This may be a dum question but why would you need bluetooth ? My active speakers have Bluetooth!

Simply because my passive speakers don't.

Can these tube preamps be connected to power amplifiers , phono and headphone mini tube preamps ?

Hi Hollis, you ask about Box X3. My Fosi is a Box X2 bought in 2021. Let me tell you about my product. My INPUTS : MOVING MAGNET turntable (phono) 3.5 mm AUXILIARY (headphone) 12VDC My OUTPUT : RCA interphase to AMPLIFIER or ACTIVE SPEAKERS Being more modern X3 should have same configuration plus extras, e.g. bluetooth. To answer your question : yes, you should be able to connect your X3 to power amps (or preamps), phono stages and headphone preamps. My advise to you is to download the user manual from the FOSI AUDIO site and recheck. Good luck.

Fosi, be the first to produce a mini tube preamp that includes phono, bt and aux inputs plus a remote control. why not ?

It didn't work at all; no sound came out except a hum.

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🎶 Elevate your vinyl game with vintage warmth and wireless freedom!

PLUG PLAY VERSATILITY - Supports MM turntables and 3.5mm line-in for effortless connection to any home audio setup.
COMPACT POWERHOUSE DESIGN - Sleek, lightweight form factor fits perfectly in any modern audio space without clutter.
TRUE TO RECORD SOUND FIDELITY - RIAA-standard phono circuitry ensures every note from your vinyl is flawlessly reproduced.
SEAMLESS BLUETOOTH 5 0 INTEGRATION - Stream your favorite vinyl vibes wirelessly with crystal-clear Hi-Fi quality.
VINTAGE TUBE WARMTH MEETS MODERN PRECISION - Experience ultra-low noise and rich, warm sound from authentic 5725W vacuum tubes.

The Fosi Audio BOX X3 is a compact, high-performance phono preamplifier combining classic 5725W vacuum tube technology with Bluetooth 5.0 wireless streaming. Designed for MM turntables, it delivers 18 watts of clean, warm sound with ultra-low noise and precise RIAA-standard signal processing. Perfect for audiophiles seeking to blend vintage analog warmth with modern wireless convenience in their home audio systems.

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Brand	Fosi Audio
Manufacturer	Fosi Audio
Model	BOX X3
Model Name	Fosi Audio BOX X3
Product Dimensions	10.16 x 7.62 x 2.54 cm; 226.8 g
Item model number	BOX X3
Mounting Hardware	Quick Start Guide
Number of items	1
Audio Wattage	18 Watts
Voltage	220 Volts
Power Source	AC 110V - 240V
Batteries Included	No
Batteries Required	No
Signal-to-noise ratio (dB)	98 tablespoon(s)
Connector Type	Aux, Bluetooth
Includes Rechargeable Battery	No
Includes remote	No
Manufacturer	Fosi Audio
Item Weight	227 g

Fosi Audio Box X3 5654W Tube Phono Preamp Turntable Preamplifier for MM Phonograph Bluetooth 5.0 Mini Stereo Hi-Fi Pre-Amplifier for Home Audio Record Player Sound System

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