Short answer: the Ascend Acoustics CBM-170 SE2. It ranks #113 of 222 bookshelf speakers by sound quality, rated 3.8/5, at $468; the Polk R200 ranks #178, rated 3.2/5, and costs $799, which makes this an easy call rather than a real tradeoff.
Why pick the Polk R200: A Polk bookshelf speaker with a 6.5 inch woofer and a ring radiator tweeter, sized for a medium room. The catch: A resonance and associated distortion increase around 800Hz-1kHz creates a “tinny,” occasionally glaring quality on certain instruments and vocals, confirmed both by ear and in the frequency-response and distortion measurements.
The Ascend Acoustics CBM-170 SE2 is the more accurate choice. 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 5.09 for the Polk R200. The catch: 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.
Buy the Ascend Acoustics CBM-170 SE2. It is rated higher for sound quality than the Polk R200 and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Passive Home rankings cover every ranked option.
A Polk bookshelf speaker with a 6.5 inch woofer and a ring radiator tweeter, sized for a medium room.
Compact two-way bookshelf speakers with a SEAS tweeter, a very flat midrange and smooth sound that suits most rooms.
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
| Polk R200 | Ascend Acoustics CBM-170 SE2 | |
|---|---|---|
| Price | $799.00 per pair | $468 per pair |
| Ranked | #178 of 222 in Large Size Bookshelf Speakers | #113 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 50Hz (measured, Erin’s Audio Corner) | 50Hz (measured, manufacturer spinorama data) |
| Bass Extension (-3dB) | 74Hz (measured, Erin’s Audio Corner) | 70Hz (measured, manufacturer spinorama data) |
| Impedance | 4 ohms nominal, 3.8 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms |
| Sensitivity | 85dB | 86.8dB (2.83V/1m, measured, manufacturer spinorama data; 87dB manufacturer specified) |
| Drivers | 25mm soft dome + 165mm woofer | 27mm custom SEAS soft dome tweeter, 6.5” proprietary composite polygel cone woofer |
| Weight | 31.3 lbs (14.2 kg) | 15 lbs (6.8 kg) each |
| Dimensions | 14.1”H x 7.5”W x 13.9”D (359.0 x 190.0 x 353.8 mm) | 12H x 9W x 9.5D in |
| Woofer Cabinet | ported, rear | ported, rear |
| Spinorama Preference Score | 5.09 | 6.30 |
| Spinorama Preference Score with Perfect Sub | 7.61 | 8.66 |
| DIY Kit | No | No |
| Power Handling | - | 200W continuous, 400W peak |
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