Fosi Audio BT20A Pro
- 51 reviews
- Fosi Audio
Fosi Audio BT20A Pro
- 51 reviews
- Fosi Audio
$105.90
- Authorized Dealer · Tech Support · 30-Day Returns
Why it stands out
Best for
Not ideal for
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Setup guide
How to connect
What you should know
EMiUZEK buying notes
Frequently asked questions
View full technical specifications
Official product information provided by Fosi Audio
The following product descriptions, specifications and images are provided by the manufacturer.
Fosi Audio BT20A Pro is a compact Bluetooth stereo integrated amplifier built around the TI TPA3255 for passive speakers.
It adds RCA input, a variable 3.5 mm pre-out, bass and treble controls, replaceable op-amps and multiple power-supply options for a flexible desktop or room stereo system.
Why it stands out
TPA3255 stereo amplification
Delivers high-efficiency Class-D power with low specified distortion in a compact chassis.
Variable pre-out expansion
The 3.5 mm pre-out can feed compatible powered speakers, a powered subwoofer or another amplifier.
Replaceable op-amps
Socketed NE5532 op-amps allow experienced users to tailor the analog stage with compatible DIP8 replacements.
Flexible power configurations
Available power-supply choices let buyers balance system output, size and cost.
Best for
- Desktop and bookshelf passive-speaker systems
- Compact stereo systems with a powered subwoofer
- Bluetooth and RCA source switching
- Users interested in compatible op-amp rolling
Not ideal for
- Systems requiring HDMI ARC, optical or USB input
- Users needing a headphone output
- Turntables without a phono preamplifier
EMiUZEK Buying Notes
- Maximum power depends on the selected supply and speaker load; choose the power-supply variant appropriate for the system.
- The 3.5 mm connector is a pre-out, not a headphone jack.
- Bluetooth takes input priority; disconnect Bluetooth when using RCA if the wired source is not heard.
Frequently asked questions
Can it power passive speakers?
Yes. It supports 2–8 Ω passive speakers.
Can it connect to a powered subwoofer?
Yes, through the variable 3.5 mm pre-out using the appropriate cable.
Is the pre-out a headphone output?
No.
Can I connect a turntable?
Yes only through a turntable with line output or an external phono stage.
Does it support aptX?
No. The official documentation specifies SBC/AAC and states that aptX variants are not supported.
Can RCA and Bluetooth play simultaneously?
No. Only one input mode is used at a time.
HOW TO CONNECT
Passive speaker system
Source icon: streamer
Source: Streamer / DAC / phone
Connection: RCA or Bluetooth
Output connection: Speaker terminals
Target icon: speakers
Output: Passive speakers
2.1 stereo system
Source icon: streamer
Source: Streamer / DAC
Connection: RCA
Output connection: Speaker terminals + 3.5 mm pre-out
Target icon: speakers
Output: Passive speakers + powered subwoofer
Pre-out expansion system
Source icon: streamer
Source: Streamer / DAC / phone
Connection: RCA or Bluetooth
Output connection: 3.5 mm variable pre-out
Target icon: speakers
Output: Powered speakers, powered subwoofer or downstream amplifier
Note: Confirm input compatibility and begin with the volume set low.
Technical Specifications
Inputs
| Feature | Specification |
|---|---|
| Bluetooth 5.0 | Included |
| RCA line input | Included |
Outputs
| Feature | Specification |
|---|---|
| Stereo speaker binding posts | Included |
| 3.5 mm variable pre-out | Included |
Amplification
| Feature | Specification |
|---|---|
| Amplifier Chip | TI TPA3255 |
| Maximum Output Power | 300 W × 2 at 4 Ω |
| Speaker Impedance | 2–8 Ω |
| THD | ≤0.005% |
| SNR | ≥108 dB |
| Frequency Response | 20 Hz–20 kHz (±1.2 dB) |
| Socketed Op-Amps | 2 × NE5532 |
Connectivity and power
| Feature | Specification |
|---|---|
| Bluetooth Codecs | SBC / AAC |
| Bluetooth Range | up to 50 ft without obstacles |
| DC Input Range | 24–48 V |
| Power Supply Options | 32 V / 5 A or 48 V / 5 A, depending on variant |
| Dimensions | approximately 5 × 5 × 1 in |
Additional Product Content
Comparison: BT20A or BT20A Pro?
| Feature | BT20A | BT20A Pro |
|---|---|---|
| Amplifier chip | Dual TPA3116D2 | TPA3255 |
| Maximum output | 100 W × 2 | 300 W × 2 at 4 Ω |
| Pre-out | No | 3.5 mm variable pre-out |
| Best use | Simple compact stereo | Higher-output expandable stereo |
What's in the box, manuals and downloads
Shipping, warranty and returns
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We provide tracked international shipping with delivery options and estimated delivery times shown during checkout.
Official Warranty Support
All products sold by EMIUZEK are genuine products with manufacturer warranty support.
Our HiFi specialists provide assistance with compatibility, setup, and technical questions.
Easy Returns
Eligible returns are available according to our return policy.
Please contact EMIUZEK before returning any product so we can provide assistance.
