Short answer: the Perlisten S4b if sound quality matters most, the Ascend Acoustics CBM-170 SE2 if price matters most. The Perlisten S4b ranks #2 of 222 bookshelf speakers, rated 4.8/5, at $8,000. The Ascend Acoustics CBM-170 SE2 ranks #113, rated 3.8/5, at $468, $7,532 cheaper.
The Ascend Acoustics CBM-170 SE2 is the more accurate, deeper-bass option. Compact two-way bookshelf speakers with a SEAS tweeter, a very flat midrange and smooth sound that suits most rooms. Its measured preference score, a predictor of how neutral it sounds, is 6.30 against 5.35 for the Perlisten S4b. Its bass reaches about 70Hz before falling 3dB, against 78Hz for the Perlisten S4b. Watch for: A narrow dip in the on-axis and listening-window response appears in the 3-5kHz range (down to about -2.7dB), mirrored by a matching dip in the directivity index at the same frequencies: likely a brief widening of dispersion right at the tweeter/woofer crossover.
The Perlisten S4b is the better-sounding pick. A compact sealed bookshelf speaker with reference grade accuracy, exceptionally smooth dispersion, and very low distortion at high volume. The tradeoff: Erin measured only 84.5dB sensitivity and an impedance minimum just under 4 ohms, a difficult efficiency/load combination that deserves substantial clean amplification.
Buy the Ascend Acoustics CBM-170 SE2 if the price matters more than sound quality. Buy the Perlisten S4b if sound quality matters more than the price.
Looking for alternatives? See the complete Passive Home rankings.
Compact two-way bookshelf speakers with a SEAS tweeter, a very flat midrange and smooth sound that suits most rooms.
A compact sealed bookshelf speaker with reference grade accuracy, exceptionally smooth dispersion, and very low distortion at high volume.
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 CBM-170 SE2 | Perlisten S4b | |
|---|---|---|
| Price | $468 per pair | $8,000 per pair |
| Ranked | #113 of 222 in Large Size Bookshelf Speakers | #2 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | 70Hz (measured, manufacturer spinorama data) | 78Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 50Hz (measured, manufacturer spinorama data) | 40Hz (measured, Erin’s Audio Corner) |
| Sensitivity | 86.8dB (2.83V/1m, measured, manufacturer spinorama data; 87dB manufacturer specified) | 84.5dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Drivers | 27mm custom SEAS soft dome tweeter, 6.5” proprietary composite polygel cone woofer | DPC array with 28mm beryllium tweeter and dual 28mm midrange domes; 7” woofer |
| Dimensions | 12H x 9W x 9.5D in | 16.5”H x 9.4”W x 7.3”D |
| Weight | 15 lbs (6.8 kg) each | 24.3 lbs (11 kg) each |
| Impedance | 8 ohms | Just under 4 ohms minimum (measured, Erin’s Audio Corner) |
| Power Handling | 200W continuous, 400W peak | - |
| Woofer Cabinet | ported, rear | sealed |
| Spinorama Preference Score | 6.30 | 5.35 |
| Spinorama Preference Score with Perfect Sub | 8.66 | 8.01 |
| DIY Kit | No | No |
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