Short answer: the AsciLab F6Bs. It ranks #20 of 222 bookshelf speakers by sound quality (rated 4.5/5); the Klipsch RP-600M II ranks #123 (rated 3.7/5).
The Klipsch RP-600M II is the deeper-bass choice. Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals. Its bass reaches about 70Hz before falling 3dB, against 82Hz for the AsciLab F6Bs. 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 AsciLab F6Bs is the better-sounding pick. A slim, sealed bookshelf speaker that mounts flat on a wall bracket, with accurate sound and wide, even dispersion for a great price. Watch for: AsciLab’s own site shows the F6Bs sold out, though it remains in stock through resellers like Audiophonics and Tested Audio.
Buy the AsciLab F6Bs. It is rated higher for sound quality than the Klipsch RP-600M II.
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 slim, sealed bookshelf speaker that mounts flat on a wall bracket, with accurate sound and wide, even dispersion for a great 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
| Klipsch RP-600M II | AsciLab F6Bs | |
|---|---|---|
| Price | $449.99 per pair | €799 per pair |
| Ranked | #123 of 222 in Large Size Bookshelf Speakers | #20 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) | 50.1Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 82.0Hz (measured, Audio Science Review) |
| Dimensions | 15.7”H x 8”W x 12.5”D (398.8 x 203.2 x 317.5 mm) | 14.5”H x 8”W x 6.1”D (368 x 203 x 154 mm) |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 4 ohms nominal, 3.7 ohms minimum |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 85.2dB @ 2.83V/1m (measured, Audio Science Review) |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | 1” aluminum dome tweeter with waveguide and phase plug, 6” fiber cone woofer |
| Weight | 13 lbs (5.9 kg) each | 12.3 lbs (5.6 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 5.64 | 5.24 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 7.90 |
| DIY Kit | No | No |
| Enclosure | - | sealed |
| Crossover Frequency | - | 1kHz |
| Mounting | - | VESA 100 wall mount compatible |
| Warranty | - | 2 years |
| Country | - | South Korea |
| Maximum SPL | - | 100dB full bandwidth, 102dB above 100Hz (manufacturer specified) |
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