No |
| Coaxial Input | Yes |
| Country | Norway |
| DSP | Yes |
| Dimensions | 16.1”H x 7.5”W x 9.1”D (410 x 190 x 230 mm) |
| Drivers | 5.5” midbass, 5.5” coaxial mid/tweeter with 1” silk dome |
| EQ | Yes (9-band parametric, factory presets) |
| Enclosure | sealed |
| Frequency Response | 26Hz - 20kHz (±2.5dB, with subwoofers) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | XLR, RCA, Optical, Coaxial/SPDIF, AES |
| Maximum SPL | 116dB (manufacturer specified) |
| Measurement Source | Manufacturer |
| Optical Input | Yes |
| RCA Input | Yes |
| Spinorama Preference Score | 6.56 |
| Spinorama Preference Score with Perfect Sub | 7.51 |
| TRS Input | No |
| USB Input | No |
| Weight | 20.9 lbs (9.5 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Sigberg Audio SBS Gen 2 vs IK Multimedia iLoud MTM MKII
- Sigberg Audio SBS Gen 2 vs Kali Audio IN-5
- Sigberg Audio SBS Gen 2 vs JBL 305P MKII
- Sigberg Audio SBS Gen 2 vs Adam Audio T5V
- Sigberg Audio SBS Gen 2 vs Neumann KH80 DSP
- Sigberg Audio SBS Gen 2 vs Kali LP-UNF
- Sigberg Audio SBS Gen 2 vs Yamaha HS5
- Sigberg Audio SBS Gen 2 vs Edifier S2000MKIII
- See all 12 comparisons