Short answer: the Neumann KH 150 on measured sound quality, the Cambridge Audio L/R X on price. The Neumann KH 150 ranks #8 of 67 powered bookshelf speakers at $3398. The Cambridge Audio L/R X ranks #47 at $2399, $999 cheaper.
What the Cambridge Audio L/R X offers: A 2.5-way active design with a 28mm aluminum tweeter, a front-facing 5-inch mid-woofer, a second 5-inch woofer at the base whose passband overlaps the first (the source of the “.5”), and dual 6-inch side-firing passive radiators per speaker. Erin’s Audio Corner measured wide, even horizontal dispersion (a broad flare out to about the -6dB point around 1.5 to 3kHz) and deeper extension than the smaller L/R S, with an F3 of about 43Hz and F10 of about 37Hz. In-app DSP for room size, speaker distance from the front wall, and reflective surface type gave an audible change in bass tightness in testing. Connectivity covers HDMI eARC, RCA aux, a moving-magnet phono input, optical digital, USB-C, USB-A, Wi-Fi streaming, and a subwoofer output, making it a full living-room hub rather than just a stereo pair. Watch for: On-axis response is less linear than the L/R S, with dips in the bass, a peak around 1-2kHz, and a dip spanning the upper mid-range into the lower treble; Cambridge confirmed the dip is a deliberate DSP notch for a tweeter breakup resonance rather than a driver flaw, but it was audible as a mild suck-out in an AB pink-noise comparison. Vertical dispersion is narrower and asymmetric than the L/R S, at about plus 20 to minus 10 degrees, because the greater distance between the tweeter and mid-woofer creates more lobing, so listening height and stand placement matter more. Multitone distortion rides close to the 3% threshold at 96dB measured at 1 meter in the far field, limiting headroom for loud, wide-band material. Output falls off quickly below about 50Hz, so home-theater use with deep bass content benefits from an added subwoofer.
What the Neumann KH 150 offers: An exceptionally tight 1.0dB response span from 300Hz to 5kHz supports neutral vocals and instruments. The measured ideal-subwoofer score is 7.58, with -3dB bass extension to 39.6Hz. DSP and optional MA 1 alignment offer useful control over room-related response errors. Watch for: 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.
Buy the Cambridge Audio L/R X when the price outweighs sound quality for you, and the Neumann KH 150 when sound quality outweighs the price instead.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| Cambridge Audio L/R X | Neumann KH 150 | |
|---|---|---|
| Price | $2,399.00 per pair | $3,398 per pair |
| Ranked | #47 of 67 in Large Size Powered Bookshelf Speakers | #8 of 67 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 43Hz (measured, Erin's Audio Corner) | 39.6Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 37Hz (measured, Erin's Audio Corner) | 34.2Hz (measured, Audio Science Review) |
| Drivers | 28mm aluminum tweeter, 2x 5" mid-woofers, 2x 6" side-firing passive radiators | 1" tweeter, 6.5" woofer |
| Frequency Response | 35Hz - 24kHz (±3dB, manufacturer specified) | 39Hz-20.4kHz +/-3dB |
| Amplifier Power | 800W total (400W per speaker) | 245W total (145W woofer, 100W tweeter, 10% THD+N) |
| Inputs | HDMI eARC, RCA aux, RCA phono (MM), optical digital, USB-C, USB-A, Ethernet, Wi-Fi | - |
| Bluetooth Codecs | SBC, AAC | - |
| App | Yes | - |
| DSP | Yes, room size, wall distance, and reflective surface correction | - |
| Dimensions | 7.9" (200 mm) W x 330mm H x 260mm D (each) | 13.6"H x 8.9"W x 10.7"D (345 x 225 x 273 mm) |
| Weight | 22.9 lbs (10.4kg) each | 17.6 lbs (8.0 kg) each |
| Subwoofer Output | Yes | - |
| Outputs | Subwoofer | - |
| Enclosure | - | ported |
| Crossover Frequency | - | 1.7kHz |
| Warranty | - | 2 years |
| Country | - | Germany |
| Maximum SPL | - | 118.7dB @ 1m half space (manufacturer specified) |
| Spinorama Preference Score | - | 5.84 |
| Spinorama Preference Score with Perfect Sub | - | 7.58 |
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Prices on this page were last checked September 16, 2026 at 12:41 AM 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
Cambridge Audio L/R X: $2,399.00 per pair Amazon eBay
Pros: A 2.5-way active design with a 28mm aluminum tweeter, a front-facing 5-inch mid-woofer, a second 5-inch woofer at the base whose passband overlaps the first (the source of the “.5”), and dual 6-inch side-firing passive radiators per speaker. Erin’s Audio Corner measured wide, even horizontal dispersion (a broad flare out to about the -6dB point around 1.5 to 3kHz) and deeper extension than the smaller L/R S, with an F3 of about 43Hz and F10 of about 37Hz. In-app DSP for room size, speaker distance from the front wall, and reflective surface type gave an audible change in bass tightness in testing. Connectivity covers HDMI eARC, RCA aux, a moving-magnet phono input, optical digital, USB-C, USB-A, Wi-Fi streaming, and a subwoofer output, making it a full living-room hub rather than just a stereo pair. Measured bass extension of 43Hz (-3dB).
Cons: On-axis response is less linear than the L/R S, with dips in the bass, a peak around 1-2kHz, and a dip spanning the upper mid-range into the lower treble; Cambridge confirmed the dip is a deliberate DSP notch for a tweeter breakup resonance rather than a driver flaw, but it was audible as a mild suck-out in an AB pink-noise comparison. Vertical dispersion is narrower and asymmetric than the L/R S, at about plus 20 to minus 10 degrees, because the greater distance between the tweeter and mid-woofer creates more lobing, so listening height and stand placement matter more. Multitone distortion rides close to the 3% threshold at 96dB measured at 1 meter in the far field, limiting headroom for loud, wide-band material. Output falls off quickly below about 50Hz, so home-theater use with deep bass content benefits from an added subwoofer.
Full Cambridge Audio L/R X review and specifications →
| Amplifier Power | 800W total (400W per speaker) |
|---|---|
| App | Yes |
| Bass Extension (-10dB) | 37Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 43Hz (measured, Erin's Audio Corner) |
| Bluetooth Codecs | SBC, AAC |
| DSP | Yes, room size, wall distance, and reflective surface correction |
| Dimensions | 7.9" (200 mm) W x 330mm H x 260mm D (each) |
| Drivers | 28mm aluminum tweeter, 2x 5" mid-woofers, 2x 6" side-firing passive radiators |
| Frequency Response | 35Hz - 24kHz (±3dB, manufacturer specified) |
| Inputs | HDMI eARC, RCA aux, RCA phono (MM), optical digital, USB-C, USB-A, Ethernet, Wi-Fi |
| Outputs | Subwoofer |
| Subwoofer Output | Yes |
| Weight | 22.9 lbs (10.4kg) each |
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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 7.58, 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 →
| Amplifier Power | 245W total (145W woofer, 100W tweeter, 10% THD+N) |
|---|---|
| Bass Extension (-10dB) | 34.2Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 39.6Hz (measured, Audio Science Review) |
| 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 |
| Maximum SPL | 118.7dB @ 1m half space (manufacturer specified) |
| Spinorama Preference Score | 5.84 |
| Spinorama Preference Score with Perfect Sub | 7.58 |
| Warranty | 2 years |
| Weight | 17.6 lbs (8.0 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons