Short answer: the Fluid Audio C35BT. It ranks #35 of 48 powered bookshelf speakers by sound quality, rated 3.0/5, at $139; the Fiio SP3 ranks #38, rated 2.9/5, and costs $299.99, so there is little reason to consider the other one.
Why pick the Fluid Audio C35BT: An inexpensive desktop pair with Bluetooth, balanced inputs, a front volume knob and a headphone jack for a basic computer setup. The tradeoff: Preference scores of 2.57 standalone and 5.57 with an ideal subwoofer indicate that the limitations are not just missing bass.
The Fiio SP3 is the more accurate pick. Small angled desktop speakers that fit a tight desk and reach a little deeper in the bass than many similar sized pairs. Its measured preference score, a predictor of how neutral it sounds, is 3.56 against 2.57 for the Fluid Audio C35BT. Watch for: The response rises strongly toward the treble, about 1.13dB per octave, with a recessed midrange and problematic crossover behavior.
Buy the Fluid Audio C35BT. It is rated higher for sound quality than the Fiio SP3 and costs less, so only choose the other one for a particular feature it does better.
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Specifications Side By Side
| Fluid Audio C35BT | Fiio SP3 | |
|---|---|---|
| Price | $139.00 per pair | $299.99 per pair |
| Ranked | #35 of 48 in Small Size Powered Bookshelf Speakers | #38 of 48 in Small Size Powered Bookshelf Speakers |
| Enclosure | Powered 2-way, front-ported | - |
| Drivers | 0.8” silk-dome tweeter, 3.5” composite woofer | 3.5” carbon fiber midwoofer, 1” silk dome tweeter |
| Amplifier Power | 64W total | 40W total (30W midwoofer + 10W tweeter) |
| Inputs | Bluetooth, RCA, 3.5mm, balanced TRS | AUX, RCA |
| Outputs | Headphone | - |
| Dimensions | 7.3H x 4.9W x 5.9D in | 6.4”H x 4.7”W x 5.2”D (163 x 120 x 132 mm) |
| Spinorama Preference Score | 2.57 | 3.56 |
| Spinorama Preference Score with Perfect Sub | 5.57 | 6.17 |
| Headphone Output | Yes | - |
| XLR Input | No | No |
| RCA Input | Yes | Yes |
| TRS Input | Yes | 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 |
| Weight | 10 lbs (4.52 kg) pair | 4.3 lbs (1.95 kg) each |
| Bluetooth | Yes | No |
| Bluetooth Version | 5.0 | - |
| Frequency Response | 80Hz - 20kHz (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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