Polk Monitor XT20 vs MoFi SourcePoint 8

Last updated: August 24, 2026

Short answer: the MoFi SourcePoint 8 for better sound quality, the Polk Monitor XT20 for the lower price. The MoFi SourcePoint 8 ranks #17 of 125 bookshelf speakers at $2200. The Polk Monitor XT20 ranks #88 at $279, $1921 cheaper.

What the Polk Monitor XT20 offers: Two-way bookshelf design with a 1” tweeter and 6.5” woofer, part of Polk’s budget-friendly XT lineup (spanning roughly $200-700 across the series). Measures more linear and has fewer/smaller cabinet resonances than its smaller sibling, the XT15, making it - by the reviewer’s own assessment - probably the better of the two based on data alone. Reasonably good bass output for the price and size, with an F3 of 63Hz. Horizontal radiation of about ±50° gives a respectable, enjoyable soundstage width. Takes well to EQ correction - the early-reflections directivity trend is decently linear, meaning tonal adjustments can meaningfully improve the sound. Provides usable, respectable volume when paired with a subwoofer crossover, even though it isn’t intended to play extremely loud on its own. Watch for: Notably bright treble, elevated roughly 1-5dB above the midrange depending on frequency - a characteristic shared across the whole Polk XT lineup, requiring either EQ or toe-out to tame. Small resonances appear around 300Hz and 800Hz, with some of that energy leaking from the port area. Vertical listening window is narrow - best kept close to the tweeter axis, with only a couple of degrees of tolerance above or below before the sound changes. Still needs a subwoofer for real low-end extension despite the decent F3. Overall linearity isn’t state-of-the-art flat, and while the reviewer found it pleasant, some artificial brightness remains even after basic EQ correction in the crossover region.

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 Polk Monitor XT20 if the price matters more than sound quality. Buy the MoFi SourcePoint 8 if sound quality matters more than the price.

Buy the MoFi SourcePoint 8 at Crutchfield →Buy the Polk Monitor XT20 at Amazon ($279.00) →

Polk Monitor XT20 vs MoFi SourcePoint 8

Specifications Side By Side

Polk Monitor XT20 MoFi SourcePoint 8
Price$279.00$2200
Ranked#88 of 125 in Large Size Bookshelf Speakers#17 of 125 in Large Size Bookshelf Speakers
Bass Extension (-10dB)50Hz (measured, Erin’s Audio Corner)43Hz (measured, Erin’s Audio Corner)
Bass Extension (-3dB)75Hz (measured, Erin’s Audio Corner)52Hz (measured, Erin’s Audio Corner)
Dimensions13"H x 7.5"W x 11"D (330.2 x 190.5 x 279.4 mm)18"H x 11.4"W x 13.2"D (457.2 x 289.6 x 335.3 mm)
Impedance8 ohms nominal (measured, Erin’s Audio Corner)8 ohms nominal (8 ohms minimum above 80Hz, measured, Erin’s Audio Corner)
Sensitivity86dB (measured by Erin’s Audio Corner; 87dB manufacturer specified)86.3dB (measured, Erin’s Audio Corner)
Drivers6.5" bilaminate paper cone woofer, 1" Terylene dome tweeter8" woofer, 1.25-inch soft-dome tweeter
Weight11.9 lbs / 5.4 kg each28 lbs / 12.7 kg each
Woofer Cabinetportedported, rear
Buy the MoFi SourcePoint 8 at Crutchfield →Buy the Polk Monitor XT20 at Amazon ($279.00) →

More useful head-to-heads from the same speaker class:

Prices on this page were last checked August 24, 2026 at 6:53 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.

As an eBay Partner, we may be compensated if you make a purchase.

The Two Speakers In Full

Polk Monitor XT20: $279.00 Amazon Crutchfield eBay

Polk Monitor XT20 ranking card

Pros: Two-way bookshelf design with a 1” tweeter and 6.5” woofer, part of Polk’s budget-friendly XT lineup (spanning roughly $200-700 across the series). Measures more linear and has fewer/smaller cabinet resonances than its smaller sibling, the XT15, making it - by the reviewer’s own assessment - probably the better of the two based on data alone. Reasonably good bass output for the price and size, with an F3 of 63Hz. Horizontal radiation of about ±50° gives a respectable, enjoyable soundstage width. Takes well to EQ correction - the early-reflections directivity trend is decently linear, meaning tonal adjustments can meaningfully improve the sound. Provides usable, respectable volume when paired with a subwoofer crossover, even though it isn’t intended to play extremely loud on its own.

Cons: Notably bright treble, elevated roughly 1-5dB above the midrange depending on frequency - a characteristic shared across the whole Polk XT lineup, requiring either EQ or toe-out to tame. Small resonances appear around 300Hz and 800Hz, with some of that energy leaking from the port area. Vertical listening window is narrow - best kept close to the tweeter axis, with only a couple of degrees of tolerance above or below before the sound changes. Still needs a subwoofer for real low-end extension despite the decent F3. Overall linearity isn’t state-of-the-art flat, and while the reviewer found it pleasant, some artificial brightness remains even after basic EQ correction in the crossover region.

Full Polk Monitor XT20 review and specifications →

Bass Extension (-10dB)50Hz (measured, Erin's Audio Corner)
Bass Extension (-3dB)75Hz (measured, Erin's Audio Corner)
Dimensions13"H x 7.5"W x 11"D (330.2 x 190.5 x 279.4 mm)
Drivers6.5" bilaminate paper cone woofer, 1" Terylene dome tweeter
Impedance8 ohms nominal (measured, Erin's Audio Corner)
Sensitivity86dB (measured by Erin's Audio Corner; 87dB manufacturer specified)
Weight11.9 lbs / 5.4 kg each
Woofer Cabinetported
Check current price at Amazon ($279.00) →Check current price at Crutchfield →Search eBay for Polk Monitor XT20 →

MoFi SourcePoint 8: $2200 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.

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)
Weight28 lbs / 12.7 kg each
Woofer Cabinetported, rear
Check current price at Crutchfield →Search eBay for MoFi SourcePoint 8 →