Short answer: the MoFi SourcePoint 8. It ranks #17 of 222 bookshelf speakers by sound quality, rated 4.5/5, at $2,594. The Paradigm Founder 40B ranks #67, rated 4.1/5, at $2,399.98, $194.02 cheaper, a saving that is not big enough to make up the sound-quality gap.
The MoFi SourcePoint 8 is the better-sounding, deeper-bass pick. 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 69.6Hz for the Paradigm Founder 40B. The tradeoff: 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.
What the Paradigm Founder 40B does well: A bookshelf speaker with very even, wide sound when toed in, high sensitivity, and phase aligning lenses over its drivers. Watch for: Bass rolls off early for a speaker this size, about 70Hz at -3dB and 44Hz at -10dB, so it works best with a subwoofer or close to a wall.
Buy the MoFi SourcePoint 8. It is rated higher for sound quality, and saving $194.02 with the Paradigm Founder 40B does not make up for the sound-quality gap.
Still deciding? The full Passive Home rankings cover every ranked option.
Measured Differences
- Efficiency: the Paradigm Founder 40B is rated at 89 dB sensitivity against 86.3 dB for the MoFi SourcePoint 8, so it plays as loud with roughly two thirds of the amplifier power.
- Close enough not to matter: bass extension (43 Hz vs 43.9 Hz, 10 dB down); preference score with a subwoofer (7.3 vs 7.1).
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Specifications Side By Side
| MoFi SourcePoint 8 | Paradigm Founder 40B | |
|---|---|---|
| Price | $2594 per pair | $2,399.98 per pair |
| Ranked | #17 of 222 in Large Size Bookshelf Speakers | #67 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) | 43.9Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 52Hz (measured, Erin’s Audio Corner) | 69.6Hz (measured, Erin’s Audio Corner) |
| Dimensions | 18”H x 11.4”W x 13.2”D (457.2 x 289.6 x 335.3 mm) | 14.5”H x 7.8”W x 12.6”D (368 x 197 x 320 mm) |
| Impedance | 8 ohms nominal (8 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | Compatible with 8 ohms (manufacturer specified) |
| Sensitivity | 86.3dB (measured, Erin’s Audio Corner) | 89dB anechoic, 92dB in-room (manufacturer specified) |
| Drivers | 8” woofer, 1.25-inch soft-dome tweeter | 6” AL-MAG woofer; 1” AL-MAC ceramic dome tweeter with waveguide |
| Weight | 28 lbs (12.7 kg) each | 24.9 lbs (11.3 kg) each |
| Woofer Cabinet | ported, rear | ported |
| Spinorama Preference Score | 5.15 | 4.89 |
| Spinorama Preference Score with Perfect Sub | 7.28 | 7.11 |
| DIY Kit | No | No |
| Frequency Response | - | 69Hz-23kHz ±2dB (manufacturer specified) |
Where the Ratings Come From
- MoFi SourcePoint 8: Spinorama.org measurements and reviews by Erin’s Audio Corner and GR-Research.
- Paradigm Founder 40B: 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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