Neumann KH 150 vs Focal Solo6 ST6

Short answer: the Neumann KH 150 for measured response, the Focal Solo6 ST6 for driver technology. The KH 150 offers a 0.69 listening window smoothness score and genuine 39.6Hz extension from its 6.5 inch woofer. The Solo6 ST6’s beryllium inverted-dome tweeter over a 6.5” W composite sandwich-cone woofer is a low-mass, low-distortion pairing rarely found below pricier monitors, but its higher bass alignment Q can add fullness.

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. Set against that: 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. It is rated higher for sound quality, and the $400 you would save on the Focal Solo6 ST6 does not close the gap.

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Specifications Side By Side

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The Two Speakers In Full

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
  • Neumann KH 150 Official Page
• Reviews, Comparisons and Sound Samples
  • Audio Science Review Measurements More from Audio Science Review →
  • Audio Science Review Measurements (spinorama.org)
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Focal Solo6 ST6: $2,998 per pair B&H Photo Video eBay

Pros: ASR measured a tight 1.6dB response span from 300Hz to 5kHz and a 7.34 ideal-subwoofer score, supporting accurate midrange monitoring. The beryllium tweeter and Focus mode offer a useful professional workflow, with Focus serving as an alternate mix-check presentation. Its beryllium inverted-dome tweeter and 6.5-inch W composite sandwich-cone woofer are a low-mass, low-distortion pairing. Measured bass extension of 46.9Hz (-3dB).

Cons: The measured -3dB point is 46.9Hz, so deep-bass work benefits from a subwoofer. The standard-mode score does not apply to Focus mode. There is no automatic room-calibration system, and premium driver materials alone do not establish superior sound.

Full Focal Solo6 ST6 review and specifications →

AES Input	No
Amplifier Power	130W total (80W LF + 50W HF); Bi-amped (Class G LF + Class AB HF)
Aux Input	No
Bass Extension (-10dB)	38.1Hz (measured, spinorama.org)
Bass Extension (-3dB)	46.9Hz (measured, spinorama.org)
Bluetooth	No
Coaxial Input	No
Dimensions	24.6 x 33.4 x 29.5cm (9.7 x 13.1 x 11.6 in) each, 13kg (28.6 lb) each
Drivers	1” Beryllium inverted-dome tweeter, 6.5” “W” composite sandwich-cone woofer
Frequency Response	40Hz - 40kHz (±3dB) (Manufacturer specified)
HDMI Input	No
Inputs	XLR
Maximum SPL	110dB peak at 1m
Optical Input	No
RCA Input	No
Spinorama Preference Score	5.32
Spinorama Preference Score with Perfect Sub	7.34
TRS Input	No
USB Input	No
Weight	28.7 lbs (13 kg)
XLR Input	Yes

• Links
  • Official Focal Solo6 ST6 Product Page
• Reviews, Comparisons and Sound Samples
  • Audio Science Review Measurements (spinorama.org) More from Audio Science Review →
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