Short answer: the Ascend Acoustics Sierra-LX, if you are buying new. The Philharmonic BMR (v1) measures as well as it (#40 vs #37 of 222 bookshelf speakers, 4.3/5 vs 4.3/5) but is discontinued, so only consider it used; the Ascend Acoustics Sierra-LX is still sold new at $1,598. The Philharmonic BMR (v1)’s replacement, the Philharmonic BMR Monitor, is rated 3.6/5 at $2,200.
The Ascend Acoustics Sierra-LX is the more accurate, deeper-bass pick. Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip. Its measured preference score, a predictor of how neutral it sounds, is 6.63 against 4.86 for the Philharmonic BMR (v1). Its bass reaches about 47Hz before falling 3dB, against 62Hz for the Philharmonic BMR (v1). The catch: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
Why pick the Philharmonic BMR (v1): Large three-way combining a Scan-Speak 7-inch paper/carbon woofer, 2.5-inch Tectonic balanced-mode midrange and RAAL 64-10 ribbon. Watch for: The measured 83dB sensitivity and roughly 4-ohm load demand meaningful external amplification.
Buy the Ascend Acoustics Sierra-LX, since the Philharmonic BMR (v1) is discontinued and only worth hunting down used.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Ascend Acoustics Sierra-LX | Philharmonic BMR (v1) | |
|---|---|---|
| Price | $1598 per pair | $2,395 per pair Discontinued |
| Ranked | #37 of 222 in Large Size Bookshelf Speakers | #40 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) | 37.8Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) | Approximately 62Hz relative to mean (measured, Erin’s Audio Corner website) |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) | 22H x 9W x 13.5D in |
| Impedance | 8 ohms nominal (5.5 ohms minimum) | Approximately 4 ohms nominal (measured, Erin’s Audio Corner) |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) | Approximately 83dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter | RAAL 64-10 ribbon; 2.5” BMR midrange; 7” Scan-Speak woofer |
| Weight | 20.9 lbs (9.5 kg) | 37.9 lbs (17.2 kg) each |
| Woofer Cabinet | Bass reflex, flared rear port | ported |
| Power Handling | 350W continuous, 500W peak | - |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) | - |
| Country | USA | - |
| Spinorama Preference Score | 6.63 | 4.86 |
| Spinorama Preference Score with Perfect Sub | 8.44 | 7.17 |
| DIY Kit | No | No |
| Port Tuning | - | Mid/low-30Hz range (measured, Erin’s Audio Corner) |
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-LX (measured by the manufacturer) and Philharmonic BMR (v1) (measured by Erin’s Audio Corner), via spinorama.org.
Related Speaker Comparisons
How Ascend Acoustics Sierra-LX compares with other leading options:
- Ascend Acoustics Sierra-LX vs Perlisten S4b
- Ascend Acoustics Sierra-LX vs KEF Reference 1 Meta
- Ascend Acoustics Sierra-LX vs GR-Research NX-Studio
- AsciLab C6B vs Ascend Acoustics Sierra-LX
- Audio First Cadentia 3 vs Ascend Acoustics Sierra-LX
Prices on this page were last checked October 15, 2026 at 5:41 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-LX: $1598 per pair Ascend Acoustics $1598 eBay
Same family: the Ascend Acoustics Sierra 1 v2 (smaller bookshelf, rated 4.7/5), the Ascend Acoustics Sierra-2EX V2 (smaller bookshelf, ranked lower, 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). See every Ascend Sierra generation.
Pros: Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip. Bass extension down to about 40Hz in-room despite the compact size. Wide, well-balanced soundstage (~60 degrees). Solid build quality with a laminated bamboo cabinet. Measured bass extension of 47Hz (-3dB), with a measured sensitivity of 81dB.
Cons: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels. Noticeable midrange distortion becomes audible above about 82-83dB SPL. A narrow dip around 3.5kHz on-axis in larger rooms without sidewall reflections: toeing the speakers out 10-20 degrees fills it in, but adds some brightness to the treble. Sensitive to listening height: sitting even slightly above or below tweeter level noticeably shifts the tonal balance.
