Short answer: the KEF LSX II LT for better sound quality, the Onkyo GX-30ARC for the lower price. The KEF LSX II LT ranks #27 of 64 powered bookshelf speakers at $469.99. The Onkyo GX-30ARC ranks #43 at $349, $120.99 cheaper.
What the KEF LSX II LT offers: Coaxial (Uni-Q-style) driver keeps the tweeter centered in the midrange, giving wide and consistent dispersion both horizontally and vertically (about ±60° each) - a wide sweet spot for multiple seats or positions. The KEF Connect app provides genuinely useful DSP control: desk/wall boundary compensation, adjustable bass contour (standard/less/extra), treble trim, and subwoofer integration, letting you tune the sound to wherever it’s placed. Distortion at a moderate 86dB looks good for the speaker’s compact size. Tonal profile stays consistent from 0° to 30° off-axis, so side-seat listeners hear essentially the same balance as someone centered. Extensive connectivity for its size: HDMI, USB, optical, sub output, plus Wi-Fi/Bluetooth. Clearly outperformed the reviewer’s soundbars, including ones bundled with their own subwoofers, as a TV audio replacement. Watch for: Small drivers mean it’s SPL-limited: bass compression kicks in around 88-92dB/1m per speaker, and multitone distortion crosses the reviewer’s 3% threshold around 96dB - not intended for loud or large-room duty. F3 of 55Hz and F10 of 46Hz mean it loses much of its bass by around 50Hz; a subwoofer (controllable through the same app) is needed for real low end. Diffraction dips appear around 4-5kHz and again near 8kHz, likely tied to the tweeter housing or surround, giving a mild reduction in treble attack and sibilance. A possible port or enclosure resonance shows up around 800Hz in the rear-radiation measurements, though the reviewer wasn’t certain of the exact cause or whether it’s audible. No analog input on this LT variant, so a turntable can’t be connected directly - only the pricier standard LSX II model includes one.
What the Onkyo GX-30ARC offers: A compact powered pair with unusually complete connectivity: HDMI ARC, USB-C, optical, phono/line, aux and Bluetooth 5.3. Erin’s data predicts a 5.55 score with a subwoofer, low 0.091 on-axis roughness and useful 62Hz in-room extension. Watch for: The response rises about +0.48dB per octave and narrows vertically, while directivity-index consistency is a mediocre 3.84. Its 0.232 sound-power smoothness suggests some room-response unevenness, and low bass still benefits from a subwoofer.
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.
Specifications Side By Side
| KEF LSX II LT | Onkyo GX-30ARC | |
|---|---|---|
| Price | $469.99 | $349/pair |
| Ranked | #27 of 64 in Medium Size Powered Bookshelf Speakers | #43 of 64 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 | - |
| App | No | - |
| Bluetooth | No | - |
| EQ | No | - |
| Output Power | 100w RMS Per Speaker | - |
| 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) | - |
| Enclosure | - | 2-way powered, rear-ported |
| Power Output | - | Class D amplification |
| Country | - | Japan (design) |
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Prices on this page were last checked August 25, 2026 at 6:19 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: $469.99 Amazon eBay
Pros: Coaxial (Uni-Q-style) driver keeps the tweeter centered in the midrange, giving wide and consistent dispersion both horizontally and vertically (about ±60° each) - a wide sweet spot for multiple seats or positions. The KEF Connect app provides genuinely useful DSP control: desk/wall boundary compensation, adjustable bass contour (standard/less/extra), treble trim, and subwoofer integration, letting you tune the sound to wherever it’s placed. Distortion at a moderate 86dB looks good for the speaker’s compact size. Tonal profile stays consistent from 0° to 30° off-axis, so side-seat listeners hear essentially the same balance as someone centered. Extensive connectivity for its size: HDMI, USB, optical, sub output, plus Wi-Fi/Bluetooth. Clearly outperformed the reviewer’s soundbars, including ones bundled with their own subwoofers, as a TV audio replacement.
Cons: Small drivers mean it’s SPL-limited: bass compression kicks in around 88-92dB/1m per speaker, and multitone distortion crosses the reviewer’s 3% threshold around 96dB - not intended for loud or large-room duty. F3 of 55Hz and F10 of 46Hz mean it loses much of its bass by around 50Hz; a subwoofer (controllable through the same app) is needed for real low end. Diffraction dips appear around 4-5kHz and again near 8kHz, likely tied to the tweeter housing or surround, giving a mild reduction in treble attack and sibilance. A possible port or enclosure resonance shows up around 800Hz in the rear-radiation measurements, though the reviewer wasn’t certain of the exact cause or whether it’s audible. No analog input on this LT variant, so a turntable can’t be connected directly - only the pricier standard LSX II model includes one.
Full KEF LSX II LT review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 46Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 55Hz (measured, Erin's Audio Corner) |
| Bluetooth | 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 |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth |
| Output Power | 100w RMS Per Speaker |
| Outputs | RCA Subwoofer |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin's Audio Corner) |
| Weight | 15 lbs / 6.8 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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Onkyo GX-30ARC: $349/pair Onkyo eBay
Pros: A compact powered pair with unusually complete connectivity: HDMI ARC, USB-C, optical, phono/line, aux and Bluetooth 5.3. Erin’s data predicts a 5.55 score with a subwoofer, low 0.091 on-axis roughness and useful 62Hz in-room extension.
Cons: The response rises about +0.48dB per octave and narrows vertically, while directivity-index consistency is a mediocre 3.84. Its 0.232 sound-power smoothness suggests some room-response unevenness, and low bass still benefits from a subwoofer.
Full Onkyo GX-30ARC review and specifications →
| 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 |
| Inputs | HDMI ARC, USB-C, optical, phono/line, 3.5mm aux, Bluetooth 5.3 |
| Outputs | Subwoofer |
| Power Output | Class D amplification |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Onkyo GX-30ARC vs Edifier R1280DB
- Onkyo GX-30ARC vs KRK Classic 5
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