Short answer: the Ascend Acoustics Sierra-LX if sound quality matters most, the Klipsch RP-600M II if price matters most. The Ascend Acoustics Sierra-LX ranks #37 of 222 bookshelf speakers, rated 4.3/5, at $1,598. The Klipsch RP-600M II ranks #123, rated 3.7/5, at $449.99, $1,148.01 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. The catch: 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-LX is the more accurate, deeper-bass choice. A compact bookshelf speaker with very neutral, flat sound, a wide soundstage, and surprisingly deep bass in a bamboo cabinet. Its measured preference score, a predictor of how neutral it sounds, is 6.63 against 5.64 for the Klipsch RP-600M II. Its bass reaches about 47Hz before falling 3dB, against 70Hz for the Klipsch RP-600M II. The tradeoff: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
Buy the Klipsch RP-600M II if the price matters more than sound quality. Buy the Ascend Acoustics Sierra-LX 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 compact bookshelf speaker with very neutral, flat sound, a wide soundstage, and surprisingly deep bass in a bamboo cabinet.
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-LX | |
|---|---|---|
| Price | $449.99 per pair | $1598 per pair |
| Ranked | #123 of 222 in Large Size Bookshelf Speakers | #37 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 47Hz (measured, Erin’s Audio Corner) |
| Dimensions | 15.7”H x 8”W x 12.5”D (398.8 x 203.2 x 317.5 mm) | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 8 ohms nominal (5.5 ohms minimum) |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 81dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | 6” aluminum cone woofer, 26mm dome tweeter |
| Weight | 13 lbs (5.9 kg) each | 20.9 lbs (9.5 kg) |
| Woofer Cabinet | ported | Bass reflex, flared rear port |
| Spinorama Preference Score | 5.64 | 6.63 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 8.44 |
| DIY Kit | No | No |
| Power Handling | - | 350W continuous, 500W peak |
| Frequency Response | - | 28Hz - 23kHz (in-room, manufacturer specified) |
| Country | - | USA |
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