Short answer: the JBL Studio 630. It ranks #56 of 100 bookshelf speakers by sound quality at $699; the Dynaudio Special Forty ranks #61 and costs $3600, so there is not much of a tradeoff to weigh.
The case for the JBL Studio 630: Excellent directivity linearity: harmonics of the same instrument stay collocated in the soundstage instead of drifting between positions, giving precise. The tradeoff: Noticeable mid-range dip/scoop relative to the higher frequencies - not dramatic, but audibly “missing” something by the second or third track.
On the Dynaudio Special Forty side: Smooth, “buttery” overall tonal character consistent with Dynaudio’s house sound. Set against that: 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.
Buy the JBL Studio 630. It ranks higher for sound quality than the Dynaudio Special Forty and costs less, so there is no real case for the other one.
Specifications Side By Side
| JBL Studio 630 | Dynaudio Special Forty | |
|---|---|---|
| Price | $699 | $3600 |
| Ranked | #56 of 100 in Large Size Bookshelf Speakers | #61 of 100 in Large Size Bookshelf Speakers |
| Drivers | 6.5" PolyPlas cone woofer, 1" compression driver (2414H-1) with waveguide | 5.9" MSP (Magnesium Silicate Polymer) cone woofer, 1" Esotar soft dome tweeter |
| Dimensions | 14-13/16"H x 9"W x 11-5/16"D | 14.1"H x 7.7"W x 12.1"D (358.1 x 195.6 x 307.3 mm) |
| Weight | 19.9 lbs each | 17.9 lbs / 8.1 kg each |
| Impedance | 6 ohms nominal, 4.7 ohms minimum (measured, Erin’s Audio Corner) | 6 ohms nominal (4.9 ohms minimum above 80Hz, measured, Erin’s Audio Corner) |
| Sensitivity | 83.2dB (measured, Erin’s Audio Corner; 85dB manufacturer specified) | 83.5dB (measured, Erin’s Audio Corner; 86dB manufacturer specified) |
| Frequency Response | 45Hz - 40,000Hz (manufacturer specified) | - |
| Power Handling | up to 150W | - |
| Bass Extension (-10dB) | - | 39Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | - | 54Hz (measured, Erin’s Audio Corner) |
| Woofer Cabinet | - | ported |
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More useful head-to-heads from the same speaker class:
- Buchardt S400 MKII vs Philharmonic BMR Monitor
- JTR Noesis 210HT vs McIntosh XR50
- ELAC Debut 2.0 B6.2 vs GR-Research NX-Studio
- Dynaudio Special Forty vs SVS Prime Bookshelf
- Dynaudio Special Forty vs Polk R200
The Two Speakers In Full
JBL Studio 630: $699 Amazon
Pros: Excellent directivity linearity: harmonics of the same instrument stay collocated in the soundstage instead of drifting between positions, giving precise, stable imaging that holds up well into higher frequencies where many speakers start to beam and narrow. Good compression behavior - mid-bass stays taut and controlled from low to high volume without the sound falling apart or distorting as you turn it up. A pleasant, controlled mid-bass bump in the 60-100 Hz range adds punch to kick drums without bleeding into an uncontrolled boom on bass guitar. Horizontal radiation holds steady off-axis (about ±60°), so toe-in isn’t fussy. Compared directly to its predecessor, the JBL Studio 530, the reviewer would pick the 630 - smoother trend line through the upper mids and treble, and likely more dynamic headroom - as long as you’re willing to EQ.
Cons: Noticeable mid-range dip/scoop relative to the higher frequencies - not dramatic, but audibly “missing” something by the second or third track. Some tracks read as forward or aggressive around 2 kHz, like the upper frequencies are jumping out at you rather than sitting in stage depth. Needs EQ to bring the mid-range back up to be fully recommendable; without EQ available, the reviewer says he’d look at a different speaker entirely. Measured sensitivity (about 83.2dB) runs noticeably below the 85dB manufacturer spec, likely a byproduct of the mid-range dip skewing the average downward.
Full JBL Studio 630 review and specifications →
| Dimensions | 14-13/16"H x 9"W x 11-5/16"D |
|---|---|
| Drivers | 6.5" PolyPlas cone woofer, 1" compression driver (2414H-1) with waveguide |
| Frequency Response | 45Hz - 40,000Hz (manufacturer specified) |
| Impedance | 6 ohms nominal, 4.7 ohms minimum (measured, Erin's Audio Corner) |
| Power Handling | up to 150W |
| Sensitivity | 83.2dB (measured, Erin's Audio Corner; 85dB manufacturer specified) |
| Weight | 19.9 lbs each |
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- Links
- Reviews, Comparisons and Sound Samples
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- JBL Studio 630 vs Behringer B2030P
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Dynaudio Special Forty: $3600 Safeandsoundhq
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.
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) |
| Weight | 17.9 lbs / 8.1 kg each |
| Woofer Cabinet | ported |
As an eBay Partner, we may be compensated if you make a purchase.
- 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 Polk Monitor XT20
- Dynaudio Special Forty vs Behringer B2030P
- Dynaudio Special Forty vs Sonus Faber Lumina II
- Dynaudio Special Forty vs Focal Aria 906
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