Fosi Audio BT30D Pro 2.1 Bluetooth Subwoofer Amplifier
- 2.1 channel amp, 165W x 2 + 350W
- 2 Texas Instruments TPA3255 Class-D chips
- Passive speaker and subwoofer outputs
- Sub frequency 0 to 300 Hz, separate sub volume
- Bluetooth 5.0, up to 15 meters
- 32V/5A power supply and Bluetooth antenna included
- 24 month warranty
Last refreshed Jun 20, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact amplifier that drives two passive speakers and a passive subwoofer from one all metal box, with Bluetooth and dedicated sub controls. Wired inputs are not described, so confirm how your sources connect.
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ASIN: B09YNBHR73Model: BT30D ProCategory: Stereo Amplifiers
Overview
Texas Instruments Class-D chips power this Fosi Audio amplifier, driving a pair of passive speakers and a passive subwoofer from one small all metal chassis. Dedicated knobs set the subwoofer frequency and level, and Bluetooth streams from a phone.
Buy it to build a desktop or bookshelf system with a real passive subwoofer and no full AV receiver. The bullets describe Bluetooth only, so wired source inputs need confirming, and the box dimensions are not given.
Who it's for
Hobbyists pairing passive bookshelf speakers with a passive sub get one box that powers all three. Owners of powered speakers or an active subwoofer need a different amplifier, since the outputs here are passive.
Pros and cons
- Powers a passive subwoofer directly
- High output Class-D chips
- Adjustable subwoofer frequency
- Separate subwoofer volume
- Wired inputs not described
- Passive outputs only
Performance notes
Clean power comes from the Class-D chips running off the included power supply, while the sub frequency knob sets where the main speakers hand bass to the subwoofer. The sub volume knob balances it against the mains for the room.
Specifications
| Brand | Fosi Audio |
|---|---|
| Model | BT30D Pro |
| Dimensions & fit | |
| Item weight | 1.5 pounds |
| Capacity & performance | |
| Output Power | 165W x 2 + 350W |
| Outputs | 2 sets passive speaker, 1 set passive subwoofer |
| Power & efficiency | |
| Power supply | 32V/5A |
| Construction & materials | |
| Enclosure Material | All metal |
| Included components | |
| Included Components | Amplifier, 32V/5A power supply, Bluetooth antenna, user manual |
| Warranty & support | |
| Warranty Description | 24 month manufacturer |
| Other details | |
| Number of Channels | 2.1 |
| Amplifier chips | 2 x Texas Instruments TPA3255, Class-D |
| Subwoofer frequency | 0 to 300 Hz |
| Bluetooth | 5.0, up to 15 meters |
Frequently asked questions
Can the Fosi BT30D Pro power a passive subwoofer?
Yes. It has one set of passive subwoofer outputs alongside two sets of passive speaker outputs, with the subwoofer frequency adjustable from 0 to 300 Hz.
What power supply comes with the Fosi BT30D Pro?
A 32V/5A power supply is included, along with a Bluetooth antenna and a user manual.
Does the Fosi BT30D Pro work with powered speakers?
The listing describes passive speaker and passive subwoofer outputs only.