Fosi Audio Box X2 Phono Preamp, Mini Stereo Audio Hi-Fi Preamplifier with Gain Gear, Pre-Amplifier for MM Turntable Phonograph and Record Player, with DC 12V Power Supply

Fosi Audio Box X2 Phono Preamp, Mini Stereo Audio Hi-Fi Preamplifier with Gain Gear, Pre-Amplifier for MM Turntable Phonograph and Record Player, with DC 12V Power Supply

$69.99

Item dimensions L x W x H	4.66 x 3.85 x 1.29 inches
Voltage	12 Volts (DC)
Manufacturer	Fosi Audio
Maximum Supply Voltage	12 Volts (DC)
Minimum Supply Voltage	12 Volts (DC)
Mounting Type	Freestanding
Brand	Fosi Audio
Number of Channels	1
Output Power	12 Volts
Package Type Name	box
Specification Met	Standard Riaa, Ce
Product Dimensions	4.66 x 3.85 x 1.29 inches
Item Weight	10.9 ounces
ASIN	B07XNTHHBP
Item model number	BoxX2
Date First Available	September 9, 2019
Language	English

Add to wishlist

Category: Electronics

Description

Price: $69.99

(as of Feb 18, 2026 02:50:50 UTC –

Details
)

Product description

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Fosi Audio Box X2 Phono Preamp Merchant Video

phono preamp for turntable

Tube MM Phono Preamplifier/Tube Preamp

With RCA and 3.5mm AUX inputs, the BOX X2 offers flexibility to connect with various audio sources, making it a versatile addition to different systems.

Power Adapter: 12V/1.5A; Adapter Input Voltage Range: AC 110V – 240VOutput Voltage Level: 600 Mv @3mV 1kHzFrequency Response: Standard RIAA; SNR ≥ 98dB; THD ≤ 0.1%Output Impedance: 280Ω; Size: 4.66 x 3.85 x 1.29 inches; Weight: 10.9 ounces.

phono preamp for turntable Clear Sound with Low Noise Circuitry

Enjoy clear and detailed sound with advanced low-noise design, delivering an authentic experience.

turntable preamp 4-Level Gain Adjustment for Any Setup

Adjust sound with 4 gain settings for precise customization on any amplifier or speaker setup.

turntable preamp Minimalist Design for Any Space

The BOX X2’s sleek and compact form easily fits into any audio setup, offering style and function.

pre amp for record player Replaceable Vacuum Tubes for Unique Tones

Achieve warm, vintage sound or modern, clear tones by replacing vacuum tubes for personalized audio.

1 Superior Audio Quality

2 Adjustable Gain Control

3 Sleek and Compact

4 Customizable Sound

phono amplifier for turntable Perfect Addition to Your Vinyl Setup

Turn your home into a sound haven with BOX X2, enhancing the sound of your vinyl collection.

phono amplifier for turntable Compatible with most MM phono turntables

Easily connects to MM phono turntables, offering a variety of choices for vinyl equipment.

turntable tube preamp 3.5mm AUX Input for Easy Connections

Easily connect your phone, tablet, or other devices via the 3.5mm AUX input for more audio options.

phono amplifier for turntable Enhance Focus with Clear, Crisp Sound

Enjoy better audio quality in your workspace, helping you focus on tasks or relax with music.

1 Home Audio Upgrade

2 For Turntables

3 Desktop Audio Setup

4 Work in Harmony

Product Advantages tube phono preamp for turntable RCA for MM Turntable Preamp

Ideal for MM cartridges, this mini preamp features precise RIAA equalization and low noise. It includes stereo RCA inputs and outputs.

tube phono preamp for turntable AUX for Tube Preamplifier

Audiophile-grade amplification with low-noise operational preamps, plus a tube preamp and 3.5mm AUX input. Crafted from high-quality components.

pre amp for turntable Elegant Vacuum Tube Design

The visible vacuum tubes give a retro aesthetic while offering enhanced sound quality.

pre amp for turntable Circuit Board Layout

The circuitry is meticulously arranged to minimize interference and maximize sound quality.

My turntable has a built-in phono preamp. How do I connect it to the BOX X2?

• If the turntable has a built-in phono preamp, switch it to “Line Out” mode and connect it to the 3.5mm input on the BOX X2.

• If the turntable is set to “Phono” mode, connect it to the MM input on the BOX X2 for optimal sound.

Does the BOX X2 have any built-in tone control? Dose the BOX X2 have bluetooth?

No. The BOX X2 don’t have bluetooth. And the BOX X2 features gain control, not tone control. For enhanced tonal shaping, consider using models like BOX X4, which includes treble and bass adjustments. For bluetooth consider using models like BOX X3.

