Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier With Vacuum Tube Amplifier HiFi BOX X4

Notice:

1.The BOX X4 is currently equipped with 6J1 vacuum tube.
2.BOX X4 is only a preamplifier, not amplifier, can not be connected with passive speakers directly, If you need connect BOX X3 with passive speakers, you need to connect it with an amplifier then connect the amplifier with your passive speakers.

Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier With Vacuum Tube Amplifier HiFi BOX X4

Features:

1.6J1 Tube MM Phono Preamplifier: The BOX X4 phono preamp supports 3.5MM AUX and MM turntable input, converting phono signals to Line Level with low-frequency noise removal using high-quality components and low-noise integrated circuits. Protect your turntable with the grounding post feature

2.Tube Headphone Amplifier & Preamplifier: The Fosi Audio BOX X4's versatile design includes a 3.5MM AUX headphone and RCA output, offering a range of usability beyond expectations

3.Applicable Vacuum Tube Model: 6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc. Achieve a customized stereo system by replacing vacuum tubes. With different tubes producing unique sounds, it's a DIY opportunity worth exploring

Highlight:

Model: BOX X4

Power Adapter Output: 12V

Product Adapter Input Voltage Range: AC 100V - 240V

Output Voltage Level: 1kHz and 650mV

SNR ≥ 70dB

THD ≤ 0.1%

Frequency Response: Standard RIAA

Product Weight: 0.71 lb/320g

Product Dimensions: 3.97x4.72x1.37 inch (10.09*12*3.5 cm)

Input Mode: MM turntable input +3.5mm AUX

Output Mode: RCA output + 3.5mm headphone output

Applicable headphone types: 16 Ω - 300 Ω

Package Include:

*Box X4 Phono Preamp x1

6J1 Vacuum Tubes x2

*12V Power Adaptor x1

*User Manual x1

QA

Q1:Can the headphone and RCA outputs be used simultaneously?

Yes. When both the 3.5mm headphone output and RCA output are connected, sound will be output
through both the headphones and RCA connectors.

Q2:Can the BOX X4 be used with an MC cartridge?

NO.The BOX X4 is designed specifically for use with MM cartridges. However, our upcoming model, the BOX X5 is compatible with MC cartridges.