Short answer: the Cambridge Audio L/R X. Both are rated 4.1/5 for sound quality (#48 and #45 of 68 powered bookshelf speakers), and the Cambridge Audio L/R X costs $2399 against $4500 for the JBL 4329P, with sound quality a draw, the lower price decides it.
The case for the Cambridge Audio L/R X: 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. The catch: 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.
The case for the JBL 4329P: Measured -3dB extension of 32.2Hz provides deeper native bass than the smaller 4305P. Watch for: The measured 4.5dB response span from 300Hz to 5kHz includes a notable midrange dip, so it is not as neutral as its size and price might suggest.
Buy the Cambridge Audio L/R X. Both are rated the same for sound quality, and it costs $2101 less than the JBL 4329P.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| Cambridge Audio L/R X | JBL 4329P | |
|---|---|---|
| Price | $2,399.00 per pair | $4,500 per pair |
| Ranked | #48 of 68 in Large Size Powered Bookshelf Speakers | #45 of 68 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 43Hz (measured, Erin's Audio Corner) | 31Hz (measured, Erin's Audio Corner) |
| Bass Extension (-10dB) | 37Hz (measured, Erin's Audio Corner) | 27Hz (measured, Erin's Audio Corner) |
| Drivers | 28mm aluminum tweeter, 2x 5" mid-woofers, 2x 6" side-firing passive radiators | 8" midwoofer, 1" compression driver with JBL High-Definition Imaging horn |
| Frequency Response | 35Hz - 24kHz (±3dB, manufacturer specified) | 30Hz - 20kHz (anechoic, manufacturer specified) |
| Amplifier Power | 800W total (400W per speaker) | 300W RMS per speaker (600W total system power) |
| Inputs | HDMI eARC, RCA aux, RCA phono (MM), optical digital, USB-C, USB-A, Ethernet, Wi-Fi | USB, Optical, Bluetooth, Analog, 3.5mm, AirPlay 2 |
| Bluetooth Codecs | SBC, AAC | SBC, aptX Adaptive |
| 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) | 20.3"H x 12.6"W x 12.7"D |
| Weight | 22.9 lbs (10.4kg) each | 34.4 lbs (15.6 kg) (primary), 34.4 lbs (15.6 kg) (secondary) |
| Subwoofer Output | Yes | - |
| Outputs | Subwoofer | - |
| XLR Input | No | No |
| RCA Input | Yes | No |
| TRS Input | No | No |
| Optical Input | Yes | Yes |
| Coaxial Input | No | No |
| USB Input | Yes | Yes |
| HDMI Input | Yes | No |
| AES Input | No | No |
| Aux Input | No | Yes |
| Bluetooth | Yes | Yes, 5.3 |
| Sensitivity | - | 102.2dB (measured at 0.3V/1m, Erin's Audio Corner) |
| Woofer Cabinet | - | ported |
| Spinorama Preference Score | - | 5.40 |
| Spinorama Preference Score with Perfect Sub | - | 6.72 |
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Prices on this page were last checked September 23, 2026 at 11:24 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
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 →
| AES Input | No |
|---|---|
| Amplifier Power | 800W total (400W per speaker) |
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 37Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 43Hz (measured, Erin's Audio Corner) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Coaxial Input | No |
| 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) |
| HDMI Input | Yes |
| Inputs | HDMI eARC, RCA aux, RCA phono (MM), optical digital, USB-C, USB-A, Ethernet, Wi-Fi |
| Optical Input | Yes |
| Outputs | Subwoofer |
| RCA Input | Yes |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | Yes |
| Weight | 22.9 lbs (10.4kg) each |
| XLR Input | No |
- Links
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JBL 4329P: $4,500 per pair Amazon eBay
Pros: Measured -3dB extension of 32.2Hz provides deeper native bass than the smaller 4305P. Integrated amplification and streaming make it convenient for a full-range living-room system, and its larger format is useful when scale matters. Measured bass extension of 31Hz (-3dB), with a measured sensitivity of 102.2dB.
Cons: The measured 4.5dB response span from 300Hz to 5kHz includes a notable midrange dip, so it is not as neutral as its size and price might suggest. Its 6.72 ideal-subwoofer score trails the 4305P. There is no HDMI connection for the simplest TV hookup.
Full JBL 4329P review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 300W RMS per speaker (600W total system power) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 27Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 31Hz (measured, Erin's Audio Corner) |
| Bluetooth | Yes, 5.3 |
| Bluetooth Codecs | SBC, aptX Adaptive |
| Coaxial Input | No |
| Dimensions | 20.3"H x 12.6"W x 12.7"D |
| Drivers | 8" midwoofer, 1" compression driver with JBL High-Definition Imaging horn |
| Frequency Response | 30Hz - 20kHz (anechoic, manufacturer specified) |
| HDMI Input | No |
| Inputs | USB, Optical, Bluetooth, Analog, 3.5mm, AirPlay 2 |
| Optical Input | Yes |
| RCA Input | No |
| Sensitivity | 102.2dB (measured at 0.3V/1m, Erin's Audio Corner) |
| Spinorama Preference Score | 5.40 |
| Spinorama Preference Score with Perfect Sub | 6.72 |
| TRS Input | No |
| USB Input | Yes |
| Weight | 34.4 lbs (15.6 kg) (primary), 34.4 lbs (15.6 kg) (secondary) |
| Woofer Cabinet | ported |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons