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 Ascend Acoustics Sierra-2EX V2 ranks #41, rated 4.3/5, at $1,748, $1,882 cheaper, which does not close the gap in sound quality.
The case for the Ascend Acoustics Sierra-2EX V2: A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty. The tradeoff: On-axis response is relatively uneven, with an average deviation of about 0.45dB, so a listener sitting dead center may notice more unevenness than with smoother AsciLab or Ascend towers.
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. The tradeoff: 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 $1,882 with the Ascend Acoustics Sierra-2EX V2 does not make up for the sound-quality gap.
Still deciding? The full Passive Home rankings cover every ranked option.
A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty.
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
| Ascend Acoustics Sierra-2EX V2 | GR-Research NX-Studio | |
|---|---|---|
| Price | $1,748 per pair | $3630 per pair |
| Ranked | #41 of 222 in Large Size Bookshelf Speakers | #4 of 222 in Large Size Bookshelf Speakers |
| Enclosure | ported | - |
| Drivers | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer | 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 |
| Dimensions | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) | 18”H x 8.5”W x 15.5”D (457.2 x 215.9 x 393.7 mm) |
| Weight | 20.1 lbs (9.1 kg) each | 20.5 lbs (9.3 kg) each |
| Sensitivity | 85dB @ 2.83V/1m anechoic (manufacturer) | 87dB |
| Impedance | 8 ohms nominal | 8 ohms |
| Power Handling | 150W continuous, 300W peak | - |
| Frequency Response | 51-27,000Hz +/-3dB (manufacturer) | - |
| Bass Extension (-6dB) | 51.3Hz (measured, spinorama.org vendor data) | - |
| Bass Extension (-3dB) | 58.6Hz (measured, spinorama.org vendor data) | - |
| Bass Extension (-10dB) | 42.4Hz (measured, spinorama.org vendor data) | - |
| Warranty | 7 years parts and labor | - |
| Country | United States | - |
| Spinorama Preference Score | 5.88 | - |
| Spinorama Preference Score with Perfect Sub | 7.95 | - |
| DIY Kit | No | Yes |
| Woofer Cabinet | - | sealed |
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