How to connect a turntable to the BOX X2 and active speakers?

Make sure the turntable has a Phono output with an MM cartridge. Some turntables have a built-in phono preamplifier, set it to Phono switch.

Can I replace the tubes in the BOX X2?

You can substitute with 7-pin tubes such as 6AK5, 6AK5W, 6Zh1P, 6J1, and 6J1P. These can also directly replace WE-403A, WE-403B, EF95, 6A2 tubes, 5725w tubes and standard 5654 tubes.

Turntable has built-in preamp/line switch—Can I still use this instead of my built-in preamp?

Yes, deselect the preamp on your turntable.

Note: Please confirm whether your turntable has a built-in phono preamp, if there is a phono preamp, and it cannot be deselected, then you can only connect 3.5 mm input, can not connect MM Turntable input.

Friendly Solutions Guide for BOX X2 Phono Preamp

I. Compatibility Limitations

1. Compatibility: The BOX X2 Output Impedance: 280Ω. Power adapter: 12V/1.5A; adapter input voltage range: AC 110V – 240V. Please use a matched power adapter and an amplifier with matched impedance to avoid incompatibility.(Does not support MC turntable)

2. Connections: The BOX X2 with RCA and 3.5mm AUX inputs. Please make sure that your turntable is MM output and also make sure that it is phono output, this situation the MM turntable can only insert RCA input. If the turntables built-in phono preamplifier, so it should connect the 3.5mm AUX input on the BOX X2 not the RCA phono input. The other device(e.g. Laptop, PC, Phone, Tablet, TV, DVD, etc.) can only insert 3.5mm AUX input. Not support Bluetooth, can connect to a pair of active speakers, but need to add an amplifier or receiver to the passive speakers.

3. For details on how to use the BOX X2 with a record player that has a built-in phono amplifier. If the turntable has a built-in phono preamp, switch it to “Line Out” mode and connect it to the 3.5mm input on the BOX X2. If the turntable is set to “Phono” mode, connect it to the MM input on the BOX X2 for optimal sound.

Note: The 3.5mm port on the front of the BOX X2 is an AUX input port and cannot be used to connect headphones.

II. Function & Sound Quality- Related Solutions

1. Cable Issues: Ensure all plugs (e.g., 3.5mm AUX Input, MM Turntable input, RCA output) are fully inserted and match the device specifications. Reseat any loose connections. Ensure all cables are correctly connected, secure, and in good condition.

2. Tube Installation: Make sure the tube pins are properly lined up with the tube socket; Please manually straighten the pins if the pin is deformed.

3. Gain Setting: 4-levels of output level setting (OFF/39/42/45 dB). Offers gain adjustment, allowing you to control the amplification level of the input signal, rather than directly controlling the volume level. The higher the gain is set, the greater the likelihood of distortion. It is recommended to prioritize adjusting the volume control knob on the speaker.

Please know that when no inputs connected to BOX X2, the default input way is MM input mode, in this mode, the gain of the amplify is much large then other input modes, so it’s normal that will have some humming sound when no sound pass through.

Tube MM Phono Preamplifier: This Fosi Audio phono preamplifier removes low-frequency noise and ensures clear sound quality by converting phono signals to line-level signals using high-quality components and low-noise integrated circuits. It is designed to safeguard your turntable thanks to its grounding post
3 Switchable Gain Modes: You can switch between 3 modes: 39, 42, or 45 dB. High compatibility and customizable control are provided by the adjustable gain levels. Also, it has very good circuitry and entry-level, high-end analog sound
Tube Preamplifier: With a 3.5mm AUX input, it’s also a tube preamp. Fosi Audio used high-quality component parts for the design and assemblage of this phono preamplifier. You can enjoy a very warm and smooth sound
Applicable Vacuum Tube Model: The compatible vacuum tube models are 6K4, 6J1, 6J4, GE5654, 6AK5, 66, etc. To make changes to your stereo system yourself, simply swap out the vacuum tubes. Consider that distinct tubes produce various sounds
Package Content: You will get 1 x Box X2 phono preamp, 2 x vacuum tubes, 1 x RCA cable, 1 x power adaptor, and 1 x user manual

Reviews (11)

11 reviews for Fosi Audio Box X2 Phono Preamp, Mini Stereo Audio Hi-Fi Preamplifier with Gain Gear, Pre-Amplifier for MM Turntable Phonograph and Record Player, with DC 12V Power Supply

Mr James Farrant

February 18, 2026

not as attractive as some of Fosi's other products but works very well ... - i use mine with my SL1210 turntable and it does the job of a preamp perfectly well

mikael appel

February 18, 2026

Snabb leverans och bra pris

peter

February 18, 2026

This Preamplifier is amazingly good for the price and compares favourably when compared to my €1,500 Preamplifier. Appears too good to be true for the price, but it delivers clean smooth musical sound with zero gain noise.

Alexandre

February 18, 2026

Dei mais pontecia na minha agulha!top

Kiko Willers

February 18, 2026

I have never written a review on Amazon, or anywhere else that I can remember. But his product seems special.I read the reviews and thought “no way, this can’t be that good”. But I was also looking at a so-called affordable audiophile preamp that cost literally 10 times as much as the Fosi, so it couldn’t hurt to try the little guy. I’m so glad I did.Straight out of the box it put the in-built preamp on my Klipsch The Sixes to shame, it opened up the speakers in a very nice way. And this is before any tube burn in and literally from a cold start.The sound is balanced and inviting. Absolutely perfect for pleasurable listening, I can’t find any harsh edges anywhere. For the price, I was expecting a much muddier sound, but the clarity is surprising. I like clarity, especially on vocals, so this is a plus for me. I’m writing this at the end of a 3-hour listening session, that’s gotta count for something.This little preamp is so good that it made me specifically search for other Fosi gear, I’m about to purchase one of their DACs to test out.You see, products like these bring me hope in the world of Hifi, where every little magic box seems to cost a years’ salary. Good to know one can actually find decent quality at prices that encourage people to experiment, rather than buying something and having to force oneself to like it because the financial commitment is so large.I’ll definitely be keeping an eye out on this brand. We’ll done Fosi!

Krzysztof Czarnecki

February 18, 2026

Great value for money, this isn't a "Little Bear" It's not one of those cheap Chinese preamps from AliExpress, though it may bear some superficial resemblance. It has actually good components with good layout inside. It has very good sound and very little noise and hum (not audible at all when the volume is set so that the surface noise of a clean, nee record is audible loudly). Much better than the built-in preamp of Pioneer PLX-500, and similar Hanpin products. It's not 100% flat, but in a good way and subtly, it makes the music sound better. The details are much clearer and the soundstage is way better than with the built-in preamp. I grounded mine to the ground pin (not the L or N pins!) of the wall outlet because my turntable does not have a ground connector, and grounding the preamp to the chassis of the amplifier or to the shell of the USB port on the turntable made the hum worse. This is the configuration that has no audible hum for me. But it's whatever works best in your case - it may be amp chassis, it may be the TT ground, or it may be no extra ground.The blue LEDs under the tubes - why they always do it, I have no idea. But at least in this case it is actually dimmer than the tube glow and looks pretty good - it comes out a lot brighter on the camera than in real life.The power cord is a bit short (about 1m, maybe less), so that could require an extension cord or a power strip.

Marc M.

February 18, 2026

Fantastic Upgrade! This sounds great! I decided to upgrade from the Rolls pre-amp I was using and what a difference! I paired it with my Audio-Technica AT-LP120XUSB and switched out my stylus from AT-VM95C to a AT-VM95E and I’m amazed how much better it sounds. The high end and mid-range are detailed and the lows are punchy but without being harsh. Nice and warm, like a hug from Grandma. I’m currently using it the 42db setting and it’s sitting very balanced with my set up. Seams kind of hard to beat for $70 but I’m still new to the audio file game but sounds great to my ears. If you’re on the fence about getting it, just do it.

Martha Bennett

February 18, 2026

Does the job! Solid preamp that has enhanced my listening experience

Kumo-Sensei

February 18, 2026

Great to pair with vintage turntables Unit works incredibly well as a partner to my late 80s Sony PS-LX520. Easy to set up and adjust the gain with the selectable knob. It does color the sound a bit more than the pre-amp built into my stereo receiver, but it also sounds fuller than the built-in ever did so I can accept that compromise. The tubes do get a little warm, and hot to the touch, but it's still within operational range specs for them so I don't think that's an issue so much as a 'don't leave within reach of small children' kind of note. If you're looking for a reasonably priced phono pre-amp that gives you the benefits of tube amplification, this is a great choice.

Thomas R.

February 18, 2026

Great Value in a Pre-amp Very impressive pre-amp that worked right out of the box, but not without a scarey moment or two. A pre-amp was necessitated as my Audio-Technica table does not have one and my Pioneer SX-10AE receiver lacks a Phono Input, only two Line inputs.To eliminate the 'scarey moments' ensure the selector switch on back of the turntable is in the Phono position after adding the pre-amp or horrible distortion will be the result. And, I believe, the vacuum tubes need to be "broken-in" by running for a short while under load. My 1st LP sounded horrible. I considered returning it or the pre-amp! But, the 2nd and 3rd LPs sounded great. I put the 1st LP back on and it too became great. This demonstrated to me that the new tubes needed a little exercise to perform correctly.Many people describe the sound from from tube type pre-amps as being warm and with other positive descriptions. I'm not sophisticated enough to know what they mean. All I can say is that the sound out of my system is absolutely wonderful. The volume control is a step-switchI woukd have prefered a smooth control without the steps, but this is effective too.I highly recommend the Fosi pre-amp. It's available at a small cost for big, pleasing sound.

Netmon

February 18, 2026

Moving Coil vs Moving Magnet cartridges Let's jump right to the most glaring bit of misinformation floating around the reviews here. Several reviewers here are stating this pre-amp is for moving magnet type phono cartridges only. NOW I can't speak for ALL "moving coil" carts, but my, Denon DL 103, moving coil, has no apparent (audible) issues with this amp. None. Sounds perfect. I've been transferring my Vinyl to bits and my disk recorder (records like a tape deck but to a CD) was getting really low levels. I could correct this after the fact with SW with no quality issues, but it was awkward. This amp was just the boost I needed. (no gain control on the recorder) SO the selectable output level switch is nice. I'm ok at the lowest, better at the middle, and just a showing a flicker of red on the highest. This was first time I'd ever seen level-leds show any red. Bottom line, Great little amp for the $. Works with any modern, quality cartridge/turntable.You'll notice the instructions don't say jack about "only moving magnet", but the input is labeled "MM". perhaps that's where the confusion sprang from. Fosi may have done that simply because moving magnet are typically less expensive and hence are likely to be what most people will have. The other thing the instructions don't say what input on your main amp/receiver to plug the output from the fosi into. It's just says "connect to your amp" for the record it's Line In or Aux, NOT phono. I plugged mine direct into the line in on my recorder and returned to the amp from the recorder.Lastly Packing. Several guys groused loudly about packing. Mine too was shipped in plain thin, bubble wrap-type bag. But that's fine the way the tubes are packed inside the Fosi box, you could drop the box from 5 feet(ish) over and over and not damage anything but the outside of the box.Final tip. Installing the tubes. They go in pretty tight. So once your sure you're lined up correctly don't be afraid to lean into it a bit.UPDATE MM V MC cartridge compatibility. To be clear, at first listen, THIS particular amp, SEEMS to be fine with at least one particular MC cartg, my Denon DL-103 MC-type cart. No distortion, no hum. Output level perfect, (best on the middle gain setting of 3). But after applying a more critical "ear" I'm not convinced I'm getting all of the clarity and or fullness this legendary DL-103 is famous for. NOW there are a couple possible explanations for this that don't involve this "amp v MC cartridge compatibility" issue. Age of the cartridge being first. While it's well under the life-span limit in hours played, it IS 10 years old. Also, I have never checked, let alone adjusted, the turntable vs tone-arm for level, so there's every reason to assume this (aka "VTA") setting is not optimum. I was shocked to learn how big a SOUND difference this, the angle of the stylus to the groove (VTA) can make. (follow up on that to come) What I can say for now is that the combination of this MC cart and this amp 'sounds' correct, if not "super'. and after playing it last night for about 6 or 7 hours it doesn't appear that either the amp nor the cart is being damaged by the other. If you're wondering if your MC cart will be similarly content with this amp, be advised the "Recommended Load Resistance" on my Denon DL-103 is "100 ohm or more, (except when a transformer is provided)" I believe transformer is what some MC type carts refer to a pre-amp as. The manual for the Fosi X2 doesn't give any ohm rating, load/capacitance, resistance rating number of any kind, input or output. Bottom line this could be a viable "budget option" amp for at least some, MC type carts. Since "proper" MC pre-amp/transformers, start about double what this one costs and run as much as 4 or 5 times more expensive.

Add a review

Shipping and Delivery

MAECENAS IACULIS

Vestibulum curae torquent diam diam commodo parturient penatibus nunc dui adipiscing convallis bulum parturient suspendisse parturient a.Parturient in parturient scelerisque nibh lectus quam a natoque adipiscing a vestibulum hendrerit et pharetra fames nunc natoque dui.

ADIPISCING CONVALLIS BULUM

Vestibulum penatibus nunc dui adipiscing convallis bulum parturient suspendisse.
Abitur parturient praesent lectus quam a natoque adipiscing a vestibulum hendre.
Diam parturient dictumst parturient scelerisque nibh lectus.

Scelerisque adipiscing bibendum sem vestibulum et in a a a purus lectus faucibus lobortis tincidunt purus lectus nisl class eros.Condimentum a et ullamcorper dictumst mus et tristique elementum nam inceptos hac parturient scelerisque vestibulum amet elit ut volutpat.