Short answer: the AsciLab C6B. It ranks #6 of 222 bookshelf speakers by sound quality, rated 4.7/5, at $1,145; the Philharmonic BMR Monitor ranks #134, rated 3.6/5, and costs $2,200, so there is little reason to consider the other one.
The AsciLab C6B is the better-sounding option. Two-way design pairing a 1” aluminum ceramic dome tweeter on a large waveguide with a 6” aluminum ceramic cone woofer, crossed over at 1.1kHz, plus a rear passive radiator. The catch: Bass rolls off around 50Hz in-room (F3 54Hz, F10 35Hz), so a subwoofer is needed for real extension below that.
The Philharmonic BMR Monitor is the deeper-bass pick. Three-way design combining a 6” SB Acoustics mid-woofer, a 2.5” Tectonic balanced-mode radiator (BMR) for the midrange, and a ribbon tweeter: premium component choices relative to the asking price. Its bass reaches about 47Hz before falling 3dB, against 54Hz for the AsciLab C6B. The catch: A 1-2dB bump around 2-3kHz creates a “glare” on vocals, guitars, and strings that the reviewer noticed consistently across many tracks.
Buy the AsciLab C6B. It is rated higher for sound quality than the Philharmonic BMR Monitor and costs less, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Passive Home rankings.
Two-way design pairing a 1” aluminum ceramic dome tweeter on a large waveguide with a 6” aluminum ceramic cone woofer, crossed over at 1.1kHz, plus a rear passive radiator.
Ascilab $1145 eBay
Three-way design combining a 6” SB Acoustics mid-woofer, a 2.5” Tectonic balanced-mode radiator (BMR) for the midrange, and a ribbon tweeter: premium component choices relative to the asking price.
Philharmonic Audio $2200 eBayPrices on this page were last checked October 17, 2026 at 6:04 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
| AsciLab C6B | Philharmonic BMR Monitor | |
|---|---|---|
| Price | $1145 per pair | $2200 per pair |
| Ranked | #6 of 222 in Large Size Bookshelf Speakers | #134 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 32Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 47Hz (measured, Erin’s Audio Corner) |
| Dimensions | 15.7”H x 8”W x 10.4”D (398.8 x 203.2 x 264.2 mm) | 20”H x 8”W x 12.5”D (508 x 203.2 x 317.5 mm) |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) | 4 ohms nominal (3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin’s Audio Corner) | 84dB (measured, Erin’s Audio Corner) |
| Drivers | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter | 6” Ceramic woofer, Balanced Mode Radiator 2.5” midrange, RAAL 64-10X OEM tweeter |
| Weight | 18.5 lbs (8.4 kg) each | 32 lbs (14.5 kg) each |
| Woofer Cabinet | passive radiator | ported, rear |
| Spinorama Preference Score | 6.33 | 6.02 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 8.28 | 7.67 (spinorama.org) |
| 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.
Measurement data: AsciLab C6B (measured by Erin’s Audio Corner) and Philharmonic BMR Monitor (measured by Erin’s Audio Corner), via spinorama.org.
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