Short answer: the Monacor SOUND-4BT on measured sound quality, the Fluid Audio C35BT on price. The Monacor SOUND-4BT ranks #13 of 24 powered bookshelf speakers, rated 3.3/5, at $310. The Fluid Audio C35BT ranks #19, rated 3.0/5, at $139, $171 cheaper.
The case for the Monacor SOUND-4BT: 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.
What the Fluid Audio C35BT does well: Balanced TRS inputs, Bluetooth, front volume control and a headphone output make this inexpensive pair practical for a basic desktop setup. Watch for: Preference scores of 2.57 standalone and 5.57 with an ideal subwoofer indicate that the limitations are not just missing bass.
Buy the Monacor SOUND-4BT when sound quality outweighs the price for you, and the Fluid Audio C35BT when the price outweighs sound quality instead.
Want more options? Browse the full Powered Home rankings.
Specifications Side By Side
| Monacor SOUND-4BT | Fluid Audio C35BT | |
|---|---|---|
| Price | $310 per pair | $139 per pair |
| Ranked | #13 of 24 in Small Size Powered Bookshelf Speakers | #19 of 24 in Small Size Powered Bookshelf Speakers |
| Enclosure | 2-way powered stereo pair, bass reflex | Powered 2-way, front-ported |
| Drivers | 1" dome tweeter, 4" woofer | 0.8" silk-dome tweeter, 3.5" composite woofer |
| Dimensions | 8.5H x 5.5W x 6.7D in | 7.3H x 4.9W x 5.9D in |
| Weight | 11.5 lbs (5.2 kg)/pair | 10 lbs (4.52 kg) pair |
| Amplifier Power | 2 x 30W RMS | 64W total |
| Inputs | Bluetooth 4.0 aptX, optical, RCA, 3.5mm | Bluetooth, RCA, 3.5mm, balanced TRS |
| Bluetooth Codecs | SBC, aptX | - |
| Spinorama Preference Score | 3.58 | 2.57 |
| Spinorama Preference Score with Perfect Sub | 6.10 | 5.57 |
| Subwoofer Output | Yes | - |
| Outputs | Subwoofer | Headphone |
| XLR Input | No | No |
| RCA Input | Yes | Yes |
| TRS Input | No | Yes |
| Optical Input | Yes | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | Yes | Yes |
| Bluetooth | Yes, 4.0 | Yes, 5.0 |
| Frequency Response | 45Hz - 20kHz (Manufacturer specified) | 80Hz - 20kHz (Manufacturer specified) |
| Headphone Output | - | Yes |
Related Speaker Comparisons
How Monacor SOUND-4BT compares with other leading options:
- Cambridge Audio L/R S vs Monacor SOUND-4BT
- HiVi Swan X3 vs Monacor SOUND-4BT
- Sovox MiniMax3 vs Monacor SOUND-4BT
- Bowers & Wilkins Formation Flex vs Monacor SOUND-4BT
- Monacor SOUND-4BT vs Audioengine A2+
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
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
Fluid Audio C35BT: $139 per pair Amazon eBay
Pros: Balanced TRS inputs, Bluetooth, front volume control and a headphone output make this inexpensive pair practical for a basic desktop setup. ASR’s measured -3dB point is about 78Hz, so it covers more upper bass than the shallowest-reaching mini speakers.
Cons: Preference scores of 2.57 standalone and 5.57 with an ideal subwoofer indicate that the limitations are not just missing bass. Listening-window narrow-band deviation of 0.555 and sound-power deviation of 0.657 show that response irregularities affect both direct and room-reflected sound. A subwoofer cannot correct those tonal problems, and the small drivers are not a basis for expecting high clean output.
Full Fluid Audio C35BT review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 64W total |
| Aux Input | Yes |
| Bluetooth | Yes, 5.0 |
| Coaxial Input | No |
| Dimensions | 7.3H x 4.9W x 5.9D in |
| Drivers | 0.8" silk-dome tweeter, 3.5" composite woofer |
| Enclosure | Powered 2-way, front-ported |
| Frequency Response | 80Hz - 20kHz (Manufacturer specified) |
| HDMI Input | No |
| Headphone Output | Yes |
| Inputs | Bluetooth, RCA, 3.5mm, balanced TRS |
| Optical Input | No |
| Outputs | Headphone |
| RCA Input | Yes |
| Spinorama Preference Score | 2.57 |
| Spinorama Preference Score with Perfect Sub | 5.57 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 10 lbs (4.52 kg) pair |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Fluid Audio C35BT vs Mackie CR3-X
- Fluid Audio C35BT vs Fiio SP3
- Fluid Audio C35BT vs M-Audio BX3
- Fluid Audio C35BT vs Audioengine HD3
- Fluid Audio C35BT vs Monoprice Monolith MM-3
- Fluid Audio C35BT vs Presonus Eris E3.5 2nd Gen
- Fluid Audio C35BT vs Midiplus MI3 II
- Fluid Audio C35BT vs Klipsch ProMedia Lumina
- See all 9 comparisons