Short answer: the MoFi SourcePoint 8. It ranks #17 of 134 bookshelf speakers by sound quality, rated 4.5/5, at $2,594. The Paradigm Founder 40B ranks #56, 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 case for the MoFi SourcePoint 8: 8” twin-drive concentric driver paired with a 1.25” soft dome tweeter, in a diffraction-reducing baffle design; rated 47Hz-30kHz. 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.
What the Paradigm Founder 40B does well: A 6-inch aluminum-magnesium woofer and a 1-inch ceramic dome tweeter in a deep waveguide, with Paradigm’s perforated phase-aligning lenses over both. 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.
Specifications Side By Side
| MoFi SourcePoint 8 | Paradigm Founder 40B | |
|---|---|---|
| Price | $2594 per pair | $2,399.98 per pair |
| Ranked | #17 of 134 in Large Size Bookshelf Speakers | #56 of 134 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) |
Related Speaker Comparisons
How MoFi SourcePoint 8 compares with other leading options:
- MoFi SourcePoint 8 vs Perlisten S4b
- MoFi SourcePoint 8 vs KEF Reference 1 Meta
- MoFi SourcePoint 8 vs GR-Research NX-Studio
- MoFi SourcePoint 8 vs March Audio Sointuva AWG
- MoFi SourcePoint 8 vs AsciLab C6B
Prices on this page were last checked September 30, 2026 at 2:57 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.
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The Two Speakers In Full
MoFi SourcePoint 8: $2594 per pair Crutchfield eBay
Pros: 8” twin-drive concentric driver paired with a 1.25” soft dome tweeter, in a diffraction-reducing baffle design; rated 47Hz-30kHz. Notably more neutral and true-to-source than its sibling SourcePoint 10, which the reviewer found a bit too bright in the treble by comparison: measured about 4-5dB less high-frequency output. Excellent imaging: passed multiple stereo-panning and depth tests, including smooth continuous left-to-right pans without wobble and correct front-to-back layering of vocals versus percussion. Wide horizontal dispersion of about ±60°, broader than the reviewer expected from a coaxial design, and forgiving enough in placement that about 10° of toe-out variance and moving above or below the tweeter axis both still sound good. Excellent dynamic range and compression linearity: about 26dB of headroom up to 102dB/1m equivalent, with issues only appearing below about 60Hz. 8-ohm nominal impedance made it easy to drive on everything from a budget Denon AVR to a high-end Macintosh amplifier. No significant evidence of woofer-cone modulation distortion affecting the tweeter, even at 96dB/1m. Measured bass extension of 52Hz (-3dB), with a measured sensitivity of 86.3dB.
Cons: 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 rear-ported cabinet (two ports) means it can’t be placed too close to a wall without the bass becoming overblown: the reviewer settled on about 2 feet of clearance. F3 of 52Hz and F10 of 43Hz mean genuine deep bass tops out in the mid-40s Hz in-room: a subwoofer is still needed for true low-end extension. Harmonic distortion crosses the reviewer’s 3% threshold at 96dB (though it’s second-order and less audibly significant), and multitone distortion becomes noticeably more audible at that same output level. Vertical response doesn’t perfectly mirror horizontal, since the cabinet is a rectangle rather than a perfect square around the driver.
Full MoFi SourcePoint 8 review and specifications →
| Bass Extension (-10dB) | 43Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 52Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 18”H x 11.4”W x 13.2”D (457.2 x 289.6 x 335.3 mm) |
| Drivers | 8” woofer, 1.25-inch soft-dome tweeter |
| Impedance | 8 ohms nominal (8 ohms minimum above 80Hz, measured, Erin’s Audio Corner) |
| Sensitivity | 86.3dB (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 5.15 |
| Spinorama Preference Score with Perfect Sub | 7.28 |
| Weight | 28 lbs (12.7 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Why Do People Love the MoFi SourcePoint 8? More from Erin’s Audio Corner →
- Erin’s Audio Corner Website MoFi SourcePoint 8
- Erin’s Audio Corner: Upgrade Your Sound with These 6 Surprisingly Affordable Speakers!
- Erin’s Audio Corner: My Personal Favorite Speakers Under $2500
- Erin’s Audio Corner: My Top Picks of 2023: Must-Haves Under $3000
- GR-Research: Danny Tackles Andrews Jones: The Source Point 8! Spoiler Alert (It’s Really Good) More from GR-Research →
- Erin’s Audio Corner Measurements (spinorama.org)
- Head-to-Head Comparisons
- MoFi SourcePoint 8 vs Buchardt Audio E50
- MoFi SourcePoint 8 vs KEF R3
- MoFi SourcePoint 8 vs Epos ES14N
- MoFi SourcePoint 8 vs AsciLab F6Bs
- MoFi SourcePoint 8 vs Wharfedale Aura 2
- MoFi SourcePoint 8 vs Arendal 1528 Monitor 8
- MoFi SourcePoint 8 vs KEF Q Concerto Meta
- MoFi SourcePoint 8 vs Ascend Acoustics CMT-340 SE2
- See all 59 comparisons
Paradigm Founder 40B: $2,399.98 per pair Audio Advice eBay
Pros: A 6-inch aluminum-magnesium woofer and a 1-inch ceramic dome tweeter in a deep waveguide, with Paradigm’s perforated phase-aligning lenses over both. Toed in 30 degrees as Paradigm recommends, Erin’s Audio Corner measured an exceptionally even listening window, within a 1.7dB span from 300Hz to 5kHz, with low on-axis deviation (0.36) and wide horizontal dispersion averaging 60 degrees, for a preference score of 4.89 that rises to 7.11 with an ideal subwoofer. Sensitivity is a high 89dB anechoic. Measured bass extension of 69.6Hz (-3dB).
Cons: 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. It needs the recommended toe-in: measured straight on, its response is less even (preference score 4.58) and the tonal balance shifts. At about $2,400 a pair it is expensive for a 6-inch two-way.
Full Paradigm Founder 40B review and specifications →
| Bass Extension (-10dB) | 43.9Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 69.6Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 14.5”H x 7.8”W x 12.6”D (368 x 197 x 320 mm) |
| Drivers | 6” AL-MAG woofer; 1” AL-MAC ceramic dome tweeter with waveguide |
| Frequency Response | 69Hz-23kHz ±2dB (manufacturer specified) |
| Impedance | Compatible with 8 ohms (manufacturer specified) |
| Sensitivity | 89dB anechoic, 92dB in-room (manufacturer specified) |
| Spinorama Preference Score | 4.89 |
| Spinorama Preference Score with Perfect Sub | 7.11 |
| Weight | 24.9 lbs (11.3 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons