Short answer: the Neumann KH 150. Both are rated 4.8/5 for sound quality (#8 and #5 of 68 powered bookshelf speakers), and the Neumann KH 150 costs $3,398 against $10,500 for the Neumann KH420, so with nothing between them on sound quality, price settles it.
What the Neumann KH420 offers: CEA2034 spinorama shows an extended, flat on-axis response that matches Neumann’s own published measurement to within 0.08dB at its one minor dip (around 60Hz), with excellent off-axis behavior. The tradeoff: Horizontal beamwidth, while well controlled, is on the narrow side at about ±55 degrees.
On the Neumann KH 150 side: Neumann’s Mathematically Modelled Dispersion waveguide produces a listening window smoothness score of 0.69 with a steadily narrowing directivity index through the treble, and the 6.5 inch woofer reaches a genuine 39.6Hz extension point. Watch for: The sound power directivity index has the widest standard deviation of any speaker in this batch, 3.89, meaning off axis energy tracks the on axis response a little less consistently than the tightest speakers here as frequency rises.
Buy the Neumann KH 150. Both are rated the same for sound quality, and it costs $7,102 less than the Neumann KH420.
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Specifications Side By Side
| Neumann KH420 | Neumann KH 150 | |
|---|---|---|
| Price | $10500 per pair | $3,398 per pair |
| Ranked | #5 of 68 in Large Size Powered Bookshelf Speakers | #8 of 68 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-10dB) | 24.4Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) | 34.2Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 27.8Hz (measured, Audio Science Review) | 39.6Hz (measured, Audio Science Review) |
| Dimensions | 25.4”H x 13”W x 17.5”D (645.2 x 330.2 x 444.5 mm) | 13.6”H x 8.9”W x 10.7”D (345 x 225 x 273 mm) |
| Inputs | XLR | XLR (balanced analog), RCA S/PDIF (digital) |
| Weight | 77.2 lbs (35 kg) each | 17.6 lbs (8.0 kg) each |
| Drivers | 10” woofer, 4” dome midrange, 1” fabric dome tweeter | 1” tweeter, 6.5” woofer |
| App | Yes (MA 1 alignment) | - |
| Bluetooth | No | No |
| DSP | No | - |
| EQ | Yes (Room response controls) | - |
| Frequency Response | 31Hz - 21kHz (±3dB) (Manufacturer specified) | 39Hz-20.4kHz +/-3dB |
| Amplifier Power | 555w Per Speaker | 245W total (145W woofer, 100W tweeter, 10% THD+N) |
| Maximum SPL | 124dB @ 1m (manufacturer specified) | 118.7dB @ 1m half space (manufacturer specified) |
| Spinorama Preference Score | 7.02 | 6.65 |
| Spinorama Preference Score with Perfect Sub | 8.14 | 8.38 |
| XLR Input | Yes | Yes |
| RCA Input | No | Yes |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | Yes |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | No |
| Enclosure | - | ported |
| Crossover Frequency | - | 1.7kHz |
| Warranty | - | 2 years |
| Country | - | Germany |
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Prices on this page were last checked October 3, 2026 at 10:26 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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The Two Speakers In Full
Neumann KH420: $10500 per pair B&H Photo Video eBay
Pros: A 1.2dB response span from 300Hz to 5kHz, 8.14 ideal-subwoofer score and 27.8Hz measured -3dB extension combine accurate mids with genuinely deep bass. Its three-way design and low distortion at normal levels make it particularly attractive for larger listening distances and dynamic material. Measured bass extension of 27.8Hz (-3dB).
Cons: It is a large, heavy studio monitor rather than an easy desktop speaker. Vertical alignment matters around the crossover regions. Bass distortion rises as playback levels increase, and the measured high-level limits still apply despite the substantial drivers and amplifiers. Horizontal beamwidth is well controlled but on the narrow side at about ±55°.
Full Neumann KH420 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 555w Per Speaker |
| App | Yes (MA 1 alignment) |
| Aux Input | No |
| Bass Extension (-10dB) | 24.4Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 27.8Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| DSP | No |
| Dimensions | 25.4”H x 13”W x 17.5”D (645.2 x 330.2 x 444.5 mm) |
| Drivers | 10” woofer, 4” dome midrange, 1” fabric dome tweeter |
| EQ | Yes (Room response controls) |
| Frequency Response | 31Hz - 21kHz (±3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | XLR |
| Maximum SPL | 124dB @ 1m (manufacturer specified) |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 7.02 |
| Spinorama Preference Score with Perfect Sub | 8.14 |
| TRS Input | No |
| USB Input | No |
| Weight | 77.2 lbs (35 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Neumann KH 150: $3,398 per pair B&H Photo Video eBay
Pros: An exceptionally tight 1.0dB response span from 300Hz to 5kHz supports neutral vocals and instruments. The measured ideal-subwoofer score is 8.38, with -3dB bass extension to 39.6Hz. DSP and optional MA 1 alignment offer useful control over room-related response errors. Measured bass extension of 39.6Hz (-3dB).
Cons: A two-way nearfield monitor cannot match the largest three-way systems for deep-bass output at distance. Keep the tweeter near ear height to avoid crossover-related changes off the vertical axis. MA 1 calibration requires additional equipment, and studio connections are less convenient than a consumer streaming system.
Full Neumann KH 150 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 245W total (145W woofer, 100W tweeter, 10% THD+N) |
| Aux Input | No |
| Bass Extension (-10dB) | 34.2Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 39.6Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | Yes |
| Country | Germany |
| Crossover Frequency | 1.7kHz |
| Dimensions | 13.6”H x 8.9”W x 10.7”D (345 x 225 x 273 mm) |
| Drivers | 1” tweeter, 6.5” woofer |
| Enclosure | ported |
| Frequency Response | 39Hz-20.4kHz +/-3dB |
| HDMI Input | No |
| Inputs | XLR (balanced analog), RCA S/PDIF (digital) |
| Maximum SPL | 118.7dB @ 1m half space (manufacturer specified) |
| Optical Input | No |
| RCA Input | Yes |
| Spinorama Preference Score | 6.65 |
| Spinorama Preference Score with Perfect Sub | 8.38 |
| TRS Input | No |
| USB Input | No |
| Warranty | 2 years |
| Weight | 17.6 lbs (8.0 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons