Short answer: the Monoprice Monolith MM-3. It ranks #28 of 48 powered bookshelf speakers by sound quality, rated 3.2/5, at $299.99; the Fiio SP3 ranks #38, rated 2.9/5, at $299.99. The price gap is small enough that the sound-quality ranking should decide it.
The Monoprice Monolith MM-3 is the better-sounding option. A compact desktop pair with Bluetooth, analog inputs, a headphone jack and angled stands. The catch: Its measurements and rating are for the ports plugged; left stock, the bass has a boomy peak and the midrange has more resonances.
The case for the Fiio SP3: Small angled desktop speakers that fit a tight desk and reach a little deeper in the bass than many similar sized pairs. The tradeoff: The response rises strongly toward the treble, about 1.13dB per octave, with a recessed midrange and problematic crossover behavior.
Buy the Monoprice Monolith MM-3. It is rated higher for sound quality than the Fiio SP3 at the same price, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Powered Home rankings cover every ranked option.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| Monoprice Monolith MM-3 | Fiio SP3 | |
|---|---|---|
| Price | $299.99 per pair | $299.99 per pair |
| Ranked | #28 of 48 in Small Size Powered Bookshelf Speakers | #38 of 48 in Small Size Powered Bookshelf Speakers |
| Enclosure | 2-way active, rear slot port | - |
| Drivers | 0.75” silk-dome tweeter, 3” polypropylene woofer | 3.5” carbon fiber midwoofer, 1” silk dome tweeter |
| Dimensions | 8.3H x 5.5W x 6.3D in | 6.4”H x 4.7”W x 5.2”D (163 x 120 x 132 mm) |
| Weight | approx. 7.9 lbs (3.6 kg) each | 4.3 lbs (1.95 kg) each |
| Amplifier Power | 50W total, bi-amplified | 40W total (30W midwoofer + 10W tweeter) |
| Inputs | Bluetooth aptX, RCA, 3.5mm | AUX, RCA |
| Bluetooth Codecs | SBC, aptX | - |
| Country | United States (design) | - |
| Spinorama Preference Score | 3.82 | 3.56 |
| Spinorama Preference Score with Perfect Sub | 6.24 | 6.17 |
| XLR Input | No | No |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | Yes | Yes |
| Bluetooth | Yes | No |
| Frequency Response | 50Hz - 22kHz (Manufacturer specified) | 65Hz - 20kHz (±2dB) (Manufacturer specified) |
| Bass Extension (-3dB) | - | 59Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | - | 53Hz (measured, Erin’s Audio Corner) |
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