Short answer: the Neumann KH 150 for measured smoothness, the JBL M2 for its flagship build. The KH 150’s waveguide produces a listening window smoothness score of 0.69 with steadily narrowing directivity through the treble, and its 6.5-inch woofer reaches a genuine 39.6Hz, though its sound power directivity index has the widest standard deviation here at 3.89. The M2’s 15-inch woofer and D2 compression driver make it a flagship monitor with an expensive, complex DSP requirement.
What the JBL M2 Master Reference Monitor offers: Flagship quasi-active two-way with a 15-inch 2216Nd woofer and D2 compression driver crossing near 800Hz through a large Image Control Waveguide. Set against that: The required bi-amplification/DSP ecosystem is expensive and complex; Erin’s Crown I-Tech 5000HD had fans loud enough that he moved it to another room for measurements.
Buy the Neumann KH 150. It is rated higher for sound quality than the JBL M2 Master Reference Monitor and costs less, which makes it the one to get unless you need something the other one does better.
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Specifications Side By Side
| JBL M2 Master Reference Monitor | Neumann KH 150 | |
|---|---|---|
| Price | $15,000 per pair | $3,398 per pair |
| Ranked | #35 of 68 in Large Size Powered Bookshelf Speakers | #8 of 68 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 34Hz (measured, Erin’s Audio Corner) | 39.6Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 21.0Hz (measured, Erin’s Audio Corner) | 34.2Hz (measured, Audio Science Review) |
| Drivers | 15” 2216Nd woofer; D2 compression driver in Image Control Waveguide | 1” tweeter, 6.5” woofer |
| Crossover Frequency | 800Hz active DSP | 1.7kHz |
| Weight | 130.1 lbs (59 kg) each | 17.6 lbs (8.0 kg) each |
| Maximum SPL | 123dB manufacturer specified | 118.7dB @ 1m half space (manufacturer specified) |
| Spinorama Preference Score | 5.74 | 6.65 |
| Spinorama Preference Score with Perfect Sub | 6.58 | 8.38 |
| Amplifier Power | External two-channel amplification and JBL DSP tuning required | 245W total (145W woofer, 100W tweeter, 10% THD+N) |
| Inputs | None (passive cabinet driven by a matched Crown amplifier via speaker-level connection) | XLR (balanced analog), RCA S/PDIF (digital) |
| XLR Input | No | 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 |
| Dimensions | 49.4”H x 20”W x 14”D (1256 x 508 x 355.6 mm) | 13.6”H x 8.9”W x 10.7”D (345 x 225 x 273 mm) |
| Bluetooth | No | No |
| Frequency Response | 20Hz - 40kHz (±3dB) (Manufacturer specified) | 39Hz-20.4kHz +/-3dB |
| Enclosure | - | ported |
| 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
JBL M2 Master Reference Monitor: $15,000 per pair JBL Professional Dealer Locator eBay
Pros: A high-output specialist: Erin’s low-distortion and compression tests support considerable dynamic capability, beyond what a single preference score captures. Measured -3dB extension is 33.7Hz. The large woofer and waveguide are particularly useful for greater listening distances. Measured bass extension of 34Hz (-3dB).
Cons: Its 4.1dB response span from 300Hz to 5kHz and 6.58 ideal-subwoofer score do not support a top tonal-accuracy ranking. It requires the correct external amplification and DSP rather than a simple built-in amplifier. The very large cabinet, installation cost and possible amplifier fan noise make it impractical for most desks.
Full JBL M2 Master Reference Monitor review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | External two-channel amplification and JBL DSP tuning required |
| Aux Input | No |
| Bass Extension (-10dB) | 21.0Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 34Hz (measured, Erin’s Audio Corner) |
| Bluetooth | No |
| Coaxial Input | No |
| Crossover Frequency | 800Hz active DSP |
| Dimensions | 49.4”H x 20”W x 14”D (1256 x 508 x 355.6 mm) |
| Drivers | 15” 2216Nd woofer; D2 compression driver in Image Control Waveguide |
| Frequency Response | 20Hz - 40kHz (±3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | None (passive cabinet driven by a matched Crown amplifier via speaker-level connection) |
| Maximum SPL | 123dB manufacturer specified |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.74 |
| Spinorama Preference Score with Perfect Sub | 6.58 |
| TRS Input | No |
| USB Input | No |
| Weight | 130.1 lbs (59 kg) each |
| XLR Input | No |
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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