Short answer: the MoFi SourcePoint 888. It ranks #4 of 71 floorstanding speakers by sound quality at $5495; the Radiant Acoustics Clarity 66 ranks #5 and costs $7998, which makes this an easy call rather than a real tradeoff.
What the Radiant Acoustics Clarity 66 offers: ASR’s revised Spinorama measurement shows bass reaching 32.2Hz at -3dB and 27.8Hz at -6dB, giving substantial low-end weight without a subwoofer. The response spans 2.3dB from 300Hz to 5kHz, with preference scores of 5.10 standalone and 6.12 with an ideal subwoofer. The review’s exceptionally low bass distortion at ordinary levels complements that extension, while dual 6.5-inch Purifi woofers provide a strong foundation for full-range listening. Watch for: Vertical directivity is narrow and horizontal coverage is uneven, so listening height and placement affect tonal balance. Treble resonances and response irregularities keep it from reference-level neutrality. Spinorama’s modeled EQ improves the scores to 6.09 standalone and 6.99 with an ideal subwoofer, but those are corrected results, not stock performance. Measured sensitivity is 85.9dB at 2.83V/1m with a nominal 4-ohm load; use an amplifier comfortable driving 4 ohms. Distortion rises at very high playback levels.
What the MoFi SourcePoint 888 offers: Three-way vented design: an 8” coaxial mid-range/1.25” dome tweeter driver plus two additional 8” woofers crossed at about 130Hz, giving genuinely full-range output (F3 34Hz, F10 26Hz) other than the deepest subsonic content. Ranked by the reviewer among his personal top three speakers out of roughly 200 tested, alongside the KEF Blade 2 Meta and Dutch & Dutch 8C, despite costing a small fraction of either. Excellent compression/dynamic-range linearity, holding its own against much pricier speakers like the March Audio Sointuva AWG, KEF Reference 1 Meta, and KEF Blade 2 Meta. On-axis (0°) and 30°-off-axis estimated in-room responses track within about 1-1.5dB of each other above 500Hz, so tonal balance barely changes with placement or listening angle - excellent for multi-seat home theater or entertaining. Wide horizontal dispersion of about ±60°. Distortion stays low: under 1% at 86dB, and under 1% above 200Hz even at 96dB, with multitone distortion mostly under 1% as well. Not a difficult amplifier load (5-ohm minimum impedance, 4.2-ohm minimum EPDR). Checks the three boxes the reviewer considers essential for a home theater speaker: low compression, low distortion, and excellent directivity. Watch for: A significant investment, best ordered from a dealer with a good return policy. Large and heavy floorstander (about 96 lbs, 42” tall) requiring real floor space and rear clearance. Positioning is fairly specific: needs about 2 feet from the rear wall - closer causes boominess in the 40-50Hz region, farther loses bass extension. Vertical dispersion (about ±50°) is narrower than horizontal (about ±60°), since the two 8” woofers are spaced vertically apart on a tower cabinet, causing some vertical mismatch at lower frequencies. A small on-axis dip around 500Hz and a deliberately lower tweeter level (about 0.5dB below the midrange) are intentional design choices for smoother in-room response, but mean the raw on-axis measurement isn’t perfectly flat. A mild diffraction-related dip appears around 3kHz in directivity measurements. Toeing the speaker out more than about 10° starts to noticeably reduce top-end energy.
Buy the MoFi SourcePoint 888. It ranks higher for sound quality than the Radiant Acoustics Clarity 66 and costs less, so the other one has nothing left to offer.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Radiant Acoustics Clarity 66 | MoFi SourcePoint 888 | |
|---|---|---|
| Price | $7,998 per pair | $5495 per pair |
| Ranked | #5 of 71 in Large Size Floorstanding Speakers | #4 of 71 in Large Size Floorstanding Speakers |
| Bass Extension (-3dB) | 32.2Hz (measured, Audio Science Review) | 34Hz (measured, Erin's Audio Corner) |
| Bass Extension (-10dB) | 24.4Hz (measured, Audio Science Review) | 26Hz (measured, Erin's Audio Corner) |
| Sensitivity | 85.9dB (2.83V/1m, measured, Audio Science Review; 86dB manufacturer specified) | 85.6dB (measured, Erin's Audio Corner) |
| Drivers | Custom waveguide-loaded tweeter with beam-expansion fins, 2x 6.5" Purifi USHINDI aluminum-cone woofers | Dual 8" paper cone woofers, 8" Paper Cone midrange, 1.25" wide roll soft dome tweeter |
| Dimensions | 40.4"H x 8.7"W x 14"D (1025 x 222 x 355 mm) | 41.2"H x 12.6"W x 16.1"D (1046.5 x 320 x 408.9 mm) |
| Weight | 101.4 lbs (46 kg) each | 94.8 lbs (43 kg) each |
| Impedance | 4 ohms nominal | 6 ohms nominal, 5 ohms minimum (measured, Erin's Audio Corner) |
| Crossover Frequency | 2.4kHz | - |
| Woofer Cabinet | ported, large rear port | ported, rear |
| Spinorama Preference Score | 5.10 | 5.21 |
| Spinorama Preference Score with Perfect Sub | 6.12 | 6.33 |
Related Speaker Comparisons
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- GR-Research NX-Treme vs MoFi SourcePoint 888
- KEF Blade Two Meta vs MoFi SourcePoint 888
- MoFi SourcePoint 888 vs MoFi SourcePoint V10 Master Edition
- MoFi SourcePoint 888 vs Ascend Acoustics ELX Ribbon Tower
- MoFi SourcePoint 888 vs JBL HDI-3800
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The Two Speakers In Full
Radiant Acoustics Clarity 66: $7,998 per pair Radiant Acoustics eBay
Pros: ASR’s revised Spinorama measurement shows bass reaching 32.2Hz at -3dB and 27.8Hz at -6dB, giving substantial low-end weight without a subwoofer. The response spans 2.3dB from 300Hz to 5kHz, with preference scores of 5.10 standalone and 6.12 with an ideal subwoofer. The review’s exceptionally low bass distortion at ordinary levels complements that extension, while dual 6.5-inch Purifi woofers provide a strong foundation for full-range listening. Measured bass extension of 32.2Hz (-3dB), with a measured sensitivity of 85.9dB.
Cons: Vertical directivity is narrow and horizontal coverage is uneven, so listening height and placement affect tonal balance. Treble resonances and response irregularities keep it from reference-level neutrality. Spinorama’s modeled EQ improves the scores to 6.09 standalone and 6.99 with an ideal subwoofer, but those are corrected results, not stock performance. Measured sensitivity is 85.9dB at 2.83V/1m with a nominal 4-ohm load; use an amplifier comfortable driving 4 ohms. Distortion rises at very high playback levels.
Full Radiant Acoustics Clarity 66 review and specifications →
| Bass Extension (-10dB) | 24.4Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 32.2Hz (measured, Audio Science Review) |
| Crossover Frequency | 2.4kHz |
| Dimensions | 40.4"H x 8.7"W x 14"D (1025 x 222 x 355 mm) |
| Drivers | Custom waveguide-loaded tweeter with beam-expansion fins, 2x 6.5" Purifi USHINDI aluminum-cone woofers |
| Impedance | 4 ohms nominal |
| Sensitivity | 85.9dB (2.83V/1m, measured, Audio Science Review; 86dB manufacturer specified) |
| Spinorama Preference Score | 5.10 |
| Spinorama Preference Score with Perfect Sub | 6.12 |
| Weight | 101.4 lbs (46 kg) each |
| Woofer Cabinet | ported, large rear port |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Radiant Acoustics Clarity 66 vs Ascend Acoustics ELX Ribbon Tower
- Radiant Acoustics Clarity 66 vs MoFi SourcePoint V10 Master Edition
- Radiant Acoustics Clarity 66 vs KEF Blade Two Meta
- Radiant Acoustics Clarity 66 vs Revel F328Be
- Radiant Acoustics Clarity 66 vs Revel F226Be
- Radiant Acoustics Clarity 66 vs JBL 4367
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MoFi SourcePoint 888: $5495 per pair Crutchfield eBay
Pros: Three-way vented design: an 8” coaxial mid-range/1.25” dome tweeter driver plus two additional 8” woofers crossed at about 130Hz, giving genuinely full-range output (F3 34Hz, F10 26Hz) other than the deepest subsonic content. Ranked by the reviewer among his personal top three speakers out of roughly 200 tested, alongside the KEF Blade 2 Meta and Dutch & Dutch 8C, despite costing a small fraction of either. Excellent compression/dynamic-range linearity, holding its own against much pricier speakers like the March Audio Sointuva AWG, KEF Reference 1 Meta, and KEF Blade 2 Meta. On-axis (0°) and 30°-off-axis estimated in-room responses track within about 1-1.5dB of each other above 500Hz, so tonal balance barely changes with placement or listening angle - excellent for multi-seat home theater or entertaining. Wide horizontal dispersion of about ±60°. Distortion stays low: under 1% at 86dB, and under 1% above 200Hz even at 96dB, with multitone distortion mostly under 1% as well. Not a difficult amplifier load (5-ohm minimum impedance, 4.2-ohm minimum EPDR). Checks the three boxes the reviewer considers essential for a home theater speaker: low compression, low distortion, and excellent directivity. Measured bass extension of 34Hz (-3dB), with a measured sensitivity of 85.6dB.
Cons: A significant investment, best ordered from a dealer with a good return policy. Large and heavy floorstander (about 96 lbs, 42” tall) requiring real floor space and rear clearance. Positioning is fairly specific: needs about 2 feet from the rear wall - closer causes boominess in the 40-50Hz region, farther loses bass extension. Vertical dispersion (about ±50°) is narrower than horizontal (about ±60°), since the two 8” woofers are spaced vertically apart on a tower cabinet, causing some vertical mismatch at lower frequencies. A small on-axis dip around 500Hz and a deliberately lower tweeter level (about 0.5dB below the midrange) are intentional design choices for smoother in-room response, but mean the raw on-axis measurement isn’t perfectly flat. A mild diffraction-related dip appears around 3kHz in directivity measurements. Toeing the speaker out more than about 10° starts to noticeably reduce top-end energy.
Full MoFi SourcePoint 888 review and specifications →
| Bass Extension (-10dB) | 26Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 34Hz (measured, Erin's Audio Corner) |
| Dimensions | 41.2"H x 12.6"W x 16.1"D (1046.5 x 320 x 408.9 mm) |
| Drivers | Dual 8" paper cone woofers, 8" Paper Cone midrange, 1.25" wide roll soft dome tweeter |
| Impedance | 6 ohms nominal, 5 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin's Audio Corner) |
| Spinorama Preference Score | 5.21 |
| Spinorama Preference Score with Perfect Sub | 6.33 |
| Weight | 94.8 lbs (43 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- MoFi SourcePoint 888 vs MoFi SourcePoint V10 Master Edition
- MoFi SourcePoint 888 vs KEF Blade Two Meta
- MoFi SourcePoint 888 vs Ascend Acoustics ELX Ribbon Tower
- MoFi SourcePoint 888 vs GR-Research NX-Treme
- MoFi SourcePoint 888 vs JBL HDI-3800
- MoFi SourcePoint 888 vs Revel F328Be
- MoFi SourcePoint 888 vs KEF R5 Meta
- MoFi SourcePoint 888 vs KEF R5
- See all 35 comparisons