Short answer: the AsciLab C6B for a more neutral top end, the Polk Monitor XT20 if the budget rules. The XT20 pairs a 1” tweeter with a 6.5” woofer, but its treble is notably bright, sitting roughly 1-5dB above the midrange depending on frequency, a trait shared across the whole Polk XT line. The C6B costs $1,145 versus $277.50, and its 1” aluminum ceramic dome and 6” ceramic cone woofer roll off around 50Hz in-room.
Buy the AsciLab C6B if sound quality is the priority over the price, or the Polk Monitor XT20 if the price is the priority over sound quality.
Want more options? Browse the full Passive Home rankings.
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Specifications Side By Side
| AsciLab C6B | Polk Monitor XT20 | |
|---|---|---|
| Price | $1145 per pair | $277.50 per pair |
| Ranked | #6 of 222 in Large Size Bookshelf Speakers | #157 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 43.4Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 54Hz (measured, Erin’s Audio Corner) | 64.5Hz (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) | 13”H x 7.5”W x 11”D (330.2 x 190.5 x 279.4 mm) |
| Impedance | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal (measured, Erin’s Audio Corner) |
| Sensitivity | 85.6dB (measured, Erin’s Audio Corner) | 86dB (measured by Erin’s Audio Corner; 87dB manufacturer specified) |
| Drivers | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter | 6.5” bilaminate paper cone woofer, 1” Terylene dome tweeter |
| Weight | 18.5 lbs (8.4 kg) each | 11.9 lbs (5.4 kg) each |
| Woofer Cabinet | passive radiator | ported |
| Spinorama Preference Score | 6.33 | 4.71 |
| Spinorama Preference Score with Perfect Sub | 8.28 | 7.07 |
| DIY Kit | No | No |
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