Short answer: the KEF LS50 Meta. It ranks #4 of 179 bookshelf speakers by sound quality, rated 4.5/5, at $1,599.99. The PSB Imagine B50 ranks #52, rated 3.7/5, at $999, $600.99 cheaper, not enough of a saving to outweigh the sound-quality gap.
The KEF LS50 Meta is the more accurate pick. An iconic compact KEF speaker with highly accurate sound, pinpoint imaging and a coaxial driver that keeps tone even across the room. Its measured preference score, a predictor of how neutral it sounds, is 5.74 against 4.63 for the PSB Imagine B50. Watch for: F3 of 67Hz and F10 of 42Hz mean it doesn’t get much below 50Hz in-room; a subwoofer is recommended for real bass.
The case for the PSB Imagine B50: Standmount bookshelf speakers with a titanium dome tweeter and woven carbon fiber woofer from PSB’s current Imagine line. Watch for: On-axis smoothness of just 0.235 and a deviation of 0.368dB are unremarkable for the price, with a +0.22dB per octave upward tilt giving it a brighter-leaning balance, a predicted in-room smoothness of just 0.35, and a Harman in-room bass extension estimate of only 49Hz.
Buy the KEF LS50 Meta. It is rated higher for sound quality, and the $600.99 saving on the PSB Imagine B50 is not enough to make up the difference.
Still deciding? The full Passive Home rankings cover every ranked option.
An iconic compact KEF speaker with highly accurate sound, pinpoint imaging and a coaxial driver that keeps tone even across the room.
Standmount bookshelf speakers with a titanium dome tweeter and woven carbon fiber woofer from PSB’s current Imagine line.
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Specifications Side By Side
| KEF LS50 Meta | PSB Imagine B50 | |
|---|---|---|
| Price | $1,599.99 per pair | $999 per pair |
| Ranked | #4 of 179 in Medium Size Bookshelf Speakers | #52 of 179 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) | 44.4Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 68Hz (measured, Erin’s Audio Corner) | 69.6Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Dimensions | 11.9”H x 7.9”W x 11”D (302 x 200 x 280.5 mm) | 6.75W x 11.8H x 9.875D in |
| Impedance | 8 ohms nominal (3.7 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 8 ohms nominal, 4 ohms minimum |
| Sensitivity | 83dB (measured average, Erin’s Audio Corner; 85dB manufacturer specified) | 85dB anechoic / 87dB in-room |
| Drivers | 130 mm (5.25 in.) aluminium cone woofer, 25 mm (1 in.) vented aluminium dome with Metamaterial Absorption tweeter | 1” titanium dome tweeter (ferrofluid neodymium magnet), 5.25” woven carbon-fiber woofer |
| Weight | 17.2 lbs (7.8 kg) each | approx. 11.2 lbs (5.1 kg) each |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 5.74 | 4.63 |
| Spinorama Preference Score with Perfect Sub | 7.88 | 6.92 |
| DIY Kit | No | No |
| Enclosure | - | 2-way, bass-reflex with rear slot port |
| Country | - | Canada (design) |
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