Short answer: the KEF R3. Both are rated 4.5/5 for sound quality (#15 and #17 of 222 bookshelf speakers), and the KEF R3 costs $1,544.56 against $2,594 for the MoFi SourcePoint 8, with sound quality a draw, the lower price decides it.
The MoFi SourcePoint 8 is the deeper-bass choice. A bookshelf speaker with an 8 inch concentric driver, neutral sound, excellent imaging, and wide dispersion that forgives placement. Its bass reaches about 52Hz before falling 3dB, against 58Hz for the KEF R3. The catch: Like other coincident designs, produces diffraction dips around 4kHz and 7kHz when pointed directly on-axis; needs about 10-15° of toe-out to smooth those out.
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 5.15 for the MoFi SourcePoint 8. The tradeoff: 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.
Buy the KEF R3. Both are rated the same for sound quality, and it costs $1,049.44 less than the MoFi SourcePoint 8.
Looking for alternatives? See the complete Passive Home rankings.
Measured Differences
- Bass depth: the KEF R3 reaches 35.2 Hz (10 dB down) against 43 Hz for the MoFi SourcePoint 8, about half an octave deeper. You hear more of the lowest bass notes and kick drums.
Prices on this page were last checked November 14, 2026 at 6:17 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| MoFi SourcePoint 8 | KEF R3 | |
|---|---|---|
| Price | $2594 per pair | $1,544.56 per pair |
| Ranked | #17 of 222 in Large Size Bookshelf Speakers | #15 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) | 35.2Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 52Hz (measured, Erin’s Audio Corner) | Approximately 58Hz (manufacturer specified; consistent with Erin’s measured roll-off) |
| Dimensions | 18”H x 11.4”W x 13.2”D (457.2 x 289.6 x 335.3 mm) | 16.6”H x 7.9”W x 13.2”D |
| Impedance | 8 ohms nominal (8 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 8 ohms nominal; suitable for Erin’s 4/8-ohm-rated amplifier |
| Sensitivity | 86.3dB (measured, Erin’s Audio Corner) | Approximately 86-87dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Drivers | 8” woofer, 1.25-inch soft-dome tweeter | 1” tweeter coaxial with 5” midrange; 6.5” woofer |
| Weight | 28 lbs (12.7 kg) each | 29.9 lbs (13.55 kg) each |
| Woofer Cabinet | ported, rear | ported, rear Flexible Port |
| Spinorama Preference Score | 5.15 | 6.2 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.28 | 7.97 (spinorama.org) |
| DIY Kit | No | No |
Where the Ratings Come From
- MoFi SourcePoint 8: Spinorama.org measurements and reviews by Erin’s Audio Corner and GR-Research.
- KEF R3: Spinorama.org measurements and reviews by Erin’s Audio Corner and Audio Science Review.
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.
Related Speaker Comparisons
More worthwhile head-to-heads for KEF R3: