Short answer: the Klipsch RP-600M II. It ranks #74 of 130 bookshelf speakers by sound quality at $449.99; the Tannoy Revolution XT 6 ranks #115 and costs $1100, so there is not much of a tradeoff to weigh.
What the Klipsch RP-600M II offers: 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. Watch for: 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.
What the Tannoy Revolution XT 6 offers: Horizontal directivity is very good outside of a narrow glitch around 2.5kHz, meaning the coaxial design’s off-axis sound closely tracks on-axis within a +/-50 degree toe-in window. Vertical response is notably better than a typical non-coaxial 2-way thanks to the concentric driver, and the downward-firing, base-integrated port is a distinctive, functional piece of industrial design. Watch for: CEA2034 spinorama shows significant on-axis dips and rising amplitude above 3kHz, and distortion measurements are the headline problem - 4-5% distortion at 96dB SPL in the most sensitive part of the audible band, far higher than the Revel M106 comparison unit at the same level. Careful multi-notch EQ improved things but never fully resolved it. The reviewer’s conclusion: “I can’t recommend the Tannoy XT 6” - the coaxial design’s distortion should have been addressed by the designer, not patched after the fact with EQ.
Buy the Klipsch RP-600M II. It ranks higher for sound quality than the Tannoy Revolution XT 6 and costs less, so there is no real case for the other one.
The Tannoy Revolution XT 6 is not a sound-quality pick. It sits near the bottom of the 130 bookshelf speakers; there are better options higher up.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Klipsch RP-600M II | Tannoy Revolution XT 6 | |
|---|---|---|
| Price | $449.99 per pair | $1100 per pair |
| Ranked | #74 of 130 in Large Size Bookshelf Speakers | #115 of 130 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin's Audio Corner) | 60Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 70Hz (measured, Erin's Audio Corner) | 85Hz (measured, Audio Science Review) |
| Dimensions | 15.7"H x 8"W x 12.5"D (398.8 x 203.2 x 317.5 mm) | 15.8H x 8.7W x 11.9D in |
| Impedance | 8 ohms nominal (3.5 ohms minimum above 80Hz, measured by Erin's Audio Corner) | 8 ohms nominal |
| Sensitivity | 86dB (measured, Erin's Audio Corner) | 86.5dB (2.83V/1m, measured, Audio Science Review) |
| Drivers | 6.5" Cerametallic cone woofer, 1" titanium LTS vented tweeter with Tractrix horn | 6" dual-concentric multifiber-cone woofer with coaxial 1" PEI dome tweeter |
| Weight | 13 lbs (5.9 kg) each | 16.5 lbs (7.5 kg) each |
| Woofer Cabinet | ported | ported, bottom-firing |
| Spinorama Preference Score | 4.75 | 1.52 |
| Spinorama Preference Score with Perfect Sub | 6.88 | 4.04 |
| Power Handling | - | 25-120W recommended, 240W peak |
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The Two Speakers In Full
Klipsch RP-600M II: $449.99 per pair Amazon eBay
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. Measured bass extension of 70Hz (-3dB), with a measured sensitivity of 86dB.
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) |
| Spinorama Preference Score | 4.75 |
| Spinorama Preference Score with Perfect Sub | 6.88 |
| Weight | 13 lbs (5.9 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: The Truth about Klipsch’s “NEW” Sound. RP-600M Update. More from Erin’s Audio Corner →
- Erin’s Audio Corner Website Klipsch RP-600M II
- GR-Research: We Bought The "NEW" RP-600M II Is KLIPSCH Listening?! More from GR-Research →
- Erin’s Audio Corner: 5 AWESOME SPEAKERS Under $1000 You Won’t Regret
- Erin’s Audio Corner Measurements (spinorama.org)
- Head-to-Head Comparisons
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- Klipsch RP-600M II vs JBL Studio 630
- Klipsch RP-600M II vs PS Audio Aspen FR5
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- See all 116 comparisons
Tannoy Revolution XT 6: $1100 per pair eBay
Pros: Horizontal directivity is very good outside of a narrow glitch around 2.5kHz, meaning the coaxial design’s off-axis sound closely tracks on-axis within a +/-50 degree toe-in window. Vertical response is notably better than a typical non-coaxial 2-way thanks to the concentric driver, and the downward-firing, base-integrated port is a distinctive, functional piece of industrial design. Measured bass extension of 85Hz (-3dB), with a measured sensitivity of 86.5dB.
Cons: CEA2034 spinorama shows significant on-axis dips and rising amplitude above 3kHz, and distortion measurements are the headline problem - 4-5% distortion at 96dB SPL in the most sensitive part of the audible band, far higher than the Revel M106 comparison unit at the same level. Careful multi-notch EQ improved things but never fully resolved it. The reviewer’s conclusion: “I can’t recommend the Tannoy XT 6” - the coaxial design’s distortion should have been addressed by the designer, not patched after the fact with EQ.
Full Tannoy Revolution XT 6 review and specifications →
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) |
| Dimensions | 15.8H x 8.7W x 11.9D in |
| Drivers | 6" dual-concentric multifiber-cone woofer with coaxial 1" PEI dome tweeter |
| Impedance | 8 ohms nominal |
| Power Handling | 25-120W recommended, 240W peak |
| Sensitivity | 86.5dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 1.52 |
| Spinorama Preference Score with Perfect Sub | 4.04 |
| Weight | 16.5 lbs (7.5 kg) each |
| Woofer Cabinet | ported, bottom-firing |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons