Short answer: the KEF LS50 Wireless II. It ranks #18 of 100 powered bookshelf speakers by sound quality, rated 4.3/5, at $2,999. The Adam Audio A4V ranks #65, rated 3.6/5, at $1,079.98, $1,919.02 cheaper, not enough of a saving to outweigh the sound-quality gap.
What the Adam Audio A4V does well: Compact monitor with onboard DSP, placement controls and room-correction integration. The catch: A small average-deviation figure hides a major localized response irregularity: the selected measurement spans 10.8dB from 300Hz to 5kHz, and listening-window narrow-band deviation is 0.547.
The KEF LS50 Wireless II is the more accurate choice. 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 3.92 for the Adam Audio A4V. It keeps a wired aux input, which the Adam Audio A4V lacks. The tradeoff: The 3.0dB response span is good but not reference-leading, and dispersion still varies with frequency.
Buy the KEF LS50 Wireless II. It is rated higher for sound quality, and the $1,919.02 saving on the Adam Audio A4V is not enough to make up the difference.
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Specifications Side By Side
| Adam Audio A4V | KEF LS50 Wireless II | |
|---|---|---|
| Price | $1,079.98 per pair | $2,999.00 per pair |
| Ranked | #65 of 100 in Medium Size Powered Bookshelf Speakers | #18 of 100 in Medium Size Powered Bookshelf Speakers |
| Enclosure | 2-way active, dual front ports | - |
| Drivers | X-ART folded-ribbon tweeter, 4” MLM woofer | Uni-Q coincident array: 130mm aluminum woofer + 25mm MAT aluminum dome tweeter |
| Dimensions | 10.6H x 6.2W x 8.7D in | 12” x 7.9” x 12.2” (305 x 200 x 311 mm) each |
| Weight | 12.8 lbs (5.8 kg) each | 44.3 lbs (20.1 kg) for the pair |
| Amplifier Power | 130W RMS each | 280W (LF) + 100W (HF) per speaker, bi-amped |
| Inputs | XLR and RCA; Ethernet for control | HDMI eARC, optical, digital coaxial, 3.5mm analog, USB-A (service), Ethernet |
| Spinorama Preference Score | 3.92 | 5.43 |
| Spinorama Preference Score with Perfect Sub | 6.33 | 7.51 |
| XLR Input | Yes | No |
| RCA Input | Yes | No |
| TRS Input | No | No |
| Optical Input | No | Yes |
| Coaxial Input | No | Yes |
| USB Input | No | No |
| HDMI Input | No | Yes |
| AES Input | No | No |
| Aux Input | No | Yes |
| Bluetooth | No | Yes |
| Frequency Response | 58Hz - 41kHz (-3dB) (Manufacturer specified) | 45Hz - 28kHz ±3dB |
| Bass Extension (-10dB) | - | 41.5Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | - | 51.3Hz (measured, spinorama.org) |
| App | - | KEF Connect (placement EQ presets, source selection, firmware updates) |
| Bluetooth Version | - | 4.2 |
| EQ | - | Yes, fixed placement presets (desk/bookshelf/wall-mount) - no automatic room correction |
| Maximum SPL | - | 108dB at 1m (manufacturer specified) |
| Subwoofer Output | - | Yes |
| Outputs | - | RCA subwoofer |
Related Speaker Comparisons
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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
Adam Audio A4V: $1,079.98 per pair Amazon B&H Photo Video eBay
Same family: the ADAM Audio A44H (larger bookshelf, ranked higher, estimated 3.8/5), the Adam Audio A7V (larger bookshelf, rated 4/5), the ADAM Audio A8H (larger bookshelf, estimated 4.4/5) and the ADAM Audio A77H (larger bookshelf, estimated 4.4/5).
Pros: Compact monitor with onboard DSP, placement controls and room-correction integration. ASR’s Klippel data gives a -3dB point around 59Hz and preference scores of 3.92 standalone and 6.33 with an ideal subwoofer. Its adjustment facilities are useful when placement or tonal correction is needed.
Cons: A small average-deviation figure hides a major localized response irregularity: the selected measurement spans 10.8dB from 300Hz to 5kHz, and listening-window narrow-band deviation is 0.547. The native response should therefore not be called smoothly neutral. Correction potential is not the same as stock performance, and analog audio inputs mean a separate interface is needed for USB sources.
Full Adam Audio A4V review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 130W RMS each |
| Aux Input | No |
| Bluetooth | No |
| Coaxial Input | No |
| Dimensions | 10.6H x 6.2W x 8.7D in |
| Drivers | X-ART folded-ribbon tweeter, 4” MLM woofer |
| Enclosure | 2-way active, dual front ports |
| Frequency Response | 58Hz - 41kHz (-3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | XLR and RCA; Ethernet for control |
| Optical Input | No |
| RCA Input | Yes |
| Spinorama Preference Score | 3.92 |
| Spinorama Preference Score with Perfect Sub | 6.33 |
| TRS Input | No |
| USB Input | No |
| Weight | 12.8 lbs (5.8 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
KEF LS50 Wireless II: $2,999.00 per pair Amazon KEF Crutchfield eBay
Same family: the KEF LSX II LT (smaller bookshelf, ranked lower, rated 4/5), the KEF LSX II (smaller bookshelf, estimated 4.1/5) and the KEF LS60 (floorstanding, rated 4.8/5).
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
- Head-to-Head Comparisons
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