Short answer: the Cambridge Audio L/R S. It ranks #4 of 24 powered bookshelf speakers by sound quality, rated 4.4/5, at $549. The Kanto YU4 ranks #14, rated 3.3/5, at $479.99, $69.01 cheaper, not enough of a saving to outweigh the sound-quality gap.
What the Cambridge Audio L/R S does well: A 2-way active bookshelf pair built for near-field desktop use, with a 21mm aluminum tweeter and a 3-inch long-throw woofer on each speaker. The catch: Maximum clean output is limited: Erin’s Audio Corner measured about 86dB before the onboard limiter engages around 96dB to protect the drivers, so this is a near-field or small-room speaker rather than one built to fill a living room.
Why pick the Kanto YU4: Phono, optical and Bluetooth inputs, remote control and a subwoofer output make it convenient for a compact multi-source system. The catch: Standalone preference is only 2.89, with a -3dB point around 86Hz and a 4.2dB midrange response span.
Buy the Cambridge Audio L/R S. It is rated higher for sound quality, and saving $69.01 with the Kanto YU4 does not make up for the sound-quality gap.
Still deciding? The full Powered Home rankings cover every ranked option.
Specifications Side By Side
| Cambridge Audio L/R S | Kanto YU4 | |
|---|---|---|
| Price | $549.00 per pair | $479.99 per pair |
| Ranked | #4 of 24 in Small Size Powered Bookshelf Speakers | #14 of 24 in Small Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 57Hz (measured, Erin's Audio Corner) | - |
| Bass Extension (-10dB) | 50Hz (measured, Erin's Audio Corner) | - |
| Drivers | 21mm aluminum dome tweeter, 3" long-throw woofer | 1" silk-dome tweeter, 4" Kevlar woofer |
| Frequency Response | 55Hz - 24kHz (±3dB, manufacturer specified) | 60Hz-20kHz |
| Amplifier Power | 100W total (50W to woofer, 50W to tweeter, per speaker) | 70W RMS / 140W peak per pair |
| Inputs | RCA, optical digital, USB-C | Bluetooth, optical, RCA/phono, 3.5mm |
| Bluetooth Codecs | SBC, AAC, aptX, aptX HD | SBC, aptX |
| App | Yes | - |
| DSP | Yes, room size, wall distance, and reflective surface correction; desktop-placement and near-wall/free-space switches | - |
| Dimensions | 5.3" (134 mm) W x 226mm H x 180mm D (each) | 8.7H x 5.5W x 7.5D in |
| Weight | 6.6 lbs (3.0kg) primary speaker, 5.7 lbs (2.6kg) secondary speaker | 6.8 lbs (3.1 kg) powered / 5.5 lbs (2.5 kg) passive |
| Subwoofer Output | Yes | Yes |
| Outputs | Subwoofer, wired speaker-to-speaker link | Subwoofer |
| XLR Input | No | No |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| Optical Input | Yes | Yes |
| Coaxial Input | No | No |
| USB Input | Yes | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | Yes |
| Bluetooth | Yes | Yes, 4.0 |
| Enclosure | - | Powered 2-way, rear-ported |
| Spinorama Preference Score | - | 2.89 |
| Spinorama Preference Score with Perfect Sub | - | 5.83 |
Related Speaker Comparisons
How Cambridge Audio L/R S compares with other leading options:
- Cambridge Audio L/R S vs Audio Smile Little British Monitor
- Genelec 8010A vs Cambridge Audio L/R S
- Adam Audio D3v vs Cambridge Audio L/R S
- IK Multimedia iLoud Micro Monitor vs Cambridge Audio L/R S
- Edifier M60 vs Cambridge Audio L/R S
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 S: $549.00 per pair Amazon eBay
Pros: A 2-way active bookshelf pair built for near-field desktop use, with a 21mm aluminum tweeter and a 3-inch long-throw woofer on each speaker. Erin’s Audio Corner measured a very neutral on-axis response with good directivity control up through the 2-3kHz handoff to the tweeter, an F3 of about 57Hz and F10 of about 50Hz, and output held within roughly plus or minus 2.5dB from 80Hz to 20kHz. Horizontal dispersion of about plus or minus 60 degrees and a vertical window of about plus 30 to minus 20 degrees make it forgiving of off-center desktop seating. Two rear switches (a desktop-placement compensation switch and a near-wall/free-space switch) plus in-app DSP for room size, wall distance, and reflective surface type let you tune the in-room response rather than just hoping placement works out, and the reviewer noted an audible tightening of the bass moving between room-size settings. Rear connectivity includes RCA, optical digital, USB-C, and a dedicated subwoofer output. Measured bass extension of 57Hz (-3dB).
Cons: Maximum clean output is limited: Erin’s Audio Corner measured about 86dB before the onboard limiter engages around 96dB to protect the drivers, so this is a near-field or small-room speaker rather than one built to fill a living room. Each speaker’s Class D amplifier splits only 50W to the woofer and 50W to the tweeter, modest for the class. The DSP room-correction options are preset-based rather than a true microphone-measured calibration at the listening position, so results depend on picking settings that match your actual room.
Full Cambridge Audio L/R S review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 100W total (50W to woofer, 50W to tweeter, per speaker) |
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 50Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 57Hz (measured, Erin's Audio Corner) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, aptX, aptX HD |
| Coaxial Input | No |
| DSP | Yes, room size, wall distance, and reflective surface correction; desktop-placement and near-wall/free-space switches |
| Dimensions | 5.3" (134 mm) W x 226mm H x 180mm D (each) |
| Drivers | 21mm aluminum dome tweeter, 3" long-throw woofer |
| Frequency Response | 55Hz - 24kHz (±3dB, manufacturer specified) |
| HDMI Input | No |
| Inputs | RCA, optical digital, USB-C |
| Optical Input | Yes |
| Outputs | Subwoofer, wired speaker-to-speaker link |
| RCA Input | Yes |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | Yes |
| Weight | 6.6 lbs (3.0kg) primary speaker, 5.7 lbs (2.6kg) secondary speaker |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Cambridge Audio L/R S vs Adam Audio D3v
- Cambridge Audio L/R S vs IK Multimedia iLoud Micro Monitor
- Cambridge Audio L/R S vs Edifier M60
- Cambridge Audio L/R S vs Genelec 8010A
- Cambridge Audio L/R S vs HiVi Swan X3
- Cambridge Audio L/R S vs Audio Smile Little British Monitor
- Cambridge Audio L/R S vs Edifier MR3
- Cambridge Audio L/R S vs Sovox MiniMax3
- See all 16 comparisons
Kanto YU4: $479.99 per pair Kanto eBay
Pros: Phono, optical and Bluetooth inputs, remote control and a subwoofer output make it convenient for a compact multi-source system. ASR’s measured horizontal coverage is broad enough for some freedom of seating position. The ideal-subwoofer preference score of 5.83 indicates that bass support would materially improve its usefulness.
Cons: Standalone preference is only 2.89, with a -3dB point around 86Hz and a 4.2dB midrange response span. Response irregularities remain even after bass extension is removed from the comparison, so a subwoofer alone will not make it neutral. Sensitivity measured at an arbitrary powered-speaker gain setting is not a reliable basis for judging efficiency or maximum volume.
Full Kanto YU4 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 70W RMS / 140W peak per pair |
| Aux Input | Yes |
| Bluetooth | Yes, 4.0 |
| Bluetooth Codecs | SBC, aptX |
| Coaxial Input | No |
| Dimensions | 8.7H x 5.5W x 7.5D in |
| Drivers | 1" silk-dome tweeter, 4" Kevlar woofer |
| Enclosure | Powered 2-way, rear-ported |
| Frequency Response | 60Hz-20kHz |
| HDMI Input | No |
| Inputs | Bluetooth, optical, RCA/phono, 3.5mm |
| Optical Input | Yes |
| Outputs | Subwoofer |
| RCA Input | Yes |
| Spinorama Preference Score | 2.89 |
| Spinorama Preference Score with Perfect Sub | 5.83 |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | No |
| Weight | 6.8 lbs (3.1 kg) powered / 5.5 lbs (2.5 kg) passive |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Kanto YU4 Measurements (spinorama.org)
- Jasper Tech: Best Powered Bookshelf Speakers for Every Budget - 2025 More from Jasper Tech →
- Jasper Tech: Best Premium Computer Speakers: Kanto ORA4 Review & Comparison
- Jasper Tech: Best Desktop Computer Speakers for Every Budget
- Erin’s Audio Corner: 10 Great (and Terrible) Speakers Under $300! More from Erin’s Audio Corner →
- Head-to-Head Comparisons