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 223 bookshelf speakers, rated 4.7/5, at $4,150. The Klipsch RP-600M II ranks #124, rated 3.7/5, at $449.99, $3,700.01 cheaper.
The case for the Klipsch RP-600M II: Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals. The catch: 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 March Audio Sointuva AWG is the more accurate, deeper-bass option. A Purifi powered bookshelf speaker with extremely flat sound, very low distortion, and unusually deep bass for its size. Its measured preference score, a predictor of how neutral it sounds, is 6.95 against 5.64 for the Klipsch RP-600M II. Its bass reaches about 40Hz before falling 3dB, against 70Hz for the Klipsch RP-600M II. The tradeoff: 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.
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.
Bookshelf speakers with a large horn tweeter, wide soundstage, high efficiency and bi-amp ready terminals.
A Purifi powered bookshelf speaker with extremely flat sound, very low distortion, and unusually deep bass for its size.
Prices on this page were last checked October 29, 2026 at 4:42 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 | March Audio Sointuva AWG | |
|---|---|---|
| Price | $449.99 per pair | $4150 per pair |
| Ranked | #124 of 223 in Large Size Bookshelf Speakers | #5 of 223 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 | 5.64 | 6.95 |
| Spinorama Preference Score with Perfect Sub | 7.77 | 8.45 |
| DIY Kit | No | 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.
Measurement data: Klipsch RP-600M II (measured by Erin’s Audio Corner) and March Audio Sointuva AWG (measured by Erin’s Audio Corner), via spinorama.org.
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