Short answer: the Cambridge Audio L/R X if sound quality matters most, the Presonus Eris Studio 8 if price matters most. The Cambridge Audio L/R X ranks #47 of 67 powered bookshelf speakers at $2399. The Presonus Eris Studio 8 ranks #58 at $462, $1937 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 Presonus Eris Studio 8 offers: An 8-inch active monitor with XLR, TRS and RCA inputs and room-adjustment controls, providing flexible analog integration. Its cabinet and connection options suit a conventional studio setup. Watch for: The large cabinet requires substantial desk or stand space. Analog room-adjustment controls offer less flexibility than automatic calibration or parametric correction.
Buy the Cambridge Audio L/R X if sound quality matters more than the price. Buy the Presonus Eris Studio 8 if the price matters more than sound quality.
Skip the Presonus Eris Studio 8 if sound quality matters to you. It ranks near the bottom of the 67 powered bookshelf speakers.
Want more options? Browse the full Powered Home rankings.
Specifications Side By Side
| Cambridge Audio L/R X | Presonus Eris Studio 8 | |
|---|---|---|
| Price | $2,399.00 per pair | $924 per pair |
| Ranked | #47 of 67 in Large Size Powered Bookshelf Speakers | #58 of 67 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 43Hz (measured, Erin's Audio Corner) | - |
| Bass Extension (-10dB) | 37Hz (measured, Erin's Audio Corner) | - |
| Drivers | 28mm aluminum tweeter, 2x 5" mid-woofers, 2x 6" side-firing passive radiators | 8" (203mm) woofer |
| Frequency Response | 35Hz - 24kHz (±3dB, manufacturer specified) | 35Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 800W total (400W per speaker) | 140w Per Speaker |
| Inputs | HDMI eARC, RCA aux, RCA phono (MM), optical digital, USB-C, USB-A, Ethernet, Wi-Fi | TRS, XLR, RCA |
| 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 9.8"W x 11.7"D (419.1 x 248.9 x 297.2 mm) |
| Weight | 22.9 lbs (10.4kg) each | 22.3 lbs (10.1 kg) each |
| Subwoofer Output | Yes | - |
| Outputs | Subwoofer | - |
| Bluetooth | - | No |
| EQ | - | Yes (Room adjustment) |
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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 |
- Links
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Presonus Eris Studio 8: $924 per pair Amazon eBay
Pros: An 8-inch active monitor with XLR, TRS and RCA inputs and room-adjustment controls, providing flexible analog integration. Its cabinet and connection options suit a conventional studio setup.
Cons: The large cabinet requires substantial desk or stand space. Analog room-adjustment controls offer less flexibility than automatic calibration or parametric correction.
Full Presonus Eris Studio 8 review and specifications →
| Amplifier Power | 140w Per Speaker |
|---|---|
| App | No |
| Bluetooth | No |
| DSP | No |
| Dimensions | 16.5"H x 9.8"W x 11.7"D (419.1 x 248.9 x 297.2 mm) |
| Drivers | 8" (203mm) woofer |
| EQ | Yes (Room adjustment) |
| Frequency Response | 35Hz - 20kHz (Manufacturer specified) |
| Inputs | TRS, XLR, RCA |
| Weight | 22.3 lbs (10.1 kg) each |
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