Short answer: the MoFi SourcePoint 8 if sound quality matters most, the XTZ Spirit 4 if price matters most. The MoFi SourcePoint 8 ranks #17 of 222 bookshelf speakers, rated 4.5/5, at $2,594. The XTZ Spirit 4 ranks #159, rated 3.4/5, at $477, $2,117 cheaper.
The case for the XTZ Spirit 4: Stand-mount speakers with a waveguide tweeter, adjustable treble and port tuning, wide coverage and fairly deep bass. The catch: The third-party measurement is low confidence.
The MoFi SourcePoint 8 is the more accurate pick. A bookshelf speaker with an 8 inch concentric driver, neutral sound, excellent imaging, and wide dispersion that forgives placement. Its measured preference score, a predictor of how neutral it sounds, is 5.15 against 4.18 for the XTZ Spirit 4. 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.
Buy the XTZ Spirit 4 if the price is the priority over sound quality, or the MoFi SourcePoint 8 if sound quality is the priority over the price.
Still deciding? The full Passive Home rankings cover every ranked option.
Stand-mount speakers with a waveguide tweeter, adjustable treble and port tuning, wide coverage and fairly deep bass.
A bookshelf speaker with an 8 inch concentric driver, neutral sound, excellent imaging, and wide dispersion that forgives placement.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| XTZ Spirit 4 | MoFi SourcePoint 8 | |
|---|---|---|
| Price | $477 per pair | $2594 per pair |
| Ranked | #159 of 222 in Large Size Bookshelf Speakers | #17 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | about 40.0Hz (measured, Spinorama data) | 43Hz (measured, Erin’s Audio Corner) |
| Enclosure | 2-way passive, rear-ported | - |
| Drivers | 1” dome tweeter, 6.5” woofer | 8” woofer, 1.25-inch soft-dome tweeter |
| Dimensions | 13.8H x 7.5W x 10.6D in | 18”H x 11.4”W x 13.2”D (457.2 x 289.6 x 335.3 mm) |
| Weight | 17.9 lbs (8.1 kg) each | 28 lbs (12.7 kg) each |
| Sensitivity | 86dB | 86.3dB (measured, Erin’s Audio Corner) |
| Impedance | 4 ohms | 8 ohms nominal (8 ohms minimum above 80Hz, measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.18 | 5.15 |
| Spinorama Preference Score with Perfect Sub | 6.30 | 7.28 |
| Bass Extension (-3dB) | 42Hz (manufacturer specified) | 52Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No | No |
| Woofer Cabinet | - | ported, rear |
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