Short answer: the AsciLab C6B, on value and bass extension. The GR-Research NX-Studio posts an ultra clean burst decay and waterfall plot, but its sealed woofer enclosure means bass is very tight without being as deep as others, at $3630 versus $1145 for the C6B. The C6B’s own bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed below that either way.
What the AsciLab C6B gets right: Two-way design pairing a 1” aluminum ceramic dome tweeter on a large waveguide with a 6” aluminum ceramic cone woofer. The tradeoff: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that.
On the GR-Research NX-Studio side: Ultra clean burst decay/waterfall plot. The catch: Bass will be very tight but won’t be quite as deep as others due to the sealed woofer enclosure.
Buy the AsciLab C6B if the price is the priority over sound quality, or the GR-Research NX-Studio if sound quality is the priority over the price.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| AsciLab C6B | GR-Research NX-Studio | |
|---|---|---|
| Price | $1145 per pair | $3630 per pair |
| Ranked | #7 of 130 in Large Size Bookshelf Speakers | #4 of 130 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin's Audio Corner) | - |
| Bass Extension (-3dB) | 54Hz (measured, Erin's Audio Corner) | - |
| Dimensions | 15.7"H x 8"W x 10.4"D (398.8 x 203.2 x 264.2 mm) | 18"H x 8.5"W x 15.5"D (457.2 x 215.9 x 393.7 mm) |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin's Audio Corner) | 8 ohms |
| Sensitivity | 85.6dB (measured, Erin's Audio Corner) | 87dB |
| Drivers | 6" Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1" Aluminium Ceramic 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 | 18.5 lbs (8.4 kg) each | 20.5 lbs (9.3 kg) each |
| Woofer Cabinet | passive radiator | sealed |
| Spinorama Preference Score | 5.66 | - |
| Spinorama Preference Score with Perfect Sub | 7.60 | - |
| DIY Kit | No | Yes |
Related Speaker Comparisons
How GR-Research NX-Studio compares with other leading options:
- GR-Research NX-Studio vs Perlisten S4b
- GR-Research NX-Studio vs KEF Reference 1 Meta
- GR-Research NX-Studio vs March Audio Sointuva AWG
- Audio First Cadentia 3 vs GR-Research NX-Studio
- KEF R3 Meta vs GR-Research NX-Studio
Prices on this page were last checked September 23, 2026 at 11:24 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
AsciLab C6B: $1145 per pair Ascilab eBay
Pros: Two-way design pairing a 1” aluminum ceramic dome tweeter on a large waveguide with a 6” aluminum ceramic cone woofer, crossed over at 1.1kHz, plus a rear passive radiator. Unusual trait: horizontal radiation actually widens at higher frequencies instead of narrowing like most two-way designs, which keeps image focus and soundstage depth consistent whether you toe the speakers in or out (5-10° off-axis was the sweet spot in testing). Vertical radiation also stays wide straight through the 2kHz crossover region, so the sound doesn’t collapse when standing up - unusual at this price. CA2034 measurements show strong on-axis linearity, listening window, early reflections, and directivity. Midrange and tweeter distortion stay very low even at 96dB, holding up against a $5,900 Arendal speaker in that regard despite roughly a 5x price gap. At $935 (about $1,135 shipped to the US), the reviewer calls it the best-value bookshelf speaker he’s tested, rivaling speakers 2-5x the price. Measured bass extension of 54Hz (-3dB), with a measured sensitivity of 85.6dB.
Cons: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that. Low-frequency harmonic distortion increases substantially at 96dB versus 86dB, though it’s second-order and less audible than it looks on paper. Minimum impedance dips to 2.6 ohms (EPDR as low as 1.2 ohms), so it wants an amplifier comfortable driving 4-ohm loads, ideally 100W or more. At 102dB, compression noticeably eats into midrange, bass, and some treble output. Shipping to the US adds roughly $200 on top of the $935 price. Against the reviewer’s reference Audiofirst Fidelia at a similar price, has slightly less lower-midrange body (about 1dB difference) and a smaller perceived soundstage size.
Full AsciLab C6B review and specifications →
| Bass Extension (-10dB) | 35Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 54Hz (measured, Erin's Audio Corner) |
| DIY Kit | No |
| Dimensions | 15.7"H x 8"W x 10.4"D (398.8 x 203.2 x 264.2 mm) |
| Drivers | 6" Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1" Aluminium Ceramic Dome tweeter |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin's Audio Corner) |
| Spinorama Preference Score | 5.66 |
| Spinorama Preference Score with Perfect Sub | 7.60 |
| Weight | 18.5 lbs (8.4 kg) each |
| Woofer Cabinet | passive radiator |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
GR-Research NX-Studio: $3630 per pair Gr-research eBay
Pros: Ultra clean burst decay/waterfall plot. Amazingly open sounding due to the semi open baffle Neo3 ribbon tweeter, will image better than any other bookshelf speaker. Neo3 ribbon tweeter is one of the best ribbons around for detail. Bass will be very tight and fast due to the sealed enclosure, but may possibly need a sub.
Cons: Bass will be very tight but won’t be quite as deep as others due to the sealed woofer enclosure.
Full GR-Research NX-Studio review and specifications →
| DIY Kit | Yes |
|---|---|
| Dimensions | 18"H x 8.5"W x 15.5"D (457.2 x 215.9 x 393.7 mm) |
| Drivers | 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 |
| Impedance | 8 ohms |
| Sensitivity | 87dB |
| Weight | 20.5 lbs (9.3 kg) each |
| Woofer Cabinet | sealed |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- GR-Research NX-Studio vs KEF Reference 1 Meta
- GR-Research NX-Studio vs March Audio Sointuva AWG
- GR-Research NX-Studio vs Perlisten S4b
- GR-Research NX-Studio vs Audio First Cadentia 3
- GR-Research NX-Studio vs KEF R3 Meta
- GR-Research NX-Studio vs KEF Q Concerto Meta
- GR-Research NX-Studio vs Wharfedale Aura 2
- GR-Research NX-Studio vs KEF R3
- See all 48 comparisons