Short answer: the Audioengine HD3 for better sound quality, the Fluid Audio C35BT for the lower price. The Audioengine HD3 ranks #17 of 24 powered bookshelf speakers, rated 3.2/5, at $359. The Fluid Audio C35BT ranks #19, rated 3.0/5, at $139, $220 cheaper.
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. 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 case for the Audioengine HD3: A compact desktop stereo option when cabinet size is a priority. The catch: Limited bass makes a subwoofer useful for fuller music reproduction.
Buy the Fluid Audio C35BT if the price matters more than sound quality. Buy the Audioengine HD3 if sound quality matters more than the price.
Still deciding? The full Powered Home rankings cover every ranked option.
Specifications Side By Side
| Fluid Audio C35BT | Audioengine HD3 | |
|---|---|---|
| Price | $139 per pair | $359.00 per pair |
| Ranked | #19 of 24 in Small Size Powered Bookshelf Speakers | #17 of 24 in Small Size Powered Bookshelf Speakers |
| Enclosure | Powered 2-way, front-ported | - |
| Drivers | 0.8" silk-dome tweeter, 3.5" composite woofer | 2.75" woofer, 0.75" silk dome tweeter |
| Amplifier Power | 64W total | 30W total (15W per speaker) |
| Inputs | Bluetooth, RCA, 3.5mm, balanced TRS | Bluetooth, Aux, RCA Input |
| Outputs | Headphone | RCA variable output (subwoofer) |
| Dimensions | 7.3H x 4.9W x 5.9D in | 9"H x 5.5"W x 6.5"D (228.6 x 139.7 x 165.1 mm) |
| Spinorama Preference Score | 2.57 | - |
| Spinorama Preference Score with Perfect Sub | 5.57 | - |
| 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 | 7.3 lbs (3.3 kg) |
| Bluetooth | Yes, 5.0 | Yes |
| Frequency Response | 80Hz - 20kHz (Manufacturer specified) | 65 Hz-20 kHz (-3dB) (Manufacturer specified) |
| App | - | No |
| Bass Extension (-10dB) | - | 58Hz |
| Bass Extension (-3dB) | - | 65Hz |
| Bluetooth Codecs | - | SBC, aptX |
| Bluetooth Version | - | 5.0 |
| EQ | - | No |
| Maximum SPL | - | 90dB @ 1m (manufacturer specified) |
| Subwoofer Output | - | Yes |
Related Speaker Comparisons
How Audioengine HD3 compares with other leading options:
- Audioengine HD3 vs Genelec 8010A
- Adam Audio D3v vs Audioengine HD3
- Cambridge Audio L/R S vs Audioengine HD3
- Audioengine HD3 vs IK Multimedia iLoud Micro Monitor
- Audioengine HD3 vs Edifier M60
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
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 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
- Fluid Audio C35BT vs Monoprice DT-3
- See all 9 comparisons
Audioengine HD3: $359.00 per pair Amazon eBay
Pros: A compact desktop stereo option when cabinet size is a priority. Measured bass extension of 65Hz (-3dB).
Cons: Limited bass makes a subwoofer useful for fuller music reproduction. Its compact format is better suited to close listening than filling a large room.
Full Audioengine HD3 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 30W total (15W per speaker) |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 58Hz |
| Bass Extension (-3dB) | 65Hz |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, aptX |
| Bluetooth Version | 5.0 |
| Coaxial Input | No |
| Dimensions | 9"H x 5.5"W x 6.5"D (228.6 x 139.7 x 165.1 mm) |
| Drivers | 2.75" woofer, 0.75" silk dome tweeter |
| EQ | No |
| Frequency Response | 65 Hz-20 kHz (-3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | Bluetooth, Aux, RCA Input |
| Maximum SPL | 90dB @ 1m (manufacturer specified) |
| Optical Input | No |
| Outputs | RCA variable output (subwoofer) |
| RCA Input | Yes |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | No |
| Weight | 7.3 lbs (3.3 kg) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Audioengine HD3 vs Monoprice Monolith MM-3
- Audioengine HD3 vs Kanto YU4
- Audioengine HD3 vs Monacor SOUND-4BT
- Audioengine HD3 vs M-Audio BX3
- Audioengine HD3 vs Presonus Eris E3.5 2nd Gen
- Audioengine HD3 vs Bowers & Wilkins Formation Flex
- Audioengine HD3 vs Midiplus MI3 II
- Audioengine HD3 vs Edifier MR3
- See all 18 comparisons