Short answer: the Airpulse A100 for better sound quality, the KEF LSX II LT for the lower price. The Airpulse A100 ranks #17 of 58 powered bookshelf speakers at $999.99. The KEF LSX II LT ranks #27 at $600, $399.99 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 Airpulse A100 offers: Horn-loaded ribbon tweeter (inherited from Airpulse’s flagship 7001 monitor, designed by Phil Jones) paired with a 5” hard-anodized aluminum cone woofer - a distinctive, low-mass driver combination rarely seen below $1,000. Directivity spread is the widest and most controlled of this batch (directivity_spdi_stddev 4.26). A full input set for a desktop system: RCA, USB, optical, coaxial, and Bluetooth, plus a dedicated subwoofer output and an included IR remote. Watch for: On-axis deviation (aad_on_axis 0.498) trails the pricier options in this group, and there’s no app-based EQ or DSP - bass/treble trim is limited to physical rear-panel knobs not reachable from the remote. The compact 5” woofer caps sub-bass extension at 63.0Hz (-3dB) / 53.2Hz (-10dB), the second-shallowest in this batch, effectively expecting an external subwoofer for full-range use. No Wi-Fi streaming (AirPlay/Chromecast) - Bluetooth only.
Buy the KEF LSX II LT if the price matters more than sound quality. Buy the Airpulse A100 if sound quality matters more than the price.
Specifications Side By Side
| KEF LSX II LT | Airpulse A100 | |
|---|---|---|
| Price | $600.00 | $999.99 |
| Ranked | #27 of 58 in Medium Size Powered Bookshelf Speakers | #17 of 58 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) | 6.3" x 11.1" x 10" (160 x 283 x 255 mm) (6.3 x 11.1 x 10.0 in) each |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | RCA (aux), USB, optical, coaxial, Bluetooth aptX |
| Outputs | RCA Subwoofer | - |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | Horn-loaded ribbon tweeter, 5" hard-anodized aluminum cone woofer |
| Weight | 15 lbs / 6.8 kg | 24.3 lbs / 11 kg (24.2 lb) each |
| App | No | None (physical bass/treble knobs, IR remote) |
| Bluetooth | No | Yes (SBC, aptX) |
| EQ | No | Yes, rear-panel bass/treble trim knobs |
| Output Power | 100w RMS Per Speaker | 100W total (40W+40W woofer, 10W+10W tweeter) |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | 63.0Hz (measured, spinorama.org) |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | 53.2Hz (measured, spinorama.org) |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Frequency Response | - | 52Hz - 40kHz |
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- Genelec 8030C vs KRK Rokit 5 G4
- KEF LSX II LT vs Dynaudio LYD 5
- Edifier S1000W vs Airpulse A100
Prices on this page were last checked August 24, 2026 at 6:53 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: $600.00 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
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Airpulse A100: $999.99 Amazon B&H Photo eBay
Pros: Horn-loaded ribbon tweeter (inherited from Airpulse’s flagship 7001 monitor, designed by Phil Jones) paired with a 5” hard-anodized aluminum cone woofer - a distinctive, low-mass driver combination rarely seen below $1,000. Directivity spread is the widest and most controlled of this batch (directivity_spdi_stddev 4.26). A full input set for a desktop system: RCA, USB, optical, coaxial, and Bluetooth, plus a dedicated subwoofer output and an included IR remote.
Cons: On-axis deviation (aad_on_axis 0.498) trails the pricier options in this group, and there’s no app-based EQ or DSP - bass/treble trim is limited to physical rear-panel knobs not reachable from the remote. The compact 5” woofer caps sub-bass extension at 63.0Hz (-3dB) / 53.2Hz (-10dB), the second-shallowest in this batch, effectively expecting an external subwoofer for full-range use. No Wi-Fi streaming (AirPlay/Chromecast) - Bluetooth only.
Full Airpulse A100 review and specifications →
| App | None (physical bass/treble knobs, IR remote) |
|---|---|
| Bass Extension (-10dB) | 53.2Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 63.0Hz (measured, spinorama.org) |
| Bluetooth | Yes (SBC, aptX) |
| Dimensions | 6.3" x 11.1" x 10" (160 x 283 x 255 mm) (6.3 x 11.1 x 10.0 in) each |
| Drivers | Horn-loaded ribbon tweeter, 5" hard-anodized aluminum cone woofer |
| EQ | Yes, rear-panel bass/treble trim knobs |
| Frequency Response | 52Hz - 40kHz |
| Inputs | RCA (aux), USB, optical, coaxial, Bluetooth aptX |
| Output Power | 100W total (40W+40W woofer, 10W+10W tweeter) |
| Weight | 24.3 lbs / 11 kg (24.2 lb) each |
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- Reviews, Comparisons and Sound Samples
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