Full Ascend Acoustics Sierra-LX review and specifications →
| Released | Apr 2022 (4 years ago) |
|---|---|
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) |
| Country | USA |
| DIY Kit | No |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) |
| Power Handling | 350W continuous, 500W peak |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 6.63 |
| Spinorama Preference Score with Perfect Sub | 8.44 |
| Weight | 20.9 lbs (9.5 kg) |
| Woofer Cabinet | Bass reflex, flared rear port |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ascend Acoustics Sierra-LX vs Wharfedale Linton 85
- Ascend Acoustics Sierra-LX vs Revel M126Be
- Ascend Acoustics Sierra-LX vs Ascend Acoustics Sierra-2EX V2
- Ascend Acoustics Sierra-LX vs Dynaudio Heritage Special
- Ascend Acoustics Sierra-LX vs Radiant Acoustics Clarity 6.2
- Ascend Acoustics Sierra-LX vs MoFi SourcePoint 10
- Ascend Acoustics Sierra-LX vs Wharfedale Super Linton
- Ascend Acoustics Sierra-LX vs Emotiva Airmotiv XB2
- See all 49 comparisons
Philharmonic BMR (v1): $2,395 per pair Discontinued eBay
Newer model: the Philharmonic BMR Monitor, ranked lower, rated 3.6/5, released 2015. See every Philharmonic BMR generation.
Pros: Large three-way combining a Scan-Speak 7-inch paper/carbon woofer, 2.5-inch Tectonic balanced-mode midrange and RAAL 64-10 ribbon. Erin measured approximately +/-1.5dB linearity from 80Hz upward, very broad +/-40-degree-or-better horizontal coverage and about 83dB/2.83V/1m sensitivity. The port is tuned in the mid/low-30Hz region without audible chuffing, the midrange provides unusually expansive staging, and distortion remained subjectively unobtrusive. Measured bass extension of 62Hz (-3dB), with a measured sensitivity of 83dB.
Cons: The measured 83dB sensitivity and roughly 4-ohm load demand meaningful external amplification. A 1-2dB shelf below about 300Hz reduces warmth unless corrected, while a response/impedance feature near 250-300Hz corresponded with Erin’s sense of resonance. The ribbon produces narrower vertical than horizontal radiation, and second-order high-frequency distortion plus dynamic enhancement near 3kHz appeared in testing. This was an earlier cabinet/version, not the current v2. Discontinued.
Full Philharmonic BMR (v1) review and specifications →
| Released | 2015 (11 years ago) |
|---|---|
| Bass Extension (-10dB) | 37.8Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | Approximately 62Hz relative to mean (measured, Erin’s Audio Corner website) |
| DIY Kit | No |
| Dimensions | 22H x 9W x 13.5D in |
| Drivers | RAAL 64-10 ribbon; 2.5” BMR midrange; 7” Scan-Speak woofer |
| Impedance | Approximately 4 ohms nominal (measured, Erin’s Audio Corner) |
| Port Tuning | Mid/low-30Hz range (measured, Erin’s Audio Corner) |
| Sensitivity | Approximately 83dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.86 |
| Spinorama Preference Score with Perfect Sub | 7.17 |
| Weight | 37.9 lbs (17.2 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Philharmonic BMR (v1) vs ELAC VELA BS 403
- Philharmonic BMR (v1) vs Selah Audio Integrity
- Philharmonic BMR (v1) vs Ascend Acoustics Sierra-2EX V2
- Philharmonic BMR (v1) vs Wharfedale Linton 85
- Philharmonic BMR (v1) vs Selah Audio Purezza
- Philharmonic BMR (v1) vs Emotiva Airmotiv XB2
- Philharmonic BMR (v1) vs ELAC Debut 3.0 DB63
- Philharmonic BMR (v1) vs Arendal 1723 Bookshelf S THX
- See all 49 comparisons