Short answer: the KEF LS50 Wireless II on measured sound quality, the Audioengine HD4 on price. The KEF LS50 Wireless II ranks #14 of 67 powered bookshelf speakers, rated 4.3/5, at $2,999.99. The Audioengine HD4 ranks #58, rated 3.2/5, at $429, $2,570.99 cheaper.
What the KEF LS50 Wireless II does well: Erin’s measurements give preference scores of 5.43 standalone and 7.51 with an ideal subwoofer, with a -3dB point around 51Hz. Watch for: The 3.0dB response span is good but not reference-leading, and dispersion still varies with frequency.
The case for the Audioengine HD4: Compact powered cabinets, analog input options and RCA output can simplify a desktop stereo system. Watch for: The compact cabinets suit close desktop listening rather than a large-room system.
Buy the KEF LS50 Wireless II when sound quality outweighs the price for you, and the Audioengine HD4 when the price outweighs sound quality instead.
Want more options? Browse the full Powered Home rankings.
Specifications Side By Side
| KEF LS50 Wireless II | Audioengine HD4 | |
|---|---|---|
| Price | $2,999.99 per pair | $429.00 per pair |
| Ranked | #14 of 67 in Medium Size Powered Bookshelf Speakers | #58 of 67 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 | Bluetooth, Aux, RCA Input |
| Drivers | Uni-Q coincident array: 130mm aluminum woofer + 25mm MAT aluminum dome tweeter | 4” (102mm) woofer |
| App | KEF Connect (placement EQ presets, source selection, firmware updates) | No |
| Bluetooth | Yes, 4.2 | Yes |
| EQ | Yes, fixed placement presets (desk/bookshelf/wall-mount) - no automatic room correction | No |
| Weight | 44.3 lbs (20.1 kg) for the pair | 7.3 lbs (3.3 kg) |
| Amplifier Power | 280W (LF) + 100W (HF) per speaker, bi-amped | 50w RMS Per Speaker |
| Dimensions | 12” x 7.9” x 12.2” (305 x 200 x 311 mm) each | 9”H x 5.5”W x 6.5”D (228.6 x 139.7 x 165.1 mm) |
| Frequency Response | 45Hz - 28kHz ±3dB | 60 Hz-20 kHz (-3dB) (Manufacturer specified) |
| Maximum SPL | 108dB at 1m (manufacturer specified) | - |
| Spinorama Preference Score | 5.43 | - |
| Spinorama Preference Score with Perfect Sub | 7.51 | - |
| Subwoofer Output | Yes | Yes |
| Outputs | RCA subwoofer | RCA variable output (subwoofer) |
| XLR Input | No | No |
| RCA Input | No | Yes |
| TRS Input | No | No |
| Optical Input | Yes | No |
| Coaxial Input | Yes | No |
| USB Input | No | No |
| HDMI Input | Yes | No |
| AES Input | No | No |
| Aux Input | Yes | Yes |
| Bluetooth Codecs | - | SBC, AAC, aptX, aptX HD |
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Prices on this page were last checked September 26, 2026 at 11:14 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, 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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Audioengine HD4: $429.00 per pair Amazon eBay
Pros: Compact powered cabinets, analog input options and RCA output can simplify a desktop stereo system. Its modest footprint is useful where larger studio monitors are impractical.
Cons: The compact cabinets suit close desktop listening rather than a large-room system. A separate subwoofer adds cost and space if deeper bass is a priority.
Full Audioengine HD4 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 50w RMS Per Speaker |
| App | No |
| Aux Input | Yes |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, aptX, aptX HD |
| Coaxial Input | No |
| Dimensions | 9”H x 5.5”W x 6.5”D (228.6 x 139.7 x 165.1 mm) |
| Drivers | 4” (102mm) woofer |
| EQ | No |
| Frequency Response | 60 Hz-20 kHz (-3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | Bluetooth, Aux, RCA Input |
| Optical Input | No |
| Outputs | RCA variable output (subwoofer) |
| RCA Input | Yes |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | No |
| Weight | 7.3 lbs (3.3 kg) |
| XLR Input | No |
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- Reviews, Comparisons and Sound Samples
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