Short answer: the KEF LSX II LT for better sound quality, the Dayton Audio M4 for the lower price. The KEF LSX II LT ranks #35 of 100 powered bookshelf speakers, rated 4.0/5, at $549.99. The Dayton Audio M4 ranks #52, rated 3.8/5, at $249.98, $300.01 cheaper.
The KEF LSX II LT is the deeper-bass option. The coincident driver provides useful consistency across listening positions, and the app offers placement and subwoofer adjustments. Its bass reaches about 55Hz before falling 3dB, against 121Hz for the Dayton Audio M4. The tradeoff: The 3.4dB midrange response span and treble-region dips keep it below more neutral monitors.
Why pick the Dayton Audio M4: A compact powered pair with a subwoofer output, useful source connections and a solid cabinet. It keeps a wired aux input, which the KEF LSX II LT lacks. The catch: Existing listening and output notes describe limited bass, a balance that changes with distance, and distortion rising above roughly 93dB.
Buy the KEF LSX II LT if sound quality matters more than the price. Buy the Dayton Audio M4 if the price matters more than sound quality.
Still deciding? The full Powered Home rankings cover every ranked option.
Specifications Side By Side
| KEF LSX II LT | Dayton Audio M4 | |
|---|---|---|
| Price | $549.99 per pair | $249.98 per pair |
| Ranked | #35 of 100 in Medium Size Powered Bookshelf Speakers | #52 of 100 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) | 5” x 6.5” x 9.5” (127 x 165 x 241 mm) (W x D x H) |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | RCA, USB-C, Bluetooth |
| Outputs | RCA Subwoofer | Subwoofer (20Hz-200Hz) |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | 4” aluminum woofer, 1” silk dome tweeter |
| Weight | 15 lbs (6.8 kg) | 6.2 lbs (2.81 kg) (active), 5.1 lbs (2.31 kg) (passive) |
| App | No | No |
| Bluetooth | Yes | Yes |
| EQ | No | - |
| Amplifier Power | 100w RMS Per Speaker | 75W RMS (150W peak) |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | 121Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | 60Hz (measured, Erin’s Audio Corner) |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Spinorama Preference Score | 4.81 | - |
| Spinorama Preference Score with Perfect Sub | 7.03 | - |
| Subwoofer Output | Yes | Yes |
| XLR Input | No | No |
| RCA Input | No | Yes |
| TRS Input | No | No |
| Optical Input | Yes | No |
| Coaxial Input | No | No |
| USB Input | Yes | Yes |
| HDMI Input | Yes | No |
| AES Input | No | No |
| Aux Input | No | Yes (RCA) |
| Frequency Response | 54Hz - 28kHz (±3dB) (Manufacturer specified) | 40Hz - 20kHz (Manufacturer specified) |
| Bluetooth Version | - | 5.0 |
| Bluetooth Codecs | - | SBC, aptX |
| Digital Aux Input | - | Yes (USB-C DAC, up to 192kHz/32-bit) |
| Stereo | - | Yes |
| Power Input | - | AC Power cord |
Related Speaker Comparisons
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- KEF LSX II LT vs Neumann KH120 MKII
- Genelec 8030C vs KEF LSX II LT
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- KEF LSX II LT vs Reflector Audio Square Two
Prices on this page were last checked October 7, 2026 at 9:25 PM 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: $549.99 per pair Amazon eBay
Same family: the KEF LSX II (larger bookshelf, estimated 4.1/5), the KEF LS50 Wireless II (larger bookshelf, ranked higher, rated 4.3/5) and the KEF LS60 (floorstanding, rated 4.8/5).
Pros: The coincident driver provides useful consistency across listening positions, and the app offers placement and subwoofer adjustments. Erin’s measurements give preference scores of 4.81 standalone and 7.03 with an ideal subwoofer, with -3dB bass around 56Hz. HDMI and USB connectivity make it convenient for a small TV or desktop system. Horizontal and vertical dispersion both reach about ±60°, giving a broad sweet spot for more than one seat. Measured bass extension of 55Hz (-3dB), with a measured sensitivity of 84dB.
Cons: The 3.4dB midrange response span and treble-region dips keep it below more neutral monitors. The existing review finds bass compression around 88-92dB/1m and rising distortion at higher levels, so the small drivers suit close listening rather than a large room. This LT version has no analog input; a turntable cannot plug straight into it.
Full KEF LSX II LT review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 100w RMS Per Speaker |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) |
| Bluetooth | Yes |
| Coaxial Input | 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 |
| Frequency Response | 54Hz - 28kHz (±3dB) (Manufacturer specified) |
| HDMI Input | Yes |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth |
| Optical Input | Yes |
| Outputs | RCA Subwoofer |
| RCA Input | No |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.81 |
| Spinorama Preference Score with Perfect Sub | 7.03 |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | Yes |
| Weight | 15 lbs (6.8 kg) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Transform Your Sound System with the KEF LSX II LT Speaker More from Erin’s Audio Corner →
- Erin’s Audio Corner Website: KEF LSX II LT
- Erin’s Audio Corner Measurements (spinorama.org)
- Jasper Tech: Best Desktop Computer Speakers for Every Budget – 2026 More from Jasper Tech →
- Jasper Tech: Best Bookshelf Speakers For TV & Gaming - 2025
- Jasper Tech: Best Powered Bookshelf Speakers for Every Budget - 2025
- Head-to-Head Comparisons
Dayton Audio M4: $249.98 per pair Parts Express eBay
Pros: A compact powered pair with a subwoofer output, useful source connections and a solid cabinet. The existing review describes reasonable linearity for the price and a subdued upper treble that avoids an aggressively bright presentation. It is best considered for a close desktop setup. Measured bass extension of 121Hz (-3dB).
Cons: Existing listening and output notes describe limited bass, a balance that changes with distance, and distortion rising above roughly 93dB. The soft treble is a tonal preference, not evidence of reference neutrality; a subwoofer does not establish greater midrange headroom.
Full Dayton Audio M4 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 75W RMS (150W peak) |
| App | No |
| Aux Input | Yes (RCA) |
| Bass Extension (-10dB) | 60Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 121Hz (measured, Erin’s Audio Corner) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, aptX |
| Bluetooth Version | 5.0 |
| Coaxial Input | No |
| Digital Aux Input | Yes (USB-C DAC, up to 192kHz/32-bit) |
| Dimensions | 5” x 6.5” x 9.5” (127 x 165 x 241 mm) (W x D x H) |
| Drivers | 4” aluminum woofer, 1” silk dome tweeter |
| Frequency Response | 40Hz - 20kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | RCA, USB-C, Bluetooth |
| Optical Input | No |
| Outputs | Subwoofer (20Hz-200Hz) |
| Power Input | AC Power cord |
| RCA Input | Yes |
| Stereo | Yes |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | Yes |
| Weight | 6.2 lbs (2.81 kg) (active), 5.1 lbs (2.31 kg) (passive) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons