Short answer: the KEF LS50 Wireless II on measured sound quality, the Audioengine HD4 on price. The KEF LS50 Wireless II ranks #19 of 108 powered bookshelf speakers, rated 4.3/5, at $2,199.99. The Audioengine HD4 ranks #87, rated 3.2/5, at $429, $1,770.99 cheaper.
The KEF LS50 Wireless II is the better-sounding option. An all in one wireless stereo system with accurate, consistent sound, HDMI eARC and built in streaming. It has an adjustable EQ, which the Audioengine HD4 lacks. 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: A compact powered pair with Bluetooth, analog inputs and an RCA output for a tidy desktop stereo. 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.
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Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| KEF LS50 Wireless II | Audioengine HD4 | |
|---|---|---|
| Price | $2,199.99 per pair | $429.00 per pair |
| Ranked | #19 of 108 in Medium Size Powered Bookshelf Speakers | #87 of 108 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 | Yes |
| Bluetooth Version | 4.2 | 5.0 |
| 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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