Short answer: the JBL 4305P. It ranks #40 of 119 powered bookshelf speakers by sound quality, rated 4.4/5, at $1,499.99; the KEF LS50 Wireless II ranks #19, rated 4.3/5, and costs $2,999, so there is little reason to consider the other one.
The JBL 4305P is the deeper-bass pick. The measured 1.5dB response span from 300Hz to 5kHz supports even mids, with a 7.45 ideal-subwoofer score and 45.4Hz -3dB bass extension. Its bass reaches about 45Hz before falling 3dB, against 51.3Hz for the KEF LS50 Wireless II. Watch for: Crossover-region directivity changes mean the narrow on-axis span does not describe every listening angle.
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. The catch: The 3.0dB response span is good but not reference-leading, and dispersion still varies with frequency.
Buy the JBL 4305P. It is rated higher for sound quality than the KEF LS50 Wireless II and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
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The measured 1.5dB response span from 300Hz to 5kHz supports even mids, with a 7.45 ideal-subwoofer score and 45.4Hz -3dB bass extension.
Amazon $1,499.99 JBL eBay
Erin’s measurements give preference scores of 5.43 standalone and 7.51 with an ideal subwoofer, with a -3dB point around 51Hz.
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Specifications Side By Side
| JBL 4305P | KEF LS50 Wireless II | |
|---|---|---|
| Price | $1,499.99 per pair | $2,999.00 per pair |
| Ranked | #40 of 119 in Large Size Powered Bookshelf Speakers | #19 of 108 in Medium Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 45Hz (measured, Erin’s Audio Corner) | 51.3Hz (measured, spinorama.org) |
| Bass Extension (-10dB) | 40.5Hz (measured, Erin’s Audio Corner) | 41.5Hz (measured, spinorama.org) |
| Maximum SPL | ~93dB at 2m in-room before limiting (measured, Erin’s Audio Corner) | 108dB at 1m (manufacturer specified) |
| Amplifier Power | 300W system: 125W LF + 25W HF per speaker | 280W (LF) + 100W (HF) per speaker, bi-amped |
| Drivers | 5.25-inch pulp woofer; 1-inch annular compression driver | Uni-Q coincident array: 130mm aluminum woofer + 25mm MAT aluminum dome tweeter |
| Dimensions | 13.2H x 8.3W x 8.8D inches | 12” x 7.9” x 12.2” (305 x 200 x 311 mm) each |
| Spinorama Preference Score | 5.44 | 5.43 |
| Spinorama Preference Score with Perfect Sub | 7.45 | 7.51 |
| Inputs | XLR/TRS combo, 3.5mm Aux, Optical, USB-B, Ethernet | HDMI eARC, optical, digital coaxial, 3.5mm analog, USB-A (service), Ethernet |
| XLR Input | Yes | No |
| RCA Input | No | No |
| TRS Input | Yes | No |
| Optical Input | Yes | Yes |
| Coaxial Input | No | Yes |
| USB Input | Yes | No |
| HDMI Input | No | Yes |
| AES Input | No | No |
| Aux Input | Yes | Yes |
| Weight | Primary 14.6 lbs (6.6 kg), Secondary 14.1 lbs (6.4 kg) | 44.3 lbs (20.1 kg) for the pair |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.1 | 4.2 |
| Frequency Response | 45Hz - 25kHz (-6dB) (Manufacturer specified) | 45Hz - 28kHz ±3dB |
| App | - | KEF Connect (placement EQ presets, source selection, firmware updates) |
| EQ | - | Yes, fixed placement presets (desk/bookshelf/wall-mount) - no automatic room correction |
| Subwoofer Output | - | Yes |
| Outputs | - | RCA subwoofer |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared.
Measurement data: JBL 4305P (measured by Erin’s Audio Corner) and KEF LS50 Wireless II (measured by Erin’s Audio Corner), via spinorama.org.
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