Short answer: the KEF LSX II LT if sound quality matters most, the Onkyo GX-30ARC if price matters most. The KEF LSX II LT ranks #35 of 100 powered bookshelf speakers, rated 4.0/5, at $699.99. The Onkyo GX-30ARC ranks #55, rated 3.7/5, at $249, $450.99 cheaper.
The KEF LSX II LT is the more accurate option. The coincident driver provides useful consistency across listening positions, and the app offers placement and subwoofer adjustments. Its measured preference score, a predictor of how neutral it sounds, is 4.81 against 3.69 for the Onkyo GX-30ARC. The tradeoff: The 3.4dB midrange response span and treble-region dips keep it below more neutral monitors.
The case for the Onkyo GX-30ARC: HDMI ARC, USB-C, optical and analog inputs make it a convenient compact system for a desk or TV. It keeps a wired aux input, which the KEF LSX II LT lacks. The catch: The response rises toward the treble by about 0.48dB per octave.
Buy the KEF LSX II LT if sound quality matters more than the price. Buy the Onkyo GX-30ARC if the price matters more than sound quality.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| KEF LSX II LT | Onkyo GX-30ARC | |
|---|---|---|
| Price | $699.99 per pair | $249.00 per pair |
| Ranked | #35 of 100 in Medium Size Powered Bookshelf Speakers | #55 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) | approx. 8.7H x 5.8W x 7.9D in each |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | HDMI ARC, USB-C, optical, phono/line, 3.5mm aux, Bluetooth 5.3 |
| Outputs | RCA Subwoofer | Subwoofer |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | 1” tweeter, 4” woofer |
| Weight | 15 lbs (6.8 kg) | 6.2 lbs (2.8 kg) (primary speaker) |
| App | No | - |
| Bluetooth | Yes | Yes |
| EQ | No | - |
| Amplifier Power | 100w RMS Per Speaker | Class D amplification |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | - |
| 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 | 3.69 |
| Spinorama Preference Score with Perfect Sub | 7.03 | 6.42 |
| Subwoofer Output | Yes | Yes |
| XLR Input | No | No |
| RCA Input | No | No |
| TRS Input | No | No |
| Optical Input | Yes | Yes |
| Coaxial Input | No | No |
| USB Input | Yes | Yes |
| HDMI Input | Yes | Yes |
| AES Input | No | No |
| Aux Input | No | Yes |
| Frequency Response | 54Hz - 28kHz (±3dB) (Manufacturer specified) | 55Hz - 20kHz (Manufacturer specified) |
| Enclosure | - | 2-way powered, rear-ported |
| Country | - | Japan (design) |
| Bluetooth Version | - | 5.3 |
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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
Onkyo GX-30ARC: $249.00 per pair Amazon B&H Photo Video eBay
Pros: HDMI ARC, USB-C, optical and analog inputs make it a convenient compact system for a desk or TV. Erin’s Klippel data gives a 3.69 standalone preference score and 6.42 with an ideal subwoofer. The midrange response spans 3.8dB, offering usable but not reference-level tonal performance.
Cons: The response rises toward the treble by about 0.48dB per octave. Bass reaches -3dB around 74Hz, not the lower LFX value used inside the preference model. Vertical listening position affects crossover balance. Its extensive connectivity does not compensate for response irregularities, and the published tonal data alone does not establish maximum clean output.
Full Onkyo GX-30ARC review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | Class D amplification |
| Aux Input | Yes |
| Bluetooth | Yes |
| Bluetooth Version | 5.3 |
| Coaxial Input | No |
| Country | Japan (design) |
| Dimensions | approx. 8.7H x 5.8W x 7.9D in each |
| Drivers | 1” tweeter, 4” woofer |
| Enclosure | 2-way powered, rear-ported |
| Frequency Response | 55Hz - 20kHz (Manufacturer specified) |
| HDMI Input | Yes |
| Inputs | HDMI ARC, USB-C, optical, phono/line, 3.5mm aux, Bluetooth 5.3 |
| Optical Input | Yes |
| Outputs | Subwoofer |
| RCA Input | No |
| Spinorama Preference Score | 3.69 |
| Spinorama Preference Score with Perfect Sub | 6.42 |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | Yes |
| Weight | 6.2 lbs (2.8 kg) (primary speaker) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons