Short answer: the Ascend Acoustics Sierra-2EX V2 on measured sound quality, the XTZ Spirit 4 on price. The Ascend Acoustics Sierra-2EX V2 ranks #42 of 216 bookshelf speakers, rated 4.3/5, at $1,748. The XTZ Spirit 4 ranks #154, rated 3.4/5, at $477, $1,271 cheaper.
The Ascend Acoustics Sierra-2EX V2 is the more accurate option. A RAAL true ribbon tweeter is paired with a custom SEAS Excel Curv woofer, with the crossover optimized against Klippel NFS measurement data. Its measured preference score, a predictor of how neutral it sounds, is 5.88 against 4.18 for the XTZ Spirit 4. 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 case for the XTZ Spirit 4: Substantial 6.5-inch stand-mount with a waveguided dome tweeter, adjustable treble level and port tuning. Watch for: The third-party measurement is low confidence.
Buy the Ascend Acoustics Sierra-2EX V2 if sound quality is the priority over the price, or the XTZ Spirit 4 if the price is the priority over sound quality.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Ascend Acoustics Sierra-2EX V2 | XTZ Spirit 4 | |
|---|---|---|
| Price | $1,748 per pair | $477 per pair |
| Ranked | #42 of 216 in Large Size Bookshelf Speakers | #154 of 216 in Large Size Bookshelf Speakers |
| Enclosure | ported | 2-way passive, rear-ported |
| Drivers | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer | 1” dome tweeter, 6.5” woofer |
| Dimensions | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) | 13.8H x 7.5W x 10.6D in |
| Weight | 20.1 lbs (9.1 kg) each | 17.9 lbs (8.1 kg) each |
| Sensitivity | 85dB @ 2.83V/1m anechoic (manufacturer) | 86dB |
| Impedance | 8 ohms nominal | 4 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) | 42Hz (manufacturer specified) |
| Bass Extension (-10dB) | 42.4Hz (measured, spinorama.org vendor data) | about 40.0Hz (measured, Spinorama data) |
| Warranty | 7 years parts and labor | - |
| Country | United States | - |
| Spinorama Preference Score | 5.88 | 4.18 |
| Spinorama Preference Score with Perfect Sub | 7.95 | 6.30 |
| DIY Kit | No | No |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared. The two were measured by different sources, so small differences, especially in the bass, can come from the measurement setup rather than the speakers.
Measurement data: Ascend Acoustics Sierra-2EX V2 (measured by the manufacturer) and XTZ Spirit 4 (measured by an independent reviewer), via spinorama.org.
Related Speaker Comparisons
How Ascend Acoustics Sierra-2EX V2 compares with other leading options:
- Ascend Acoustics Sierra-2EX V2 vs Perlisten S4b
- Ascend Acoustics Sierra-2EX V2 vs KEF Reference 1 Meta
- Ascend Acoustics Sierra-2EX V2 vs GR-Research NX-Studio
- AsciLab C6B vs Ascend Acoustics Sierra-2EX V2
- Audio First Cadentia 3 vs Ascend Acoustics Sierra-2EX V2
Prices on this page were last checked October 12, 2026 at 4:13 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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The Two Speakers In Full
Ascend Acoustics Sierra-2EX V2: $1,748 per pair Ascend Acoustics $1,748 eBay
Older model: the Ascend Acoustics Sierra 2 (ranked lower, rated 3.7/5). See every Ascend Sierra generation.
Same family: the Ascend Acoustics Sierra 1 v2 (smaller bookshelf, rated 4.7/5), the Ascend Acoustics Sierra-LX (larger bookshelf, ranked higher, rated 4.3/5), the Ascend Acoustics Sierra Titan Tower (floorstanding, rated 4.4/5) and the Ascend Acoustics Sierra Horizon V2 (center, estimated 4.3/5).
Pros: A RAAL true ribbon tweeter is paired with a custom SEAS Excel Curv woofer, with the crossover optimized against Klippel NFS measurement data. Listening window smoothness measures 0.45, a moderate but usable figure for a compact standmount. Pairs are hand matched within +/-1.5dB and shipped with their own individual frequency response printout, backed by a 7 year parts and labor warranty from direct USA assembly in Orange County, California. Measured bass extension of 58.6Hz (-3dB).
Cons: 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. Bass extension is modest for the price class at a measured 51.3Hz at -6dB. Ascend sells direct only, with no dealer network or third party retailers for an in person audition.
Full Ascend Acoustics Sierra-2EX V2 review and specifications →
| Released | Sep 2022 (4 years ago) |
|---|---|
| Bass Extension (-10dB) | 42.4Hz (measured, spinorama.org vendor data) |
| Bass Extension (-3dB) | 58.6Hz (measured, spinorama.org vendor data) |
| Bass Extension (-6dB) | 51.3Hz (measured, spinorama.org vendor data) |
| Country | United States |
| DIY Kit | No |
| Dimensions | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) |
| Drivers | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer |
| Enclosure | ported |
| Frequency Response | 51-27,000Hz +/-3dB (manufacturer) |
| Impedance | 8 ohms nominal |
| Power Handling | 150W continuous, 300W peak |
| Sensitivity | 85dB @ 2.83V/1m anechoic (manufacturer) |
| Spinorama Preference Score | 5.88 |
| Spinorama Preference Score with Perfect Sub | 7.95 |
| Warranty | 7 years parts and labor |
| Weight | 20.1 lbs (9.1 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ascend Acoustics Sierra-2EX V2 vs Selah Audio Integrity
- Ascend Acoustics Sierra-2EX V2 vs Philharmonic BMR (v1)
- Ascend Acoustics Sierra-2EX V2 vs Revel M126Be
- Ascend Acoustics Sierra-2EX V2 vs Ascend Acoustics Sierra-LX
- Ascend Acoustics Sierra-2EX V2 vs Wharfedale Linton 85
- Ascend Acoustics Sierra-2EX V2 vs Emotiva Airmotiv XB2
- Ascend Acoustics Sierra-2EX V2 vs ELAC Debut 3.0 DB63
- Ascend Acoustics Sierra-2EX V2 vs Perlisten A3m
- See all 46 comparisons
XTZ Spirit 4: $477 per pair XTZ $477 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 6.30 preference score with a subwoofer. Measured bass extension of 40.0Hz (-10dB).
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 4.18 raw preference score.
Full XTZ Spirit 4 review and specifications →
| Bass Extension (-10dB) | about 40.0Hz (measured, Spinorama data) |
|---|---|
| Bass Extension (-3dB) | 42Hz (manufacturer specified) |
| DIY Kit | No |
| 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 | 4.18 |
| Spinorama Preference Score with Perfect Sub | 6.30 |
| Weight | 17.9 lbs (8.1 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons