Short answer: the KEF LSX II LT. It ranks #27 of 58 powered bookshelf speakers by sound quality at $600; the Dynaudio LYD 5 ranks #45 and costs $1000, so there is not much of a tradeoff to weigh.
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 Dynaudio LYD 5 offers: CEA2034 spinorama shows a generally flat on-axis response with well-controlled low-frequency distortion. Early reflections summation is smart engineering the reviewer called “pretty clever.” 100W total Class D amplification across a 5” woofer and 1” tweeter. Watch for: A dip shows up around 1.64kHz on-axis, and the upper bass is boosted to compensate for a lack of real deep bass extension, giving a mild tubbiness. Treble energy runs a bit hot, and the woofer beams around 4kHz, creating a directivity error there. Bass distortion exceeds acceptable levels above 1kHz at higher volumes. The reviewer said he’d personally reach for a JBL 305P MKII or Neumann KH80 DSP instead at this price.
Buy the KEF LSX II LT. It ranks higher for sound quality than the Dynaudio LYD 5 and costs less, so there is no real case for the other one.
If sound quality matters at all to you, skip the Dynaudio LYD 5. It ranks near the bottom of the 58 powered bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| KEF LSX II LT | Dynaudio LYD 5 | |
|---|---|---|
| Price | $600.00 | $1000 |
| Ranked | #27 of 58 in Medium Size Powered Bookshelf Speakers | #45 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) | 10.2"H x 6.7"W x 8.3"D (260 x 170 x 211 mm) |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | - |
| Outputs | RCA Subwoofer | - |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | 5" woofer, 28mm soft dome tweeter |
| Weight | 15 lbs / 6.8 kg | 11.9 lbs / 5.4 kg each |
| App | No | No |
| Bluetooth | No | - |
| EQ | No | No |
| Output Power | 100w RMS Per Speaker | 100W total (50W LF, 50W HF) |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | 68Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | 50Hz (measured, Audio Science Review) |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Frequency Response | - | 50Hz - 21kHz (Manufacturer specified) |
| DSP | - | No |
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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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Dynaudio LYD 5: $1000 Bhphotovideo eBay
Pros: CEA2034 spinorama shows a generally flat on-axis response with well-controlled low-frequency distortion. Early reflections summation is smart engineering the reviewer called “pretty clever.” 100W total Class D amplification across a 5” woofer and 1” tweeter.
Cons: A dip shows up around 1.64kHz on-axis, and the upper bass is boosted to compensate for a lack of real deep bass extension, giving a mild tubbiness. Treble energy runs a bit hot, and the woofer beams around 4kHz, creating a directivity error there. Bass distortion exceeds acceptable levels above 1kHz at higher volumes. The reviewer said he’d personally reach for a JBL 305P MKII or Neumann KH80 DSP instead at this price.
Full Dynaudio LYD 5 review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 50Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 68Hz (measured, Audio Science Review) |
| DSP | No |
| Dimensions | 10.2"H x 6.7"W x 8.3"D (260 x 170 x 211 mm) |
| Drivers | 5" woofer, 28mm soft dome tweeter |
| EQ | No |
| Frequency Response | 50Hz - 21kHz (Manufacturer specified) |
| Output Power | 100W total (50W LF, 50W HF) |
| Weight | 11.9 lbs / 5.4 kg each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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