Short answer: the GR-Research NX-Studio if sound quality matters most, the XTZ Spirit 4 if price matters most. The GR-Research NX-Studio ranks #4 of 130 bookshelf speakers at $3630. The XTZ Spirit 4 ranks #92 at $477, $3153 cheaper.
What the XTZ Spirit 4 offers: Substantial 6.5-inch stand-mount with a waveguided dome tweeter, adjustable treble level and port tuning. Spinorama predicts 44Hz in-room extension, broad roughly +/-60-degree horizontal coverage and a 5.39 preference score with a subwoofer. Watch for: The third-party measurement is low confidence. On-axis smoothness is only 0.248, directivity-index consistency is middling at 3.21, and the mildly downward -0.29dB/octave tonal slope contributes to a modest 3.27 raw preference score.
What the GR-Research NX-Studio offers: 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. Watch for: Bass will be very tight but won’t be quite as deep as others due to the sealed woofer enclosure.
Buy the XTZ Spirit 4 when the price outweighs sound quality for you, and the GR-Research NX-Studio when sound quality outweighs the price instead.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| XTZ Spirit 4 | GR-Research NX-Studio | |
|---|---|---|
| Price | $477 per pair | $3630 per pair |
| Ranked | #92 of 130 in Large Size Bookshelf Speakers | #4 of 130 in Large Size Bookshelf Speakers |
| Enclosure | 2-way passive, rear-ported | - |
| Drivers | 1" dome tweeter, 6.5" 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 | 13.8H x 7.5W x 10.6D in | 18"H x 8.5"W x 15.5"D (457.2 x 215.9 x 393.7 mm) |
| Weight | 17.9 lbs (8.1 kg) each | 20.5 lbs (9.3 kg) each |
| Sensitivity | 86dB | 87dB |
| Impedance | 4 ohms | 8 ohms |
| Spinorama Preference Score | 3.27 | - |
| Spinorama Preference Score with Perfect Sub | 5.39 | - |
| Woofer Cabinet | - | sealed |
Related Speaker Comparisons
More worthwhile head-to-heads for GR-Research NX-Studio:
- 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
- AsciLab C6B vs GR-Research NX-Studio
- Audio First Cadentia 3 vs GR-Research NX-Studio
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
XTZ Spirit 4: $477 per pair XTZ eBay
Pros: Substantial 6.5-inch stand-mount with a waveguided dome tweeter, adjustable treble level and port tuning. Spinorama predicts 44Hz in-room extension, broad roughly +/-60-degree horizontal coverage and a 5.39 preference score with a subwoofer.
Cons: The third-party measurement is low confidence. On-axis smoothness is only 0.248, directivity-index consistency is middling at 3.21, and the mildly downward -0.29dB/octave tonal slope contributes to a modest 3.27 raw preference score.
Full XTZ Spirit 4 review and specifications →
| Dimensions | 13.8H x 7.5W x 10.6D in |
|---|---|
| Drivers | 1" dome tweeter, 6.5" woofer |
| Enclosure | 2-way passive, rear-ported |
| Impedance | 4 ohms |
| Sensitivity | 86dB |
| Spinorama Preference Score | 3.27 |
| Spinorama Preference Score with Perfect Sub | 5.39 |
| Weight | 17.9 lbs (8.1 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- XTZ Spirit 4 vs Sonus Faber Lumina II
- XTZ Spirit 4 vs KEF Q3 Meta
- XTZ Spirit 4 vs SVS Prime Bookshelf
- XTZ Spirit 4 vs ELAC Debut 2.0 B6.2
- XTZ Spirit 4 vs Polk R200
- XTZ Spirit 4 vs Dynaudio Special Forty
- XTZ Spirit 4 vs GR-Research X-LS Encore
- XTZ Spirit 4 vs Sonus Faber Sonetto II G2
- See all 44 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 →
| 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 AsciLab C6B
- 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
- See all 48 comparisons