Fosi Audio BT20A Bluetooth Stereo Amplifier
- Bluetooth amplifier, per the listed item type
- 24V 4.5A power supply included
- 24-month manufacturer warranty
- 1.5 lb, amplifier only
Last refreshed Jun 20, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A light Bluetooth amplifier for adding wireless playback to speakers you already own. The spec sheet is thin, with no output rating or channel count, so check the maker's figures before wiring it up.
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ASIN: B07BQC7GNLModel: BT20ACategory: Stereo Amplifiers
Overview
A garage bench, a bookshelf corner or a small den is where the Fosi Audio amplifier is meant to work: a compact Bluetooth unit that receives audio from a paired device and powers the speakers wired to it. It runs from the external power supply packed in the box.
Wireless input and a light build make it an easy way to bring old speakers back into use. Almost every performance figure is missing from the listing, so matching it to a given speaker comes down to the manufacturer documentation.
Who it's for
Suited to a workshop, garage or spare room where existing speakers need a wireless feed with little setup. Shoppers who expect speakers in the box, or who need published power figures, should look elsewhere.
Pros and cons
- Bluetooth input built in
- Power supply included in the box
- Light, easy to move between rooms
- Manufacturer warranty stated
- Output power and channel count not listed
- Speakers and speaker wire sold separately
- External power brick takes extra space
Performance notes
Loudness and clarity depend on the speakers connected and on how much current the supplied power supply can deliver. Bluetooth stability depends on walls and distance between the source device and the amplifier. Without a listed output rating, headroom with hard to drive speakers is unknown.
Specifications
| Brand | Fosi Audio |
|---|---|
| Model | BT20A |
| Warranty Description | 2 years |
| Unit Count | 1 |
| Item Weight | 1.5 pounds |
| Mfr Part Number | BT20A |
| Item Type Name | Bluetooth Amplifier |
Frequently asked questions
Is the Fosi Audio BT20A a powered speaker?
No.
How much output power does the Fosi Audio BT20A deliver?
The specs on this listing do not state an output rating or a channel count. Check the manufacturer documentation before matching it to speakers.
How does a phone connect to the BT20A?
It is a Bluetooth amplifier, so the phone pairs with it wirelessly. Other inputs are not described in the listing.