Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4

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

Regular price
$89.99 USD
Sale price
$89.99 USD
Regular price
$89.99 USD
Tax included. Shipping calculated at checkout.
Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp Fosi Audio Box X4



Specifications

Specifications Details
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


What‘s in the box?

Item Quantity
BOX X4 phono preamp x 1
Vacuum Tubes x 2
DC 12V power supply x 1
User's Manual x 1
Download BOX X4 User Manual

Customer Reviews

Based on 3 reviews
67%
(2)
33%
(1)
0%
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0%
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M
Mark Freedman
Warm sound but headphone preamp design could be better

This turntable (and “headphone”) preamp works very well for both of my vintage turntables (Sony PS-LX3 and Dual CS-616Q), producing clean and relatively warm sound. The bass and treble controls support fine tuning but I mostly leave them at the positions recommended by Fosi. Note that there is no center position detent. My only complaint is that it isn’t really a fully functional headphone preamp. It provides plenty of power for my Sennheiser cans but works directly only with the turntable as the audio input. If I want to listen with earphones for any other source I need to connect my Fosi ST20A PRO’s pre-out to the preamp line-in. That works okay but is needlessly kludgy.

P
Peter Culverwell
A perfect fit with an audio-tecnica AT LT60x turntable and a Sonos Five.

After using this little valve pre-amp for a year now I am very impressed by its sound, build quality, and value. The device provides a wonderful warm analog valve sound that is distinctive when compared to the switchable built-in preamp of the Audio-Technica AT LT60x turntable. When plugged directly into the 3.5 in jack of a Sonos Five it creates the perfect budget analog audio setup with digital expansion capability for the future. The usefulness of physical volume and tone controls is a feature I use every day. Sometimes lo-tech is a good thing! Highly recommended.

D
David Lender
Fosi Audio Box X4

Unfortunately I sent the the Fosi Audio Box X4 back as a return because I ordered it in error I wanted the new Fosi P3 pre amp,so, I ordered it. Since then I have received the P 3 and have it integrated into the system I have designed. Currently it is not doing very well but ,I am aware of changes/adjustments required to improve the system overall. Don't misunderstand me. I am pleased with my purchase. Adjustments need to be made.

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