Short answer: the AsciLab F6B. It ranks #12 of 222 bookshelf speakers by sound quality, rated 4.6/5, at $980. The Klipsch RP-600M II ranks #123, rated 3.7/5, at $449.99, $530.01 cheaper, not enough of a saving to outweigh the sound-quality gap.
What the Klipsch RP-600M II does well: 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 AsciLab F6B is the more accurate, deeper-bass option. A great value bookshelf speaker with accurate, well balanced sound and punchy midbass that gives kick drums extra impact. Its measured preference score, a predictor of how neutral it sounds, is 6.32 against 5.64 for the Klipsch RP-600M II. Its bass reaches about 56Hz before falling 3dB, against 70Hz for the Klipsch RP-600M II. The catch: A mild sibilance-inducing lift around 6-8kHz, most noticeable on female vocals, paired with a shallow dip in the upper midrange: correctable with a simple 3-band EQ the reviewer provided.
Buy the AsciLab F6B. It is rated higher for sound quality, and saving $530.01 with the Klipsch RP-600M II does not make up for the sound-quality gap.
Want more options? Browse the full Passive Home rankings.
Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals.
A great value bookshelf speaker with accurate, well balanced sound and punchy midbass that gives kick drums extra impact.
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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Klipsch RP-600M II | AsciLab F6B | |
|---|---|---|
| Price | $449.99 per pair | $980 per pair |
| Ranked | #123 of 222 in Large Size Bookshelf Speakers | #12 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) | 56Hz (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) | 15.7” x 8” x 10.4” (400 x 203 x 265 mm) |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 4 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 85dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | 1” aluminum dome tweeter, 6” fiber cone woofer |
| Weight | 13 lbs (5.9 kg) each | 16.5 lbs (7.5 kg) each |
| Woofer Cabinet | ported | Passive radiator loaded |
| Spinorama Preference Score | 5.64 | 6.32 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 8.26 |
| DIY Kit | No | No |
| Crossover Frequency | - | 1000Hz |
| Recommended Power | - | up to 125W |
Related Speaker Comparisons
More worthwhile head-to-heads for AsciLab F6B: