Short answer: the March Audio Sointuva AWG for better sound quality, the Klipsch RP-600M II for the lower price. The March Audio Sointuva AWG ranks #5 of 130 bookshelf speakers at $4150. The Klipsch RP-600M II ranks #74 at $449.99, $3700.01 cheaper.
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 March Audio Sointuva AWG offers: Purifi drivers deliver exceptionally low midrange distortion - the reviewer calls them “world class” - paired with bass extension unusually deep for a bookshelf (F3 40Hz, F10 30Hz), reaching down to about 30Hz in-room with some boundary reinforcement. Sensitivity tolerance band measured extremely tight at 1.6-1.73dB, indicating excellent build consistency. Estimated in-room response is exceptionally smooth and neutral - one of the flattest the reviewer has measured, with none of the usual coloration descriptors (bright, boomy, nasal, shouty) needed to describe it. Distortion stays so low even at loud volumes that there’s no audible warning cue before you’re playing dangerously loud - a backhanded compliment to how clean it sounds. At $4,150/pair, ranked among the reviewer’s top three bookshelf speakers in that price range. Watch for: Correct listening axis sits about 7° above the tweeter line, which means shorter stands (around 24”) than typical bookshelf stands are sold at - get the height wrong and the sound scoops out in the mid/high frequencies. Moderate-low sensitivity (~82dB) is roughly 3dB below a typical bookshelf speaker, meaning close to double the amplifier power is needed for the same output; low impedance also calls for a 4-ohm capable amp. Horizontal radiation holds a wide ±60° only up to about 3kHz before narrowing - tighter top-end dispersion than the reviewer’s preferred ±60-70° through the treble, and the reason he left the previous generation off his all-time top-five list. Multitone distortion rises above the reviewer’s personal 3% threshold in the 1-2kHz region, though it wasn’t audible in his listening. Not intended to be crossed over with a subwoofer at 80Hz - designed to play full-range down to 40-50Hz, so pairing it with a sub and cutting it off early wastes its bass capability. Best positioned about 3 feet from the rear wall, requiring more floor space than many bookshelf speakers.
Buy the Klipsch RP-600M II if the price is the priority over sound quality, or the March Audio Sointuva AWG if sound quality is the priority over the price.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Klipsch RP-600M II | March Audio Sointuva AWG | |
|---|---|---|
| Price | $449.99 per pair | $4150 per pair |
| Ranked | #74 of 130 in Large Size Bookshelf Speakers | #5 of 130 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 41Hz (measured, Erin's Audio Corner) | 30Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 70Hz (measured, Erin's Audio Corner) | 40Hz (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) | 17.7"H x 9.4"W x 8.7"D (449.6 x 238.8 x 221 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) | 82.4dB (measured, Erin's Audio Corner) |
| Drivers | 6.5" Cerametallic cone woofer, 1" titanium LTS vented tweeter with Tractrix horn | 6.5" Purifi PTT-OEM Midwoofer, Satori TW29BNWG-4 Beryllium Dome Tweeter with Waveguide |
| Weight | 13 lbs (5.9 kg) each | 11 lbs (5 kg) |
| Woofer Cabinet | ported | passive radiator |
| Spinorama Preference Score | 4.75 | 6.50 |
| Spinorama Preference Score with Perfect Sub | 6.88 | 7.99 |
Related Speaker Comparisons
More worthwhile head-to-heads for March Audio Sointuva AWG:
- KEF Reference 1 Meta vs March Audio Sointuva AWG
- GR-Research NX-Studio vs March Audio Sointuva AWG
- AsciLab C6B vs March Audio Sointuva AWG
- KEF R3 Meta vs March Audio Sointuva AWG
- KEF Q Concerto Meta vs March Audio Sointuva AWG
Prices on this page were last checked September 14, 2026 at 1:47 AM 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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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
- Klipsch RP-600M II vs Dynaudio Emit 20
- Klipsch RP-600M II vs Philharmonic BMR Monitor
- Klipsch RP-600M II vs JBL Studio 630
- Klipsch RP-600M II vs Behringer B2030P
- Klipsch RP-600M II vs Ascend CBM-170 SE2
- Klipsch RP-600M II vs Infinity Reference R162
- Klipsch RP-600M II vs GR-Research X-LS Encore
- Klipsch RP-600M II vs Infinity IL10
- See all 72 comparisons
March Audio Sointuva AWG: $4150 per pair Marchaudio eBay
Pros: Purifi drivers deliver exceptionally low midrange distortion - the reviewer calls them “world class” - paired with bass extension unusually deep for a bookshelf (F3 40Hz, F10 30Hz), reaching down to about 30Hz in-room with some boundary reinforcement. Sensitivity tolerance band measured extremely tight at 1.6-1.73dB, indicating excellent build consistency. Estimated in-room response is exceptionally smooth and neutral - one of the flattest the reviewer has measured, with none of the usual coloration descriptors (bright, boomy, nasal, shouty) needed to describe it. Distortion stays so low even at loud volumes that there’s no audible warning cue before you’re playing dangerously loud - a backhanded compliment to how clean it sounds. At $4,150/pair, ranked among the reviewer’s top three bookshelf speakers in that price range. Measured bass extension of 40Hz (-3dB), with a measured sensitivity of 82.4dB.
Cons: Correct listening axis sits about 7° above the tweeter line, which means shorter stands (around 24”) than typical bookshelf stands are sold at - get the height wrong and the sound scoops out in the mid/high frequencies. Moderate-low sensitivity (~82dB) is roughly 3dB below a typical bookshelf speaker, meaning close to double the amplifier power is needed for the same output; low impedance also calls for a 4-ohm capable amp. Horizontal radiation holds a wide ±60° only up to about 3kHz before narrowing - tighter top-end dispersion than the reviewer’s preferred ±60-70° through the treble, and the reason he left the previous generation off his all-time top-five list. Multitone distortion rises above the reviewer’s personal 3% threshold in the 1-2kHz region, though it wasn’t audible in his listening. Not intended to be crossed over with a subwoofer at 80Hz - designed to play full-range down to 40-50Hz, so pairing it with a sub and cutting it off early wastes its bass capability. Best positioned about 3 feet from the rear wall, requiring more floor space than many bookshelf speakers.
Full March Audio Sointuva AWG review and specifications →
| Bass Extension (-10dB) | 30Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 40Hz (measured, Erin's Audio Corner) |
| Dimensions | 17.7"H x 9.4"W x 8.7"D (449.6 x 238.8 x 221 mm) |
| Drivers | 6.5" Purifi PTT-OEM Midwoofer, Satori TW29BNWG-4 Beryllium Dome Tweeter with Waveguide |
| Impedance | 6 ohms |
| Sensitivity | 82.4dB (measured, Erin's Audio Corner) |
| Spinorama Preference Score | 6.50 |
| Spinorama Preference Score with Perfect Sub | 7.99 |
| Weight | 11 lbs (5 kg) |
| Woofer Cabinet | passive radiator |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- March Audio Sointuva AWG vs GR-Research NX-Studio
- March Audio Sointuva AWG vs AsciLab C6B
- March Audio Sointuva AWG vs KEF Reference 1 Meta
- March Audio Sointuva AWG vs KEF R3 Meta
- March Audio Sointuva AWG vs KEF Q Concerto Meta
- March Audio Sointuva AWG vs Wharfedale Aura 2
- March Audio Sointuva AWG vs MoFi SourcePoint 8
- March Audio Sointuva AWG vs GR-Research NX-Bravo
- See all 10 comparisons