Short answer: the KEF R3 for better sound quality, the Ascend Acoustics CMT-340 SE2 for the lower price. The KEF R3 ranks #15 of 222 bookshelf speakers, rated 4.5/5, at $1,544.56. The Ascend Acoustics CMT-340 SE2 ranks #24, rated 4.4/5, at $798, $746.56 cheaper.
The KEF R3 is the more accurate, deeper-bass option. A three way bookshelf speaker with KEF’s coaxial driver for stable imaging across seats and very low distortion, easy to run with a modest amp. Its measured preference score, a predictor of how neutral it sounds, is 6.20 against 5.33 for the Ascend Acoustics CMT-340 SE2. Its bass reaches about 58Hz before falling 3dB, against 77.6Hz for the Ascend Acoustics CMT-340 SE2. The tradeoff: The low-frequency alignment rolls gradually rather than delivering high-output sub-bass; KEF specifies 58Hz +/-3dB and Erin’s high-level data supports using an 80Hz subwoofer crossover.
The case for the Ascend Acoustics CMT-340 SE2: A dual woofer bookshelf speaker with accurate sound, high sensitivity, and lots of clean output, a superb partner for a subwoofer at a modest price. Watch for: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 5.33.
Buy the KEF R3 when sound quality outweighs the price for you, and the Ascend Acoustics CMT-340 SE2 when the price outweighs sound quality instead.
Still deciding? The full Passive Home rankings cover every ranked option.
A three way bookshelf speaker with KEF’s coaxial driver for stable imaging across seats and very low distortion, easy to run with a modest amp.
A dual woofer bookshelf speaker with accurate sound, high sensitivity, and lots of clean output, a superb partner for a subwoofer at a modest price.
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
| KEF R3 | Ascend Acoustics CMT-340 SE2 | |
|---|---|---|
| Price | $1,544.56 per pair | $798 per pair |
| Ranked | #15 of 222 in Large Size Bookshelf Speakers | #24 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | Approximately 58Hz (manufacturer specified; consistent with Erin’s measured roll-off) | 77.6Hz (measured, spinorama.org) |
| Bass Extension (-10dB) | 35.2Hz (measured, Audio Science Review) | approximately 53Hz (measured, spinorama.org) |
| Sensitivity | Approximately 86-87dB/2.83V/1m (measured, Erin’s Audio Corner) | 92dB at 2.83V/1m anechoic |
| Impedance | 8 ohms nominal; suitable for Erin’s 4/8-ohm-rated amplifier | 8 ohms nominal |
| Drivers | 1” tweeter coaxial with 5” midrange; 6.5” woofer | Two 6.5-inch woofers; 27mm soft-dome tweeter |
| Dimensions | 16.6”H x 7.9”W x 13.2”D | 21 x 7.5 x 10.5 in each |
| Woofer Cabinet | ported, rear Flexible Port | - |
| Weight | 29.9 lbs (13.55 kg) each | 29.1 lbs (13.2 kg) each |
| Spinorama Preference Score | 6.2 (spinorama.org) | 5.33 |
| Spinorama Preference Score with Perfect Sub | 7.97 (spinorama.org) | 7.99 |
| DIY Kit | No | No |
| Power Handling | - | 240W continuous; 400W short-term peak |
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