Short answer: the Monacor SOUND-4BT. It ranks #13 of 24 powered bookshelf speakers by sound quality, rated 3.3/5, at $310. The Monoprice Monolith MM-3 ranks #16, rated 3.2/5, at $299.99, $10.01 cheaper, which does not close the gap in sound quality.
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. The catch: Predicted in-room response remains uneven despite the modest midrange span.
The case for the Monoprice Monolith MM-3: With the ports plugged, Erin’s Klippel data yields preference scores of 3.82 standalone and 6.24 with an ideal subwoofer, and a measured -3dB point around 62Hz. The tradeoff: These measurements describe modified, port-plugged speakers, not the stock product.
Buy the Monacor SOUND-4BT. It is rated higher for sound quality, and the $10.01 you would save on the Monoprice Monolith MM-3 does not close the gap.
Still deciding? The full Powered Home rankings cover every ranked option.
Specifications Side By Side
| Monacor SOUND-4BT | Monoprice Monolith MM-3 | |
|---|---|---|
| Price | $310 per pair | $299.99 per pair |
| Ranked | #13 of 24 in Small Size Powered Bookshelf Speakers | #16 of 24 in Small Size Powered Bookshelf Speakers |
| Enclosure | 2-way powered stereo pair, bass reflex | 2-way active, rear slot port |
| Drivers | 1" dome tweeter, 4" woofer | 0.75" silk-dome tweeter, 3" polypropylene woofer |
| Dimensions | 8.5H x 5.5W x 6.7D in | 8.3H x 5.5W x 6.3D in |
| Weight | 11.5 lbs (5.2 kg)/pair | approx. 7.9 lbs (3.6 kg) each |
| Amplifier Power | 2 x 30W RMS | 50W total, bi-amplified |
| Inputs | Bluetooth 4.0 aptX, optical, RCA, 3.5mm | Bluetooth aptX, RCA, 3.5mm |
| Bluetooth Codecs | SBC, aptX | SBC, aptX |
| Spinorama Preference Score | 3.58 | 3.82 |
| Spinorama Preference Score with Perfect Sub | 6.10 | 6.24 |
| Subwoofer Output | Yes | - |
| Outputs | Subwoofer | - |
| XLR Input | No | No |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| 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 |
| Frequency Response | 45Hz - 20kHz (Manufacturer specified) | 50Hz - 22kHz (Manufacturer specified) |
| Country | - | United States (design) |
Related Speaker Comparisons
More worthwhile head-to-heads for Monacor SOUND-4BT:
- 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 Sovox MiniMax3
- Monacor SOUND-4BT vs Audioengine HD3
- Monacor SOUND-4BT vs HiVi Swan X3
- Monacor SOUND-4BT vs Fluid Audio C35BT
- See all 10 comparisons
Monoprice Monolith MM-3: $299.99 per pair Monoprice eBay
Pros: With the ports plugged, Erin’s Klippel data yields preference scores of 3.82 standalone and 6.24 with an ideal subwoofer, and a measured -3dB point around 62Hz. The reviewer found blocking the ports improved the bass peak and midrange resonances. Bluetooth, analog inputs, a headphone jack and angled stands provide a convenient compact desktop package.
Cons: These measurements describe modified, port-plugged speakers, not the stock product. Even in that configuration the review identifies substantial tonal problems and recommends off-axis placement to reduce excess treble. The score therefore does not justify ranking the stock MM-3 alongside better-balanced monitors. Small drivers limit its application, and the proprietary inter-speaker cable complicates replacement.
Full Monoprice Monolith MM-3 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 50W total, bi-amplified |
| Aux Input | Yes |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, aptX |
| Coaxial Input | No |
| Country | United States (design) |
| Dimensions | 8.3H x 5.5W x 6.3D in |
| Drivers | 0.75" silk-dome tweeter, 3" polypropylene woofer |
| Enclosure | 2-way active, rear slot port |
| Frequency Response | 50Hz - 22kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | Bluetooth aptX, RCA, 3.5mm |
| Optical Input | No |
| RCA Input | Yes |
| Spinorama Preference Score | 3.82 |
| Spinorama Preference Score with Perfect Sub | 6.24 |
| TRS Input | No |
| USB Input | No |
| Weight | approx. 7.9 lbs (3.6 kg) each |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Monoprice Monolith MM-3 vs Klipsch ProMedia Lumina
- Monoprice Monolith MM-3 vs Audioengine HD3
- Monoprice Monolith MM-3 vs Kanto YU4
- Monoprice Monolith MM-3 vs Fluid Audio C35BT
- Monoprice Monolith MM-3 vs Audioengine A2+
- Monoprice Monolith MM-3 vs Fiio SP3
- Monoprice Monolith MM-3 vs Bowers & Wilkins Formation Flex
- Monoprice Monolith MM-3 vs Monoprice DT-3
- See all 9 comparisons