Short answer: the KEF LS50 Wireless II if sound quality matters most, the M-Audio BX4 D3 if price matters most. The KEF LS50 Wireless II ranks #14 of 76 powered bookshelf speakers, rated 4.3/5, at $2,999.99. The M-Audio BX4 D3 ranks #57, rated 3.4/5, at $149, $2,850.99 cheaper.
The KEF LS50 Wireless II is the more accurate option. Erin’s measurements give preference scores of 5.43 standalone and 7.51 with an ideal subwoofer, with a -3dB point around 51Hz. Its measured preference score, a predictor of how neutral it sounds, is 5.43 against 3.29 for the M-Audio BX4 D3. Watch for: The 3.0dB response span is good but not reference-leading, and dispersion still varies with frequency.
The case for the M-Audio BX4 D3: Balanced TRS, RCA and front auxiliary/headphone connections, plus tone controls, make this a flexible inexpensive desktop pair. The catch: A rising response of about 0.62dB per octave and listening-window deviation of 0.546 indicate bright, locally uneven reproduction.
Buy the KEF LS50 Wireless II if sound quality is the priority over the price, or the M-Audio BX4 D3 if the price is the priority over sound quality.
Still deciding? The full Powered Home rankings cover every ranked option.
Specifications Side By Side
| KEF LS50 Wireless II | M-Audio BX4 D3 | |
|---|---|---|
| Price | $2,999.99 per pair | $149 per pair |
| Ranked | #14 of 76 in Medium Size Powered Bookshelf Speakers | #57 of 76 in Medium Size Powered Bookshelf Speakers |
| Bass Extension (-10dB) | 41.5Hz (measured, spinorama.org) | - |
| Bass Extension (-3dB) | 51.3Hz (measured, spinorama.org) | - |
| Inputs | HDMI eARC, optical, digital coaxial, 3.5mm analog, USB-A (service), Ethernet | TRS, RCA, 3.5mm aux; headphone output |
| Drivers | Uni-Q coincident array: 130mm aluminum woofer + 25mm MAT aluminum dome tweeter | 1” dome tweeter, 4.5” Kevlar woofer |
| App | KEF Connect (placement EQ presets, source selection, firmware updates) | - |
| Bluetooth | Yes | No |
| Bluetooth Version | 4.2 | - |
| EQ | Yes, fixed placement presets (desk/bookshelf/wall-mount) - no automatic room correction | - |
| Weight | 44.3 lbs (20.1 kg) for the pair | 9.7 lbs (4.4 kg)/pair |
| Amplifier Power | 280W (LF) + 100W (HF) per speaker, bi-amped | 120W peak system |
| Dimensions | 12” x 7.9” x 12.2” (305 x 200 x 311 mm) each | 8.9H x 6.1W x 6.9D in |
| Frequency Response | 45Hz - 28kHz ±3dB | 69Hz - 22kHz (Manufacturer specified) |
| Maximum SPL | 108dB at 1m (manufacturer specified) | - |
| Spinorama Preference Score | 5.43 | 3.29 |
| Spinorama Preference Score with Perfect Sub | 7.51 | 6.03 |
| Subwoofer Output | Yes | - |
| Outputs | RCA subwoofer | - |
| XLR Input | No | No |
| RCA Input | No | Yes |
| TRS Input | No | Yes |
| Optical Input | Yes | No |
| Coaxial Input | Yes | No |
| USB Input | No | No |
| HDMI Input | Yes | No |
| AES Input | No | No |
| Aux Input | Yes | Yes |
| Enclosure | - | 2-way powered stereo pair, rear-ported |
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Prices on this page were last checked October 4, 2026 at 9:58 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 LS50 Wireless II: $2,999.99 per pair Amazon KEF Crutchfield eBay
Pros: Erin’s measurements give preference scores of 5.43 standalone and 7.51 with an ideal subwoofer, with a -3dB point around 51Hz. The coincident Uni-Q layout helps preserve tonal consistency across horizontal and vertical listening positions. Low listening-window narrow-band deviation of 0.308 supports relatively clean midrange reproduction. HDMI eARC and streaming functions make it a capable all-in-one stereo system. Measured bass extension of 51.3Hz (-3dB).
Cons: The 3.0dB response span is good but not reference-leading, and dispersion still varies with frequency. Compact bass drivers limit deep-bass output. App placement adjustments are not the same as microphone-based automatic room correction. The price and primary/secondary architecture are practical trade-offs; neither driver geometry nor a single directivity statistic guarantees the best sound in every room.
Full KEF LS50 Wireless II review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 280W (LF) + 100W (HF) per speaker, bi-amped |
| App | KEF Connect (placement EQ presets, source selection, firmware updates) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 41.5Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 51.3Hz (measured, spinorama.org) |
| Bluetooth | Yes |
| Bluetooth Version | 4.2 |
| Coaxial Input | Yes |
| Dimensions | 12” x 7.9” x 12.2” (305 x 200 x 311 mm) each |
| Drivers | Uni-Q coincident array: 130mm aluminum woofer + 25mm MAT aluminum dome tweeter |
| EQ | Yes, fixed placement presets (desk/bookshelf/wall-mount) - no automatic room correction |
| Frequency Response | 45Hz - 28kHz ±3dB |
| HDMI Input | Yes |
| Inputs | HDMI eARC, optical, digital coaxial, 3.5mm analog, USB-A (service), Ethernet |
| Maximum SPL | 108dB at 1m (manufacturer specified) |
| Optical Input | Yes |
| Outputs | RCA subwoofer |
| RCA Input | No |
| Spinorama Preference Score | 5.43 |
| Spinorama Preference Score with Perfect Sub | 7.51 |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | No |
| Weight | 44.3 lbs (20.1 kg) for the pair |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
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M-Audio BX4 D3: $149 per pair Amazon eBay
Pros: Balanced TRS, RCA and front auxiliary/headphone connections, plus tone controls, make this a flexible inexpensive desktop pair. The third-party measurement gives scores of 3.29 standalone and 6.03 with an ideal subwoofer, with -3dB bass estimated around 67Hz.
Cons: A rising response of about 0.62dB per octave and listening-window deviation of 0.546 indicate bright, locally uneven reproduction. The compact system suits moderate nearfield use; the preference estimate does not verify high-level headroom.
Full M-Audio BX4 D3 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 120W peak system |
| Aux Input | Yes |
| Bluetooth | No |
| Coaxial Input | No |
| Dimensions | 8.9H x 6.1W x 6.9D in |
| Drivers | 1” dome tweeter, 4.5” Kevlar woofer |
| Enclosure | 2-way powered stereo pair, rear-ported |
| Frequency Response | 69Hz - 22kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | TRS, RCA, 3.5mm aux; headphone output |
| Optical Input | No |
| RCA Input | Yes |
| Spinorama Preference Score | 3.29 |
| Spinorama Preference Score with Perfect Sub | 6.03 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 9.7 lbs (4.4 kg)/pair |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons