XTZ Spirit 4 vs MoFi SourcePoint 8

Last updated: September 16, 2026

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 130 bookshelf speakers at $2594. The XTZ Spirit 4 ranks #92 at $477, $2117 cheaper.

XTZ Spirit 4 vs MoFi SourcePoint 8

What the XTZ Spirit 4 offers: Substantial 6.5-inch stand-mount with a waveguided dome tweeter, adjustable treble level and port tuning. Spinorama predicts 44Hz in-room extension, broad roughly +/-60-degree horizontal coverage and a 5.39 preference score with a subwoofer. Watch for: The third-party measurement is low confidence. On-axis smoothness is only 0.248, directivity-index consistency is middling at 3.21, and the mildly downward -0.29dB/octave tonal slope contributes to a modest 3.27 raw preference score.

What the MoFi SourcePoint 8 offers: 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. Watch for: 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.

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.

Buy the MoFi SourcePoint 8 at Crutchfield ($2594) →Buy the XTZ Spirit 4 at XTZ ($477/pair) →

Specifications Side By Side

XTZ Spirit 4 MoFi SourcePoint 8
Price$477 per pair$2594 per pair
Ranked#92 of 130 in Large Size Bookshelf Speakers#17 of 130 in Large Size Bookshelf Speakers
Enclosure2-way passive, rear-ported-
Drivers1" dome tweeter, 6.5" woofer8" woofer, 1.25-inch soft-dome tweeter
Dimensions13.8H x 7.5W x 10.6D in18"H x 11.4"W x 13.2"D (457.2 x 289.6 x 335.3 mm)
Weight17.9 lbs (8.1 kg) each28 lbs (12.7 kg) each
Sensitivity86dB86.3dB (measured, Erin's Audio Corner)
Impedance4 ohms8 ohms nominal (8 ohms minimum above 80Hz, measured, Erin's Audio Corner)
Spinorama Preference Score3.274.39
Spinorama Preference Score with Perfect Sub5.396.53
Bass Extension (-10dB)-43Hz (measured, Erin's Audio Corner)
Bass Extension (-3dB)-52Hz (measured, Erin's Audio Corner)
Woofer Cabinet-ported, rear
Buy the MoFi SourcePoint 8 at Crutchfield ($2594) →Buy the XTZ Spirit 4 at XTZ ($477/pair) →

More worthwhile head-to-heads for MoFi SourcePoint 8:

Prices on this page were last checked September 16, 2026 at 12:41 AM 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

XTZ Spirit 4: $477 per pair XTZ eBay

XTZ Spirit 4 ranking card

Pros: Substantial 6.5-inch stand-mount with a waveguided dome tweeter, adjustable treble level and port tuning. Spinorama predicts 44Hz in-room extension, broad roughly +/-60-degree horizontal coverage and a 5.39 preference score with a subwoofer.

Cons: The third-party measurement is low confidence. On-axis smoothness is only 0.248, directivity-index consistency is middling at 3.21, and the mildly downward -0.29dB/octave tonal slope contributes to a modest 3.27 raw preference score.

Full XTZ Spirit 4 review and specifications →

Dimensions13.8H x 7.5W x 10.6D in
Drivers1" dome tweeter, 6.5" woofer
Enclosure2-way passive, rear-ported
Impedance4 ohms
Sensitivity86dB
Spinorama Preference Score3.27
Spinorama Preference Score with Perfect Sub5.39
Weight17.9 lbs (8.1 kg) each
Check current price at XTZ ($477/pair) →Search eBay for XTZ Spirit 4 →

MoFi SourcePoint 8: $2594 per pair Crutchfield eBay

MoFi SourcePoint 8 ranking card

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)
Dimensions18"H x 11.4"W x 13.2"D (457.2 x 289.6 x 335.3 mm)
Drivers8" woofer, 1.25-inch soft-dome tweeter
Impedance8 ohms nominal (8 ohms minimum above 80Hz, measured, Erin's Audio Corner)
Sensitivity86.3dB (measured, Erin's Audio Corner)
Spinorama Preference Score4.39
Spinorama Preference Score with Perfect Sub6.53
Weight28 lbs (12.7 kg) each
Woofer Cabinetported, rear
Check current price at Crutchfield ($2594) →Search eBay for MoFi SourcePoint 8 →