Short answer: the AsciLab C8C. It ranks #1 of 119 powered bookshelf speakers by sound quality (rated 4.9/5); the Neumann KH 150 ranks #8 (rated 4.8/5).
The AsciLab C8C is the more accurate, deeper-bass pick. ASR’s revised measurement combines an 8.48 ideal-subwoofer preference score with a 1.7dB response span from 300Hz to 5kHz, supporting highly even vocal and instrumental balance. Its measured preference score, a predictor of how neutral it sounds, is 7.70 against 6.65 for the Neumann KH 150. Its bass reaches about 30.8Hz before falling 3dB, against 39.6Hz for the Neumann KH 150. The tradeoff: The result applies to the revised measured configuration; confirm that the speaker’s tuning matches it.
What the Neumann KH 150 does well: An exceptionally tight 1.0dB response span from 300Hz to 5kHz supports neutral vocals and instruments. The tradeoff: A two-way nearfield monitor cannot match the largest three-way systems for deep-bass output at distance.
Buy the AsciLab C8C. It is rated higher for sound quality than the Neumann KH 150.
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ASR’s revised measurement combines an 8.48 ideal-subwoofer preference score with a 1.7dB response span from 300Hz to 5kHz, supporting highly even vocal and instrumental balance.
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An exceptionally tight 1.0dB response span from 300Hz to 5kHz supports neutral vocals and instruments.
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Specifications Side By Side
| AsciLab C8C | Neumann KH 150 | |
|---|---|---|
| Price | €5799 per pair | $3,398 per pair |
| Ranked | #1 of 119 in Large Size Powered Bookshelf Speakers | #8 of 119 in Large Size Powered Bookshelf Speakers |
| Enclosure | sealed | ported |
| Drivers | 1” alumina ceramic dome tweeter with waveguide, 2x 6” alumina ceramic midrange/woofers, 2x 8” side mounted opposed cardioid subwoofers | 1” tweeter, 6.5” woofer |
| Dimensions | 22”H x 10”W x 13.8”D (560 x 254 x 350 mm) | 13.6”H x 8.9”W x 10.7”D (345 x 225 x 273 mm) |
| Weight | 60.6 lbs (27.5 kg) each | 17.6 lbs (8.0 kg) each |
| Amplifier Power | 600W total (100W tweeter, 250W midrange, 250W subwoofer) | 245W total (145W woofer, 100W tweeter, 10% THD+N) |
| Bass Extension (-6dB) | 23.4Hz (measured, Audio Science Review) | - |
| Bass Extension (-3dB) | 30.8Hz (measured, Audio Science Review) | 39.6Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 20.5Hz (measured, Audio Science Review) | 34.2Hz (measured, Audio Science Review) |
| Crossover Frequency | 150Hz, 1.2kHz | 1.7kHz |
| Warranty | 2 years | 2 years |
| Country | South Korea | Germany |
| Spinorama Preference Score | 7.70 | 6.65 |
| Spinorama Preference Score with Perfect Sub | 8.48 | 8.38 |
| Inputs | XLR, RCA, AES/EBU, Coaxial, Optical | XLR (balanced analog), RCA S/PDIF (digital) |
| XLR Input | Yes | Yes |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| Optical Input | Yes | No |
| Coaxial Input | Yes | Yes |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | Yes | No |
| Aux Input | No | No |
| Bluetooth | No | No |
| Frequency Response | 30Hz - 20kHz (±1.5dB) (Manufacturer specified) | 39Hz-20.4kHz +/-3dB |
| Maximum SPL | - | 118.7dB @ 1m half space (manufacturer specified) |
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: AsciLab C8C (measured by Audio Science Review) and Neumann KH 150 (measured by Audio Science Review), via spinorama.org.
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