Short answer: the GR-Research NX-Studio. It ranks #4 of 222 bookshelf speakers by sound quality, rated 4.8/5, at $3,630. The Dynaudio Special Forty ranks #148, rated 3.5/5, at $3,600, $30 cheaper, not enough of a saving to outweigh the sound-quality gap.
The case for the Dynaudio Special Forty: Premium bookshelf speakers with strong output, wide dispersion and fairly deep bass from a compact rear ported cabinet. The tradeoff: 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.
The GR-Research NX-Studio is the better-sounding option. A DIY kit bookshelf speaker with a ribbon tweeter for wide open, detailed sound, superb imaging, and tight, fast sealed bass. Watch for: Bass will be very tight but won’t be quite as deep as others due to the sealed woofer enclosure.
Buy the GR-Research NX-Studio. It is rated higher for sound quality, and saving $30 with the Dynaudio Special Forty does not make up for the sound-quality gap.
Looking for alternatives? See the complete Passive Home rankings.
Premium bookshelf speakers with strong output, wide dispersion and fairly deep bass from a compact rear ported cabinet.
A DIY kit bookshelf speaker with a ribbon tweeter for wide open, detailed sound, superb imaging, and tight, fast sealed bass.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| Dynaudio Special Forty | GR-Research NX-Studio | |
|---|---|---|
| Price | $3600 per pair | $3630 per pair |
| Ranked | #148 of 222 in Large Size Bookshelf Speakers | #4 of 222 in Large Size Bookshelf Speakers |
| 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) | 18”H x 8.5”W x 15.5”D (457.2 x 215.9 x 393.7 mm) |
| Impedance | 6 ohms nominal (4.9 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 8 ohms |
| Sensitivity | 83.5dB (measured, Erin’s Audio Corner; 86dB manufacturer specified) | 87dB |
| Drivers | 5.9” MSP (Magnesium Silicate Polymer) cone woofer, 1” Esotar soft dome tweeter | GR-Research M165NQ 6.5” paper cone, non-resonant polymer frame, copper shorting rings and aluminum phase plug sealed enclosure woofer, GR-Research Neo3 Planar Magnetic Ribbon open baffle tweeter |
| Weight | 17.9 lbs (8.1 kg) each | 20.5 lbs (9.3 kg) each |
| Woofer Cabinet | ported | sealed |
| Spinorama Preference Score | 4.73 | - |
| Spinorama Preference Score with Perfect Sub | 6.74 | - |
| DIY Kit | No | Yes |
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