Short answer: the Cambridge Audio L/R X, if you are buying new. The JBL 4329P measures as well as it (#73 vs #76 of 119 powered bookshelf speakers, 4.1/5 vs 4.1/5) but is discontinued, so only consider it used; the Cambridge Audio L/R X is still sold new at $2,399.
The case for the Cambridge Audio L/R X: Active speakers with HDMI eARC, a phono input, Wi-Fi streaming, wide even dispersion, and solid bass. 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 JBL 4329P is the deeper-bass choice. Discontinued powered horn speakers with deep bass, streaming, and Bluetooth, a convenient full range living room system. Its bass reaches about 31Hz before falling 3dB, against 43Hz for the Cambridge Audio L/R X. It supports aptX Adaptive Bluetooth, which the Cambridge Audio L/R X lacks. It keeps a wired aux input, which the Cambridge Audio L/R X lacks. 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 if you want one new; the JBL 4329P is discontinued, so only look for it used.
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Specifications Side By Side
| Cambridge Audio L/R X | JBL 4329P | |
|---|---|---|
| Price | $2,399.00 per pair | $4,500 per pair Discontinued |
| Ranked | #76 of 119 in Large Size Powered Bookshelf Speakers | #73 of 119 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 |
| Bluetooth Version | 5.1 | 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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