Fosi Audio T20
- 2 reviews
- Fosi Audio
Fosi Audio T20
- 2 reviews
- Fosi Audio
$99.37
- Authorized Dealer · Tech Support · 30-Day Returns
Why it stands out
Best for
Not ideal for
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Setup guide
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What you should know
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Frequently asked questions
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Official product information provided by Fosi Audio
The following product descriptions, specifications and images are provided by the manufacturer.
Fosi Audio T20 is a compact Bluetooth tube integrated amplifier for passive speakers and wired headphones.
It combines 50W x2 Class D speaker power with replaceable vacuum tubes, RCA input and tone controls for a warm, flexible desktop stereo system.
Why it stands out
Four reasons this product deserves a place in a well-planned audio system.
Tube-Buffered Sound
Replaceable vacuum tubes add the tube stage and allow compatible tube rolling.
Speaker and Headphone Listening
The T20 powers passive speakers and also provides a front 3.5mm headphone output.
Bluetooth and RCA Inputs
Switch between convenient wireless playback and a conventional analog source.
Compact Tone Control
Independent bass and treble controls make it easier to adapt the system to speakers, headphones and room acoustics.
Best for
- Desktop passive-speaker systems
- Bluetooth music playback
- Headphone and speaker listening from one compact amplifier
- Listeners interested in compatible tube rolling
Not ideal for
- Users requiring optical, USB or HDMI inputs
- Balanced XLR audio systems
- Turntables without a built-in or external phono preamp
- Users needing a dedicated subwoofer output
EMiUZEK Buying Notes
- T20 is an integrated speaker amplifier and can directly drive compatible 4–8Ω passive speakers.
- Its RCA input is line level; a conventional turntable requires a separate phono preamplifier.
- The 3.5mm jack is a headphone output, not a microphone connection.
Frequently Asked Questions
Can the T20 drive passive speakers directly?
Yes. Connect a compatible 4–8Ω passive speaker pair to the rear speaker terminals.
Can I connect a turntable?
Yes only when the turntable has a built-in phono preamp or is used with an external phono preamp.
Does it work as a headphone amplifier?
Yes, it includes a front 3.5mm headphone output.
Does it accept digital audio?
No. Inputs are Bluetooth and analog RCA; optical and USB audio are not provided.
Can the tubes be replaced?
Yes. Use only compatible tube types and power the unit off before replacement.
Does it have a subwoofer output?
No dedicated subwoofer output is specified. Use a subwoofer integration method supported by your wider system.
HOW TO CONNECT
Bluetooth speaker system
Source: Phone / tablet
Connection: Bluetooth
Output: Speaker terminals
Target: Passive speakers
Note: Pair the source and set volume low before playback.
Wired stereo system
Source: DAC / streamer / CD player
Connection: RCA line input
Output: Speaker terminals
Target: Passive speakers
Note: Use a fixed or controlled line-level source.
Headphone listening
Source: Phone via Bluetooth or RCA source
Connection: Bluetooth / RCA
Output: 3.5mm headphone output
Target: Wired headphones
Note: Lower volume before inserting headphones.
Technical Specifications
Amplifier
| Feature | Specification |
|---|---|
| Product Type | Bluetooth tube integrated amplifier |
| Amplifier Chip | TI TPA3116 |
| Maximum Speaker Output | 50W x2 at 4Ω |
| Speaker Impedance | 4–8Ω |
Connectivity
| Feature | Specification |
|---|---|
| Inputs | Bluetooth 5.0; RCA line input |
| Outputs | Passive speaker terminals; 3.5mm headphone |
| Tone Controls | Bass and treble |
Audio
| Feature | Specification |
|---|---|
| Vacuum Tubes | Replaceable 6K4 pair |
| Frequency Response | 20Hz–20kHz (±1.5dB) |
| THD | ≤0.04% |
| SNR | ≥99dB |
Recommended System Setup
| Setup | Connection |
|---|---|
| Wireless stereo | Phone → Bluetooth → T20 → passive speakers |
| Wired stereo | Streamer/DAC → RCA → T20 → passive speakers |
| Headphones | Source → T20 → 3.5mm headphones |
Additional Product Content
| Feature | T20 | T20X | P3 |
|---|---|---|---|
| Product Position | 50W x2 tube integrated amp | 100W x2 tube integrated amp | Tube preamp / headphone amp |
| Passive Speaker Amplifier | Yes | Yes | No |
| Inputs | Bluetooth 5.0, RCA | Bluetooth, AUX | Bluetooth, RCA |
| Speaker Output | 50W x2 max at 4Ω | 100W x2 max at 4Ω | None |
| Headphone Output | 3.5mm | 3.5mm | 3.5mm |
| Tone Controls | Bass, treble | Bass, treble | Bass, treble |
| Tube Rolling | Compatible tubes | Compatible tubes | Compatible tubes |
| Best Use | Compact speaker/headphone system | Higher-power speaker system | Add tube preamp/headphone stage |
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