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 Monacor SOUND-4BT ranks #13, rated 3.3/5, at $310, $239 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 tradeoff: 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.
What the Monacor SOUND-4BT does well: The available measurements suggest useful bass for its size, with a -3dB point around 61Hz, and a fairly small 2.8dB response span from 300Hz to 5kHz. Watch for: Predicted in-room response remains uneven despite the modest midrange span.
Buy the Cambridge Audio L/R S. It is rated higher for sound quality, and saving $239 with the Monacor SOUND-4BT does not make up for the sound-quality gap.
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Specifications Side By Side
| Cambridge Audio L/R S | Monacor SOUND-4BT | |
|---|---|---|
| Price | $549.00 per pair | $310 per pair |
| Ranked | #4 of 24 in Small Size Powered Bookshelf Speakers | #13 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" dome tweeter, 4" woofer |
| Frequency Response | 55Hz - 24kHz (±3dB, manufacturer specified) | 45Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 100W total (50W to woofer, 50W to tweeter, per speaker) | 2 x 30W RMS |
| Inputs | RCA, optical digital, USB-C | Bluetooth 4.0 aptX, optical, RCA, 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) | 8.5H x 5.5W x 6.7D in |
| Weight | 6.6 lbs (3.0kg) primary speaker, 5.7 lbs (2.6kg) secondary speaker | 11.5 lbs (5.2 kg)/pair |
| 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 | - | 2-way powered stereo pair, bass reflex |
| Spinorama Preference Score | - | 3.58 |
| Spinorama Preference Score with Perfect Sub | - | 6.10 |
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
Monacor SOUND-4BT: $310 per pair LTT Versand eBay
Pros: The available measurements suggest useful bass for its size, with a -3dB point around 61Hz, and a fairly small 2.8dB response span from 300Hz to 5kHz. Optical and analog inputs, Bluetooth, remote control and a subwoofer output make it versatile for a compact stereo setup.
Cons: Predicted in-room response remains uneven despite the modest midrange span. A subwoofer can add bass reach but does not correct the remaining tonal variations.
Full Monacor SOUND-4BT review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 2 x 30W RMS |
| Aux Input | Yes |
| Bluetooth | Yes, 4.0 |
| Bluetooth Codecs | SBC, aptX |
| Coaxial Input | No |
| Dimensions | 8.5H x 5.5W x 6.7D in |
| Drivers | 1" dome tweeter, 4" woofer |
| Enclosure | 2-way powered stereo pair, bass reflex |
| Frequency Response | 45Hz - 20kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | Bluetooth 4.0 aptX, optical, RCA, 3.5mm |
| Optical Input | Yes |
| Outputs | Subwoofer |
| RCA Input | Yes |
| Spinorama Preference Score | 3.58 |
| Spinorama Preference Score with Perfect Sub | 6.10 |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | No |
| Weight | 11.5 lbs (5.2 kg)/pair |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Monacor SOUND-4BT vs Kanto YU4
- Monacor SOUND-4BT vs Audioengine A2+
- Monacor SOUND-4BT vs Bowers & Wilkins Formation Flex
- Monacor SOUND-4BT vs Klipsch ProMedia Lumina
- Monacor SOUND-4BT vs Monoprice Monolith MM-3
- Monacor SOUND-4BT vs Sovox MiniMax3
- Monacor SOUND-4BT vs Audioengine HD3
- Monacor SOUND-4BT vs HiVi Swan X3
- See all 10 comparisons