Short answer: the KEF R3. It ranks #15 of 222 bookshelf speakers by sound quality, rated 4.5/5, at $1,544.56; the JBL L100 Classic MKII ranks #95, rated 3.9/5, and costs $5,599.90, so there is not much of a tradeoff to weigh.
The KEF R3 is the more accurate choice. A three way bookshelf speaker with KEF’s coaxial driver for stable imaging across seats and very low distortion, easy to run with a modest amp. Its measured preference score, a predictor of how neutral it sounds, is 6.20 against 4.64 for the JBL L100 Classic MKII. Watch for: The low-frequency alignment rolls gradually rather than delivering high-output sub-bass; KEF specifies 58Hz +/-3dB and Erin’s high-level data supports using an 80Hz subwoofer crossover.
The JBL L100 Classic MKII is the deeper-bass option. A big modern take on a classic studio monitor, with a 12 inch woofer, smooth even sound, deep bass and adjustable treble controls. Its bass reaches about 50.5Hz before falling 3dB, against 58Hz for the KEF R3. The tradeoff: The response has a moderate -0.30dB-per-octave downward tilt and the bass alignment is somewhat resonant at Q 1.64.
Buy the KEF R3. It is rated higher for sound quality than the JBL L100 Classic MKII and costs less, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Passive Home rankings.
Measured Differences
- Efficiency: the JBL L100 Classic MKII is rated at 90 dB sensitivity against 86 dB for the KEF R3, so it plays as loud with roughly half the amplifier power.
- Close enough not to matter: bass extension (35.2 Hz vs 32.2 Hz, 10 dB down).
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Specifications Side By Side
| KEF R3 | JBL L100 Classic MKII | |
|---|---|---|
| Price | $1,544.56 per pair | $5,599.90 per pair |
| Ranked | #15 of 222 in Large Size Bookshelf Speakers | #95 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | Approximately 58Hz (manufacturer specified; consistent with Erin’s measured roll-off) | 50.5Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Bass Extension (-10dB) | 35.2Hz (measured, Audio Science Review) | about 32.2Hz (measured, Erin’s Audio Corner) |
| Sensitivity | Approximately 86-87dB/2.83V/1m (measured, Erin’s Audio Corner) | 90dB |
| Impedance | 8 ohms nominal; suitable for Erin’s 4/8-ohm-rated amplifier | 4 ohms |
| Drivers | 1” tweeter coaxial with 5” midrange; 6.5” woofer | 1” titanium-dome tweeter, 5.25” midrange, 12” pulp-cone woofer |
| Dimensions | 16.6”H x 7.9”W x 13.2”D | 25.1H x 15.7W x 14.6D in |
| Woofer Cabinet | ported, rear Flexible Port | - |
| Weight | 29.9 lbs (13.55 kg) each | 58.9 lbs (26.7 kg) each |
| Spinorama Preference Score | 6.2 (spinorama.org) | 4.64 |
| Spinorama Preference Score with Perfect Sub | 7.97 (spinorama.org) | 6.59 |
| DIY Kit | No | No |
| Enclosure | - | 3-way, front-ported |
| Country | - | United States (design) |
Where the Ratings Come From
- KEF R3: Spinorama.org measurements and reviews by Erin’s Audio Corner and Audio Science Review.
- JBL L100 Classic MKII: Spinorama.org measurements and reviews by Erin’s Audio Corner.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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