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. A compact bookshelf speaker with very neutral, flat sound, a wide soundstage, and surprisingly deep bass in a bamboo cabinet. 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): A large three way bookshelf speaker with a ribbon tweeter, flat response, broad coverage, and an unusually expansive midrange. 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.
A compact bookshelf speaker with very neutral, flat sound, a wide soundstage, and surprisingly deep bass in a bamboo cabinet.
A large three way bookshelf speaker with a ribbon tweeter, flat response, broad coverage, and an unusually expansive midrange.
Prices on this page were last checked October 31, 2026 at 7:11 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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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) |
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