Short answer: the Dynaudio Special Forty for the more even top end, though it has its own 3-4kHz glare. The Polk Monitor XT20 is a two-way with a 1” tweeter and 6.5” woofer, but its treble is notably bright, elevated roughly 1-5dB above the midrange, a trait shared across the whole XT lineup that needs EQ or toe-out. The Special Forty’s smooth, buttery character is undercut by a glaring 3-4kHz quality. They are $3,321 apart.
Buy the Dynaudio Special Forty if sound quality is the priority over the price, or the Polk Monitor XT20 if the price is the priority over sound quality.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| Dynaudio Special Forty | Polk Monitor XT20 | |
|---|---|---|
| Price | $3600 per pair | $279.00 per pair |
| Ranked | #88 of 134 in Large Size Bookshelf Speakers | #93 of 134 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 39Hz (measured, Erin’s Audio Corner) | 43.4Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 64.5Hz (measured, Erin’s Audio Corner) |
| Dimensions | 14.1”H x 7.7”W x 12.1”D (358.1 x 195.6 x 307.3 mm) | 13”H x 7.5”W x 11”D (330.2 x 190.5 x 279.4 mm) |
| Impedance | 6 ohms nominal (4.9 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 8 ohms nominal (measured, Erin’s Audio Corner) |
| Sensitivity | 83.5dB (measured, Erin’s Audio Corner; 86dB manufacturer specified) | 86dB (measured by Erin’s Audio Corner; 87dB manufacturer specified) |
| Drivers | 5.9” MSP (Magnesium Silicate Polymer) cone woofer, 1” Esotar soft dome tweeter | 6.5” bilaminate paper cone woofer, 1” Terylene dome tweeter |
| Weight | 17.9 lbs (8.1 kg) each | 11.9 lbs (5.4 kg) each |
| Woofer Cabinet | ported | ported |
| Spinorama Preference Score | 4.73 | 4.71 |
| Spinorama Preference Score with Perfect Sub | 6.74 | 7.07 |
| DIY Kit | No | No |
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Prices on this page were last checked October 2, 2026 at 10:18 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
Dynaudio Special Forty: $3600 per pair Safe and Sound HQ eBay
Pros: Smooth, “buttery” overall tonal character consistent with Dynaudio’s house sound. Surprisingly precise, focused imaging despite wide horizontal radiation (about ±70°): atypical, since wide-radiating speakers usually sacrifice some image precision in reflective rooms. Strong output capability: reached 100-101dB average at 3.5 meters with no audible distortion or woofer distress, and compression testing at 102dB shows the cabinet holding up mechanically well at extreme output. Bass reaches a genuine 50Hz (potentially 40Hz) in most rooms from a rear-ported design. Distortion stays below 1% at 86dB and doesn’t cross 3% THD until about 50Hz even at 96dB. Extra weight and impact on snares and percussion around 700-800Hz that the reviewer found appealing on many tracks. Measured bass extension of 54Hz (-3dB), with a measured sensitivity of 83.5dB.
Cons: A glaring, sometimes sibilant quality around 3-4kHz was the most noticeable issue in listening, the one thing the reviewer would want notched out with EQ. Multiple enclosure resonances appear between 500Hz-1kHz across on-axis, listening window, early-reflections, and sound-power measurements, corroborated by independent third-party CSD data showing similar 500-800Hz cabinet resonances. A dip around 1.2kHz traces to a cone-edge-to-surround compliance mismatch in the driver itself (confirmed by testing the bare driver’s impedance): a known artifact common to many similarly-sized drivers across several manufacturers, contributing to elevated second-order distortion in that region. A somewhat laid-back, recessed 1-2kHz character (sometimes described as a “BBC dip”) gives an overall subdued quality that isn’t overtly problematic but shapes the tonal balance. Impedance drops below 3 ohms in the 100-200Hz region, requiring a genuinely 4-ohm-stable amplifier rather than an AVR. Rear port means it can’t be placed directly against a wall.
Full Dynaudio Special Forty review and specifications →
| Bass Extension (-10dB) | 39Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 14.1”H x 7.7”W x 12.1”D (358.1 x 195.6 x 307.3 mm) |
| Drivers | 5.9” MSP (Magnesium Silicate Polymer) cone woofer, 1” Esotar soft dome tweeter |
| Impedance | 6 ohms nominal (4.9 ohms minimum above 80Hz, measured, Erin’s Audio Corner) |
| Sensitivity | 83.5dB (measured, Erin’s Audio Corner; 86dB manufacturer specified) |
| Spinorama Preference Score | 4.73 |
| Spinorama Preference Score with Perfect Sub | 6.74 |
| Weight | 17.9 lbs (8.1 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
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Polk Monitor XT20: $279.00 per pair Amazon Crutchfield eBay
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. Measured bass extension of 64.5Hz (-3dB), with a measured sensitivity of 86dB.
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) | 43.4Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 64.5Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 13”H x 7.5”W x 11”D (330.2 x 190.5 x 279.4 mm) |
| Drivers | 6.5” bilaminate paper cone woofer, 1” Terylene dome tweeter |
| Impedance | 8 ohms nominal (measured, Erin’s Audio Corner) |
| Sensitivity | 86dB (measured by Erin’s Audio Corner; 87dB manufacturer specified) |
| Spinorama Preference Score | 4.71 |
| Spinorama Preference Score with Perfect Sub | 7.07 |
| Weight | 11.9 lbs (5.4 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Polk’s new budget XT Speakers. Reviewed! More from Erin’s Audio Corner →
- Erin’s Audio Corner Website Polk Monitor XT20
- Erin’s Audio Corner: 10 Great (and Terrible) Speakers Under $300!
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- Erin’s Audio Corner Measurements (spinorama.org)
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