Short answer: the Ascend Acoustics Sierra-2EX V2 if sound quality matters most, the Klipsch RP-600M II if price matters most. The Ascend Acoustics Sierra-2EX V2 ranks #41 of 222 bookshelf speakers, rated 4.3/5, at $1,748. The Klipsch RP-600M II ranks #123, rated 3.7/5, at $449.99, $1,298.01 cheaper.
The case for the Klipsch RP-600M II: Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals. Watch for: On-axis, the treble runs notably hot (even hotter than the original Klipsch RP-600M in some respects) and needs about 20° of toe-out or the grille installed to sound balanced.
The Ascend Acoustics Sierra-2EX V2 is the better-sounding, deeper-bass option. A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty. Its bass reaches about 58.6Hz before falling 3dB, against 70Hz for the Klipsch RP-600M II. The tradeoff: On-axis response is relatively uneven, with an average deviation of about 0.45dB, so a listener sitting dead center may notice more unevenness than with smoother AsciLab or Ascend towers.
Buy the Klipsch RP-600M II if the price matters more than sound quality. Buy the Ascend Acoustics Sierra-2EX V2 if sound quality matters more than the price.
Still deciding? The full Passive Home rankings cover every ranked option.
Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals.
A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty.
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
| Klipsch RP-600M II | Ascend Acoustics Sierra-2EX V2 | |
|---|---|---|
| Price | $449.99 per pair | $1,748 per pair |
| Ranked | #123 of 222 in Large Size Bookshelf Speakers | #41 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) | 42.4Hz (measured, spinorama.org vendor data) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 58.6Hz (measured, spinorama.org vendor data) |
| Dimensions | 15.7”H x 8”W x 12.5”D (398.8 x 203.2 x 317.5 mm) | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 8 ohms nominal |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 85dB @ 2.83V/1m anechoic (manufacturer) |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer |
| Weight | 13 lbs (5.9 kg) each | 20.1 lbs (9.1 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 5.64 | 5.88 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 7.95 |
| DIY Kit | No | No |
| Enclosure | - | ported |
| Power Handling | - | 150W continuous, 300W peak |
| Frequency Response | - | 51-27,000Hz +/-3dB (manufacturer) |
| Bass Extension (-6dB) | - | 51.3Hz (measured, spinorama.org vendor data) |
| Warranty | - | 7 years parts and labor |
| Country | - | United States |
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