Short answer: the Klipsch RP-600M II for better sound quality, the Infinity IL10 for the lower price. The Klipsch RP-600M II ranks #53 of 100 bookshelf speakers at $489.99. The Infinity IL10 ranks #59 at $160, $329.99 cheaper.
The case for the Klipsch RP-600M II: Redesigned waveguide extends flush to the baffle edge, reducing diffraction compared to the original RP-600M. The tradeoff: On-axis, the treble runs notably hot - even hotter than the original RP-600M in some respects - and needs about 20° of toe-out or the grille installed to sound balanced.
What the Infinity IL10 gets right: Impressively flat for a budget bookshelf. The catch: Resonances at 600 and 5khz, which show up as distinct distortion spikes at 96dB SPL/1m in the same frequency regions.
Buy the Klipsch RP-600M II if sound quality matters more than the price. Buy the Infinity IL10 if the price matters more than sound quality.
Specifications Side By Side
| Klipsch RP-600M II | Infinity IL10 | |
|---|---|---|
| Price | $489.99 | $160 used, Discontinued |
| Ranked | #53 of 100 in Large Size Bookshelf Speakers | #59 of 100 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) | 59Hz (measured, Audio Science Review) |
| Dimensions | 15.7"H x 8"W x 12.5"D (398.8 x 203.2 x 317.5 mm) | 15.6"H x 8.5"W x 11.5"D (397.0 x 216.0 x 292.0 mm) |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 6 ohms |
| Sensitivity | 86dB (measured, Erin’s Audio Corner) | 86dB (measured, Audio Science Review) |
| Drivers | 6.5" Cerametallic cone woofer, 1" titanium LTS vented tweeter with Tractrix horn | 6.5" (165mm) woofer |
| Weight | 13 lbs / 5.9 kg each | 14.3 lbs / 6.5 kg |
| Woofer Cabinet | ported | ported, rear |
| Discontinued | - | Yes |
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The Two Speakers In Full
Klipsch RP-600M II: $489.99 Amazon
Pros: Redesigned waveguide extends flush to the baffle edge, reducing diffraction compared to the original RP-600M. Roughly 10-20° wider horizontal radiation than the original, giving more soundstage envelopment while retaining precise imaging. A major step up in overall tonal neutrality compared to the original RP-600M, largely eliminating that model’s midrange resonance issues. Unusually, sounds better with the grille on - the grille smooths out the elevated treble rather than degrading the sound, a rare trait among speakers the reviewer has tested. More refined back-panel hardware, including anodized binding posts and jumper cables for optional bi-amping. Responds well to EQ correction (verified using measurement software and a miniDSP), letting the on-axis response be made genuinely linear.
Cons: On-axis, the treble runs notably hot - even hotter than the original RP-600M in some respects - and needs about 20° of toe-out or the grille installed to sound balanced. Horizontal dispersion is very slightly less linear across angles than the original RP-600M, a minor trade-off for the wider overall radiation pattern. Klipsch’s marketed sensitivity (about 94.5dB) is, like the original, a half-space rating roughly 9dB above the anechoic reality (closer to 85-86dB). In-room bass rolls off around 60Hz in practice, and a 120Hz boost paired with a midrange scoop gives kick drums their “tambour” without real low-end weight - a subwoofer is still recommended. Vertical listening tolerance is limited to about ±10° from the tweeter axis. Toeing the speaker out for better on-axis tonality (rather than using the grille) introduces slightly more diffuse imaging from added sidewall reflections.
Full Klipsch RP-600M II review and specifications →
| Bass Extension (-10dB) | 41Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 70Hz (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) |
| Drivers | 6.5" Cerametallic cone woofer, 1" titanium LTS vented tweeter with Tractrix horn |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin's Audio Corner) |
| Sensitivity | 86dB (measured, Erin's Audio Corner) |
| Weight | 13 lbs / 5.9 kg each |
| Woofer Cabinet | ported |
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- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: The Truth about Klipsch’s “NEW” Sound. RP-600M Update.
- Erin’s Audio Corner Website Klipsch RP-600M II
- GR-Research: We Bought The “NEW” RP-600M II Is KLIPSCH Listening?!
- Erin’s Audio Corner: 5 AWESOME SPEAKERS Under $1000 You Won’t Regret
- Reddit Search for Klipsch RP-600M II Review
- Head-to-Head Comparisons
- Klipsch RP-600M II vs Dynaudio Emit 20
- Klipsch RP-600M II vs Infinity Reference R162
- Klipsch RP-600M II vs JBL Studio 630
- Klipsch RP-600M II vs Behringer B2030P
- Klipsch RP-600M II vs SVS Ultra Bookshelf
- Klipsch RP-600M II vs Dynaudio Special Forty
- Klipsch RP-600M II vs Dynaudio Contour 20i
- Klipsch RP-600M II vs ELAC Debut 2.0 B6.2
- See all 16 comparisons
Infinity IL10: $160 used, Discontinued
Pros: Impressively flat for a budget bookshelf. Predicted in-room response is good aside from a bit of excess energy here and there. Distortion at 96dB SPL/1m stays low and controlled outside two narrow resonance-driven peaks.
Cons: Resonances at 600 and 5khz, which show up as distinct distortion spikes at 96dB SPL/1m in the same frequency regions. Discontinued.
Full Infinity IL10 review and specifications →
| Bass Extension (-10dB) | 44Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 59Hz (measured, Audio Science Review) |
| Dimensions | 15.6"H x 8.5"W x 11.5"D (397.0 x 216.0 x 292.0 mm) |
| Discontinued | Yes |
| Drivers | 6.5" (165mm) woofer |
| Impedance | 6 ohms |
| Sensitivity | 86dB (measured, Audio Science Review) |
| Weight | 14.3 lbs / 6.5 kg |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Infinity IL10 vs Behringer B2030P
- Infinity IL10 vs Dynaudio Special Forty
- Infinity IL10 vs ELAC Debut 2.0 B6.2
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