Short answer: the KEF LSX II LT for better sound quality, the Fluid Audio FX50 V2 for the lower price. The KEF LSX II LT ranks #27 of 64 powered bookshelf speakers at $469.99. The Fluid Audio FX50 V2 ranks #58 at $149, $320.99 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 Fluid Audio FX50 V2 offers: Current 90W coaxial monitor with DSP boundary controls, balanced inputs, front port and wall/ceiling mounting points. The point-source geometry gives symmetrical radiation and flexible vertical or horizontal placement. Watch for: The local Spinorama snapshot is weak at 0.92 raw and 3.53 with a subwoofer despite 58Hz extension, indicating substantial tonal problems. It is better suited to correction-heavy or immersive monitoring than neutral plug-and-play listening.
Buy the KEF LSX II LT if sound quality matters more than the price. Buy the Fluid Audio FX50 V2 if the price matters more than sound quality.
If sound quality matters at all to you, skip the Fluid Audio FX50 V2. It ranks near the bottom of the 64 powered bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| KEF LSX II LT | Fluid Audio FX50 V2 | |
|---|---|---|
| Price | $469.99 | $149 each |
| Ranked | #27 of 64 in Medium Size Powered Bookshelf Speakers | #58 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) | 9.2H x 6.9W x 9.1D in |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | XLR/TRS and RCA |
| Outputs | RCA Subwoofer | - |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | 1-inch silk tweeter coaxially mounted in 5-inch paper woofer |
| Weight | 15 lbs / 6.8 kg | 8.37 lbs each |
| 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 | - | Active coaxial, front-ported |
| Frequency Response | - | 49Hz-22kHz +/-2dB |
| Power Output | - | 90W each |
| Maximum SPL | - | 110dB |
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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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- KEF LSX II LT vs KRK Classic 5
- KEF LSX II LT vs Sigberg Audio SBS Gen 2
- KEF LSX II LT vs Edifier MR4
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Fluid Audio FX50 V2: $149 each Fluid Audio eBay
Pros: Current 90W coaxial monitor with DSP boundary controls, balanced inputs, front port and wall/ceiling mounting points. The point-source geometry gives symmetrical radiation and flexible vertical or horizontal placement.
Cons: The local Spinorama snapshot is weak at 0.92 raw and 3.53 with a subwoofer despite 58Hz extension, indicating substantial tonal problems. It is better suited to correction-heavy or immersive monitoring than neutral plug-and-play listening.
Full Fluid Audio FX50 V2 review and specifications →
| Dimensions | 9.2H x 6.9W x 9.1D in |
|---|---|
| Drivers | 1-inch silk tweeter coaxially mounted in 5-inch paper woofer |
| Enclosure | Active coaxial, front-ported |
| Frequency Response | 49Hz-22kHz +/-2dB |
| Inputs | XLR/TRS and RCA |
| Maximum SPL | 110dB |
| Power Output | 90W each |
| Weight | 8.37 lbs each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Fluid Audio FX50 V2 vs Edifier R1280DB
- Fluid Audio FX50 V2 vs KRK Classic 5
- Fluid Audio FX50 V2 vs Edifier S2000MKIII
- Fluid Audio FX50 V2 vs IK Multimedia iLoud MTM MKII
- Fluid Audio FX50 V2 vs Yamaha HS5
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