Short answer: the JBL 308P MKII. It ranks #22 of 67 powered bookshelf speakers by sound quality at $249; the Cambridge Audio L/R X ranks #47 and costs $2399, so there is not much of a tradeoff to weigh.
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 JBL 308P MKII offers: A 1.8dB response span from 300Hz to 5kHz and 6.89 ideal-subwoofer score support unusually good tonal balance for an accessible studio monitor. Measured -3dB extension of 42.5Hz supplies useful musical bass, and the waveguide helps maintain consistent horizontal coverage. Watch for: Amplifier hiss may be noticeable in quiet, close-range use. Bass distortion and output limits matter when playing loudly, despite the 8-inch woofer. Keep the tweeter near ear height; vertical crossover behavior is less forgiving than the best coaxial designs.
Buy the JBL 308P MKII. It ranks higher for sound quality than the Cambridge Audio L/R X and costs less, so the other one has nothing left to offer.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| Cambridge Audio L/R X | JBL 308P MKII | |
|---|---|---|
| Price | $2,399.00 per pair | $498 per pair |
| Ranked | #47 of 67 in Large Size Powered Bookshelf Speakers | #22 of 67 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 43Hz (measured, Erin's Audio Corner) | 82Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 37Hz (measured, Erin's Audio Corner) | 60Hz (measured, Audio Science Review) |
| Drivers | 28mm aluminum tweeter, 2x 5" mid-woofers, 2x 6" side-firing passive radiators | 8" woofer, 1" neodymium tweeter |
| Frequency Response | 35Hz - 24kHz (±3dB, manufacturer specified) | 45Hz - 20kHz (+/-3dB) (Manufacturer specified) |
| Amplifier Power | 800W total (400W per speaker) | 112W total |
| Inputs | HDMI eARC, RCA aux, RCA phono (MM), optical digital, USB-C, USB-A, Ethernet, Wi-Fi | - |
| Bluetooth Codecs | SBC, AAC | - |
| App | Yes | No |
| DSP | Yes, room size, wall distance, and reflective surface correction | No |
| Dimensions | 7.9" (200 mm) W x 330mm H x 260mm D (each) | 16.5"H x 10"W x 12.1"D (419.1 x 254 x 307.3 mm) |
| Weight | 22.9 lbs (10.4kg) each | not published by manufacturer |
| Subwoofer Output | Yes | - |
| Outputs | Subwoofer | - |
| EQ | - | No |
| Spinorama Preference Score | - | 5.08 |
| Spinorama Preference Score with Perfect Sub | - | 6.89 |
Related Speaker Comparisons
How JBL 308P MKII compares with other leading options:
- AsciLab C8C vs JBL 308P MKII
- Mesanovic CDM65 vs JBL 308P MKII
- JBL 308P MKII vs Genelec 8351B
- JBL 308P MKII vs Neumann KH420
- Genelec 8361A vs JBL 308P MKII
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 |
- Links
- Reviews, Comparisons and Sound Samples
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JBL 308P MKII: $498 per pair B&H Photo Video eBay
Pros: A 1.8dB response span from 300Hz to 5kHz and 6.89 ideal-subwoofer score support unusually good tonal balance for an accessible studio monitor. Measured -3dB extension of 42.5Hz supplies useful musical bass, and the waveguide helps maintain consistent horizontal coverage. Measured bass extension of 82Hz (-3dB).
Cons: Amplifier hiss may be noticeable in quiet, close-range use. Bass distortion and output limits matter when playing loudly, despite the 8-inch woofer. Keep the tweeter near ear height; vertical crossover behavior is less forgiving than the best coaxial designs.
Full JBL 308P MKII review and specifications →
| Amplifier Power | 112W total |
|---|---|
| App | No |
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 82Hz (measured, Audio Science Review) |
| DSP | No |
| Dimensions | 16.5"H x 10"W x 12.1"D (419.1 x 254 x 307.3 mm) |
| Drivers | 8" woofer, 1" neodymium tweeter |
| EQ | No |
| Frequency Response | 45Hz - 20kHz (+/-3dB) (Manufacturer specified) |
| Spinorama Preference Score | 5.08 |
| Spinorama Preference Score with Perfect Sub | 6.89 |
| Weight | not published by manufacturer |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons