Fosi Audio P3
- Fosi Audio
Fosi Audio P3
- Fosi Audio
$79.90
- 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 P3 is a compact tube preamplifier and headphone amplifier with RCA and Bluetooth 5.1 source inputs.
Replaceable 5654W tubes, aptX-family Bluetooth codecs, bass and treble controls and outputs for headphones, amplifiers and powered speakers make it a versatile analog control stage.
Why it stands out
Tube preamplifier character
A true tube stage adds adjustable tube character between line-level sources and the rest of the audio system.
Wireless and wired inputs
Bluetooth 5.1 with Qualcomm QCC3031 and RCA input support convenient source switching.
Headphone and system outputs
A 3.5mm headphone jack, RCA output and AUX output support personal listening and downstream components.
Hands-on tone control
Front bass and treble controls help adapt sound to headphones, speakers and room conditions.
Best for
- Adding Bluetooth and tube character to a power amplifier
- Desktop wired headphone listening
- Active speaker systems needing volume and tone control
- Users interested in replaceable tube tuning
Not ideal for
- Driving passive speakers directly
- Turntables without a phono preamp
- Systems requiring USB, optical or coaxial digital inputs
EMiUZEK Buying Notes
- P3 is a preamplifier/headphone amplifier, not a speaker power amplifier.
- Its RCA input is line level; a standard turntable needs a phono preamp.
- RCA and AUX are downstream outputs, while the front 3.5mm jack is for headphones.
Frequently asked questions
Can P3 drive passive speakers?
No. Connect it to a separate power amplifier or powered speakers.
Can I use wired headphones?
Yes. It supports 16–300Ω headphones through the front 3.5mm output.
Does it accept digital inputs?
Bluetooth is supported, but there is no USB, optical or coaxial input.
Can I connect a turntable?
Only through a built-in or external phono preamp before the RCA input.
Can I connect an active subwoofer?
The AUX or RCA line output can feed compatible downstream equipment; confirm the subwoofer's input and system gain arrangement.
Are the tubes replaceable?
Yes. The supplied 5654W tubes are replaceable with compatible tube types.
HOW TO CONNECT
Power amplifier system
Source: Streamer, DAC or Bluetooth device
Connection: RCA or Bluetooth
Output: RCA output
Target: Power amplifier → passive speakers
Note: P3 controls source level; the power amplifier drives the speakers.
Powered speaker system
Source: Phone, streamer or DAC
Connection: Bluetooth or RCA
Output: RCA or AUX output
Target: Powered speakers
Note: Begin with low volume on both devices.
Headphone setup
Source: Phone, streamer or DAC
Connection: Bluetooth or RCA
Output: 3.5mm headphone output
Target: 16–300Ω wired headphones
Note: Use the front volume and tone controls.
Technical Specifications
Audio performance
| Feature | Specification |
|---|---|
| Product type | Tube preamplifier / headphone amplifier |
| Headphone impedance | 16–300Ω |
| Headphone output | 250mW at 16Ω; 150mW at 32Ω; 32mW at 250Ω; 20mW at 300Ω |
| Frequency response | 20Hz–20kHz (±1dB) |
| SNR | ≥103dB |
| THD | ≤0.02% |
| Dynamic range | 104dB |
| Crosstalk | 95dB |
Connectivity and power
| Feature | Specification |
|---|---|
| Inputs | Bluetooth 5.1, RCA |
| Outputs | RCA, AUX, 3.5mm headphone |
| Bluetooth chip | Qualcomm QCC3031 |
| Bluetooth codecs | SBC, AAC, aptX, aptX HD, aptX LL |
| Bluetooth range | ≥10m |
| Power input | DC 12V / 1.5A–3A |
Recommended System Setup
| Setup | Connection |
|---|---|
| Stereo preamp | Source → P3 → Power amplifier → Passive speakers |
| Active speakers | Source → P3 → Powered speakers |
| Headphones | Source → P3 → Wired headphones |
Additional Product Content
Fosi Audio product comparison
Compare Fosi Audio compact preamplifier and tube DAC options by the capabilities that determine how they fit into a system.
| Feature | P3 | P4 | GR40 |
|---|---|---|---|
| Product position | Tube preamp + headphone amp | Solid-state analog preamp | Tube DAC + headphone amp |
| Analog inputs | RCA | RCA × 3 | None |
| Digital / wireless inputs | Bluetooth 5.1 | None | Bluetooth, USB, optical, coaxial |
| Main outputs | RCA, AUX | RCA, pre-out | RCA |
| Headphone output | 3.5mm | No | 3.5mm |
| Speaker amplification | No | No | No |
| Tube stage | Yes, replaceable 5654W | No | Yes |
| Tone controls | Bass and treble | Bass and treble with bypass | Bass and treble |
| Remote control | No | Yes | No |
| SNR | ≥103dB | ≥110dB | ≥103dB |
| Best use | Bluetooth tube preamp and headphones | Multiple analog source control | Digital sources with tube conversion |
What's in the box, manuals and downloads
Shipping, warranty and returns
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Please contact EMIUZEK before returning any product so we can provide assistance.