Short answer: the Klipsch RP-600M II. It ranks #124 of 223 bookshelf speakers by sound quality, rated 3.7/5, at $449.99; the GR-Research X-LS Encore ranks #147, rated 3.5/5, and costs $1,300, which makes this an easy call rather than a real tradeoff.
The Klipsch RP-600M II is the more accurate choice. Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals. Its measured preference score, a predictor of how neutral it sounds, is 5.64 against 5.05 for the GR-Research X-LS Encore. 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.
Why pick the GR-Research X-LS Encore: Two-way bookshelf speakers with a Peerless woofer, also sold as a kit so builders can save money by assembling them. The catch: A slight depression in the upper bass and some peaking in the lower bass shows up on-axis, along with directivity error in the crossover region.
Buy the Klipsch RP-600M II. It is rated higher for sound quality than the GR-Research X-LS Encore and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Passive Home rankings.
Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals.
Two-way bookshelf speakers with a Peerless woofer, also sold as a kit so builders can save money by assembling them.
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Specifications Side By Side
| Klipsch RP-600M II | GR-Research X-LS Encore | |
|---|---|---|
| Price | $449.99 per pair | $1300 per pair |
| Ranked | #124 of 223 in Large Size Bookshelf Speakers | #147 of 223 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin’s Audio Corner) | 44Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 64Hz (measured, Audio Science Review) |
| Dimensions | 15.7”H x 8”W x 12.5”D (398.8 x 203.2 x 317.5 mm) | 13.5”H x 8.5”W x 12.1”D (342.9 x 215.9 x 308 mm) |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 8 ohms |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 84.4dB (measured by Audio Science Review on the kit; 87dB manufacturer specified) |
| Drivers | 6.5” Cerametallic cone woofer, 1” titanium LTS vented tweeter with Tractrix horn | 6.5” Peerless M-165 paper composite cone, non-resonant polymer frame woofer, 1” Peerless India T26SG tweeter |
| Weight | 13 lbs (5.9 kg) each | 17 lbs (7.7 kg) each |
| Woofer Cabinet | ported | ported |
| Spinorama Preference Score | 5.64 | 5.05 (measured, spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.77 | 7.42 (measured, spinorama.org) |
| DIY Kit | No | - |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared. The two were measured by different sources, so small differences, especially in the bass, can come from the measurement setup rather than the speakers.
Measurement data: Klipsch RP-600M II (measured by Erin’s Audio Corner) and GR-Research X-LS Encore (measured by Audio Science Review), via spinorama.org.
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