Short answer: the Ascend Acoustics CMT-340 SE2. It ranks #23 of 130 bookshelf speakers by sound quality at $798; the Dynaudio Special Forty ranks #86 and costs $3600, so there is not much of a tradeoff to weigh.
What the Dynaudio Special Forty offers: 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. Watch for: 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.
What the Ascend Acoustics CMT-340 SE2 offers: High-quality manufacturer Klippel NFS data shows 0.295dB on-axis average absolute deviation, 0.531 listening-window smoothness, and a strong 7.17 preference score with a subwoofer. Its dual 6.5-inch woofers, 92dB anechoic sensitivity, and 240W continuous power rating support high output and dynamics. Watch for: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 4.51. The 4.35 sound-power directivity-index standard deviation also indicates more off-axis variation than the strongest designs, and the rear port needs placement clearance.
Buy the Ascend Acoustics CMT-340 SE2. It ranks higher for sound quality than the Dynaudio Special Forty and costs less, which settles it without a real tradeoff to make.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Dynaudio Special Forty | Ascend Acoustics CMT-340 SE2 | |
|---|---|---|
| Price | $3600 per pair | $798 per pair |
| Ranked | #86 of 130 in Large Size Bookshelf Speakers | #23 of 130 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 39Hz (measured, Erin's Audio Corner) | approximately 53Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 54Hz (measured, Erin's Audio Corner) | 77.6Hz (measured, spinorama.org) |
| Dimensions | 14.1"H x 7.7"W x 12.1"D (358.1 x 195.6 x 307.3 mm) | 21 x 7.5 x 10.5 in each |
| Impedance | 6 ohms nominal (4.9 ohms minimum above 80Hz, measured, Erin's Audio Corner) | 8 ohms nominal |
| Sensitivity | 83.5dB (measured, Erin's Audio Corner; 86dB manufacturer specified) | 92dB at 2.83V/1m anechoic |
| Drivers | 5.9" MSP (Magnesium Silicate Polymer) cone woofer, 1" Esotar soft dome tweeter | Two 6.5-inch woofers; 27mm soft-dome tweeter |
| Weight | 17.9 lbs (8.1 kg) each | 29.1 lbs (13.2 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 3.85 | 4.51 |
| Spinorama Preference Score with Perfect Sub | 5.86 | 7.17 |
| Power Handling | - | 240W continuous; 400W short-term peak |
Related Speaker Comparisons
How Ascend Acoustics CMT-340 SE2 compares with other leading options:
- Ascend Acoustics CMT-340 SE2 vs Perlisten S4b
- KEF Reference 1 Meta vs Ascend Acoustics CMT-340 SE2
- Ascend Acoustics CMT-340 SE2 vs GR-Research NX-Studio
- AsciLab C6B vs Ascend Acoustics CMT-340 SE2
- Audio First Cadentia 3 vs Ascend Acoustics CMT-340 SE2
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
Dynaudio Special Forty: $3600 per pair Safeandsoundhq 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) |
| 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 | 3.85 |
| Spinorama Preference Score with Perfect Sub | 5.86 |
| Weight | 17.9 lbs (8.1 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Dynaudio Special Forty vs ELAC Debut 2.0 B6.2
- Dynaudio Special Forty vs SVS Prime Bookshelf
- Dynaudio Special Forty vs Infinity IL10
- Dynaudio Special Forty vs KEF Q3 Meta
- Dynaudio Special Forty vs GR-Research X-LS Encore
- Dynaudio Special Forty vs Polk Monitor XT20
- Dynaudio Special Forty vs Sonus Faber Lumina II
- Dynaudio Special Forty vs XTZ Spirit 4
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Ascend Acoustics CMT-340 SE2: $798 per pair Ascend Acoustics eBay
Pros: High-quality manufacturer Klippel NFS data shows 0.295dB on-axis average absolute deviation, 0.531 listening-window smoothness, and a strong 7.17 preference score with a subwoofer. Its dual 6.5-inch woofers, 92dB anechoic sensitivity, and 240W continuous power rating support high output and dynamics. Measured bass extension of 77.6Hz (-3dB).
Cons: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 4.51. The 4.35 sound-power directivity-index standard deviation also indicates more off-axis variation than the strongest designs, and the rear port needs placement clearance.
Full Ascend Acoustics CMT-340 SE2 review and specifications →
| Bass Extension (-10dB) | approximately 53Hz (measured, spinorama.org) |
|---|---|
| Bass Extension (-3dB) | 77.6Hz (measured, spinorama.org) |
| Dimensions | 21 x 7.5 x 10.5 in each |
| Drivers | Two 6.5-inch woofers; 27mm soft-dome tweeter |
| Impedance | 8 ohms nominal |
| Power Handling | 240W continuous; 400W short-term peak |
| Sensitivity | 92dB at 2.83V/1m anechoic |
| Spinorama Preference Score | 4.51 |
| Spinorama Preference Score with Perfect Sub | 7.17 |
| Weight | 29.1 lbs (13.2 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ascend Acoustics CMT-340 SE2 vs Arendal 1528 Monitor 8
- Ascend Acoustics CMT-340 SE2 vs Wharfedale Super Linton
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- Ascend Acoustics CMT-340 SE2 vs MoFi SourcePoint 10
- Ascend Acoustics CMT-340 SE2 vs Radiant Acoustics Clarity 6.2
- Ascend Acoustics CMT-340 SE2 vs Dynaudio Heritage Special
- Ascend Acoustics CMT-340 SE2 vs MoFi SourcePoint 8
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