Short answer: the Ascend Acoustics Sierra-2EX V2. It ranks #43 of 203 bookshelf speakers by sound quality, rated 4.3/5, at $1,748; the ATC SCM19 ranks #190, rated 2.4/5, and costs $3,750, so there is not much of a tradeoff to weigh.
The Ascend Acoustics Sierra-2EX V2 is the more accurate choice. 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 4.61 for the ATC SCM19. Watch for: 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.
Why pick the ATC SCM19: Harmonic distortion at 96dB SPL/1m stays generally low across the range aside from the spike tied to the 700-800Hz resonance. The tradeoff: Some stored energy resonance around 500-700Hz, 4dB bump around 700Hz.
Buy the Ascend Acoustics Sierra-2EX V2. It is rated higher for sound quality than the ATC SCM19 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| Ascend Acoustics Sierra-2EX V2 | ATC SCM19 | |
|---|---|---|
| Price | $1,748 per pair | $3750 per pair |
| Ranked | #43 of 203 in Large Size Bookshelf Speakers | #190 of 203 in Large Size Bookshelf Speakers |
| Enclosure | ported | - |
| Drivers | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer | 5.9” Super Linear Magnet cone woofer, 1” soft dome tweeter |
| Dimensions | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) | 17.2”H x 10.4”W x 11.8”D (436.9 x 264.2 x 299.7 mm) |
| Weight | 20.1 lbs (9.1 kg) each | 39.2 lbs (17.8 kg) each |
| Sensitivity | 85dB @ 2.83V/1m anechoic (manufacturer) | 85dB (measured, Audio Science Review) |
| Impedance | 8 ohms nominal | 6 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) | 60Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 42.4Hz (measured, spinorama.org vendor data) | 34Hz (measured, Audio Science Review) |
| Warranty | 7 years parts and labor | - |
| Country | United States | - |
| Spinorama Preference Score | 5.88 | 4.61 |
| Spinorama Preference Score with Perfect Sub | 7.95 | 7.03 |
| DIY Kit | No | No |
| Woofer Cabinet | - | sealed |
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 7, 2026 at 9:25 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 eBay
Older model: the Ascend Acoustics Sierra 2 (ranked lower, rated 3.7/5).
Same family: the Ascend 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 →
| 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
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- 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
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ATC SCM19: $3750 per pair The Music Room eBay
Same family: the ATC SCM40 (floorstanding, estimated 2.6/5).
Pros: Harmonic distortion at 96dB SPL/1m stays generally low across the range aside from the spike tied to the 700-800Hz resonance. Sealed (unported) cabinet avoids port noise and resonance, and the extremely dense, heavy-duty enclosure (17.8kg/39lb each) reflects ATC’s pro-audio build standards. Measured bass extension of 60Hz (-3dB), with a measured sensitivity of 85dB.
Cons: Some stored energy resonance around 500-700Hz, 4dB bump around 700Hz. Not recommended for the price. CEA2034 spinorama and predicted in-room response both show a very uneven overall balance (a broad accentuation from midrange to treble paired with too little bass) along with directivity error. At 96dB SPL/1m, harmonic distortion tied to the 500-700Hz resonance rises to a level the reviewer says “should not be there.”
Full ATC SCM19 review and specifications →
| Bass Extension (-10dB) | 34Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 60Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 17.2”H x 10.4”W x 11.8”D (436.9 x 264.2 x 299.7 mm) |
| Drivers | 5.9” Super Linear Magnet cone woofer, 1” soft dome tweeter |
| Impedance | 6 ohms |
| Sensitivity | 85dB (measured, Audio Science Review) |
| Spinorama Preference Score | 4.61 |
| Spinorama Preference Score with Perfect Sub | 7.03 |
| Weight | 39.2 lbs (17.8 kg) each |
| Woofer Cabinet | sealed |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons