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Suncoast Audio Direct

Fosi Audio Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier

$79.99
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Description
  The Fosi Audio Box X4 combines dedicated phono preamplification with integrated headphone amplification in a single compact unit. Purpose-built MM cartridge input with low-noise signal conversion and grounding protection ensures pristine vinyl playback, while auxiliary inputs accommodate digital sources. Tube-based architecture supports multiple vacuum tube variants—5654W, 6K4, 6J1, 6J4, GE5654, 6AK5, and others—allowing personalized sonic tuning through component swapping. Dual output configuration enables simultaneous line-level and headphone monitoring. Package includes 12V power supply, documentation, and 18-month warranty with dedicated customer support.  

Technical Specifications

Model BOX X4
Applicable headphone types 16 Ω - 300 Ω
Input Mode MM turntable + 3.5mm AUX
Output Mode RCA + 3.5mm headphone output
Output Active(powered) speakers, Amplifier, Headphones
Frequency Response Standard RIAA
THD ≤ 0.1%
SNR ≥ 70dB
Device Dimension 4.72 x 3.97 x 1.37 inches
DC Input Range 12V
Input Voltage Range AC 110V - 240V
Output Voltage Level 1kHz and 650mV
Power Supply 12V 1.5A

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Suncoast Audio Direct

Fosi Audio Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier

$79.99

 

The Fosi Audio Box X4 combines dedicated phono preamplification with integrated headphone amplification in a single compact unit. Purpose-built MM cartridge input with low-noise signal conversion and grounding protection ensures pristine vinyl playback, while auxiliary inputs accommodate digital sources. Tube-based architecture supports multiple vacuum tube variants—5654W, 6K4, 6J1, 6J4, GE5654, 6AK5, and others—allowing personalized sonic tuning through component swapping. Dual output configuration enables simultaneous line-level and headphone monitoring. Package includes 12V power supply, documentation, and 18-month warranty with dedicated customer support.

 

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