Short answer: the KEF LSX II LT for better sound quality, the KRK Classic 5 for the lower price. The KEF LSX II LT ranks #20 of 42 powered bookshelf speakers at $600. The KRK Classic 5 ranks #22 at $280, $320 cheaper.
What the KEF LSX II LT gets right: 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 catch: 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.
On the KRK Classic 5 side: Good soundstage. Set against that: More hifi than studio monitors.
Buy the KEF LSX II LT if sound quality matters more than the price. Buy the KRK Classic 5 if the price matters more than sound quality.
Specifications Side By Side
| KEF LSX II LT | KRK Classic 5 | |
|---|---|---|
| Price | $600.00 | $280 |
| Ranked | #20 of 42 in Medium Size Powered Bookshelf Speakers | #22 of 42 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) | 9.7"H x 7.4"W x 11.2"D (246.4 x 188 x 284.5 mm) |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | RCA, TRS, XLR |
| Outputs | RCA Subwoofer | - |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | 5" (127mm) woofer |
| Weight | 15 lbs / 6.8 kg | 12.9 lbs / 5.87 kg |
| App | No | No |
| Bluetooth | No | No |
| EQ | No | Yes (Room adjustment) |
| Output Power | 100w RMS Per Speaker | 50w RMS Per Speaker |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | 80Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | 62Hz (measured, Audio Science Review) |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Frequency Response | - | 56Hz-30KHz (+-3dB) (Manufacturer specified) |
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The Two Speakers In Full
KEF LSX II LT: $600.00 Amazon
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 |
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- Links
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KRK Classic 5: $280 Amazon
Pros: Good soundstage
Cons: More hifi than studio monitors. Elevated, splashy highs above 4kHz stem from port/woofer resonance glitches, plus directivity error at the crossover dips the upper midrange. Distortion exceeds 100% below 50Hz, and the lack of a waveguide narrows the tweeter’s beam sharply, so toe-in and listening position matter a lot. Not recommended out of the box, but the reviewer said EQ correction turns it into a capable, high-power monitor.
Full KRK Classic 5 review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 62Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 80Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Dimensions | 9.7"H x 7.4"W x 11.2"D (246.4 x 188 x 284.5 mm) |
| Drivers | 5" (127mm) woofer |
| EQ | Yes (Room adjustment) |
| Frequency Response | 56Hz-30KHz (+-3dB) (Manufacturer specified) |
| Inputs | RCA, TRS, XLR |
| Output Power | 50w RMS Per Speaker |
| Weight | 12.9 lbs / 5.87 kg |
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