Fosi Audio Box X2 MM Turntable Phono Preamplifier
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Fosi Audio Box X2 MM Turntable Phono Preamplifier
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
We offer free worldwide shipping, except for certain regions such as Ukraine and Russia, where our services are currently unavailable.
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Customer Support
WhatsApp: +8613716612254
support@fosiaudio.com
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FAQ’s
If you have any questions, please refer here: FAQs
Product details
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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
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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
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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
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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
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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
Specifications
| Specifications | Details |
|---|---|
| Model | BOX X2 |
| Input Mode | RCA+3.5mm AUX |
| Output Mode | Active Speakers |
| Frequency Response | Standard RIAA |
| THD | ≤ 0.1% |
| SNR | ≥ 98dB |
| Product Weight | 0.66 lb/300g |
| Device Dimension | 4.66 inch/3.85 inch/1.29 inch |
| DC Input Range | 12V |
| Input Voltage Range | AC 110V - 240V |
| Output Voltage Level | 600 Mv @3mV 1kHz |
| Power Supply | 12V 1.5A |
What‘s in the box？
| Item | Quantity |
|---|---|
| Box X2 Phono Preamp | x 1 |
| Vacuum Tubes | x 2 |
| 12V 1.5A Power Adapter | x 1 |
| RCA Cable | x 1 |
| User’s Manual | x 1 |
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FAQs
Please read our FAQs page to find out more.
How to: Choose the right banana plug?
- Closed Screw Type. All Fosi amplifiers use standard-sized speaker terminals (4mm pins).
- Easy to wire up and solidly connect to amplifier and passive speaker.
- If they do not fit, use a little force to tighten the plugs.
- Fosi Audio Banana Plugs (Copper, Silver/Gold Plated): http://bit.ly/40Djq0U, https://bit.ly/3MkPL8t
- Please watch tutorial videos: https://youtu.be/6pYhoqDlvNw / https://youtu.be/RGvBgGAwS9k
How to Diagnose Power Supply Failure?
- The following situations may cause this issue
- Case 1: The LED on the power supply does not light up; Case 2: Amp/Preamp does not turn on; Case 3: When plugged into the Amp, both light on the amp & power supply start blinking; Case 4: Amp/Preamp make noise; Case 5: Sound shuts off by itself
- Possible solution
- Check if the power supply is illuminated when plugged into AC by itself.
Plug power supply into a different socket.
Test the adapter with a meter.
Try a different power supply (within a range of DC input).
Test the included power supply on other electrical equipment.
Please watch the tutorial video by clicking on the link provided. https://youtu.be/yCjygS03zTE
What are the differences in power outputs using the 32V and 48V power supplies?
- Using a more powerful power supply can help prevent distortion.
- Enables amplifier to drive larger, more powerful, or higher-impedance speakers.
What is a GaN?
- The GaN supply has a power output of 240W.
- Offers overload and over-temperature protection.
- The 48V 5A GaN power supply is also available on Amazon.
This turntable phono preamplifier delivers exceptional sound quality at an outstanding price point. Customers praised it as "the difference before and after is like day and night" with "warm, rich sound" and improved volume. The device effectively eliminates hum noise and works seamlessly with vintage turntables. However, concerns about customer service responsiveness were noted.
I get a new enthusiast mid price turntable, Crosley C6B, to be honest is like an Pro-Ject debut little brother, and connect to my Harman Kardon 3390 amp, low volume response and some hum noise connected to phono stage so I decided to give a chance to this FOSI pre, well, the difference before and after is like day and night, even in the lowest output I can get a much richer sound and decent volume from my amp, on the old days I never feel the urgency to get a preamp until now. The best $60 dollars I spent in audio in last year.
It really transform the sound of your vinyl, its warmer with more stage presence.
There are but a few things that are able to put a permanent grin on my face, here’s one of them. So far, every Fosi product I bought exceeded my expectations, this time is no exception. The Fosi tube phono pre amplifier really gives my sl-2000 that extra sweetness that takes me back a “couple” of decades. You guys are like lego’s for big kids!
The quality is top and even thou I was sceptic it significantly improved my sound experience. Love the design. The blue glow light looks really cool, like Cherenkov radiation in a reactor.
Just got the Audio Box X2 Phono preamp hooked to my 40-year-old B&O 1800 turntable and am blown away by how great it sounds. Simply awesome.
Today I received my Fosi Box X2 and you've given me a new stereo system. I have a vintage Pioneer turntable from the 70's and a Pioneer receiver from the 90's and the Box X2 has delivered on what I had hoped for. In particular, I was looking for an improved low end and that wish has come true. I'm hearing sounds on my records that I hadn't heard before and it's really quite something when you consider the return on investment. I've just ordered a set of the upgraded tubes so I can experiment. Thank you Fosi Audio!
We had no experience with building your System and we ordered too many Parts. You provided no Tech Support, no correspondence from several emails and no phone number to call. We would like to build another System but now wonder about future Support. Seems to be very good quality products
Came in perfect condition and arrived WAY faster than i thought it would. works like a charm.
recommended for good music
I definitely kicks butt. I'm still fine tuning it with the speaker system I got to have it punch better with my phonograph sitting through just A speakers and not A and B. Still fine tuning it and I am not sure about the outcome yet if there's an update I will change this. I got it to stop the humming that was coming from phonograph. It definitely stop the humming but I'm also having reduced punch. I am working on that. Anything changes I will update.
Fantastic pre-amp for vintage turntables! Boosts the signal just right and offers great sound! Highly recommended!
Fosi Audio Box X2 MM Turntable Phono Preamplifier
The box works exactly as described. Easy to hook up and I fed the output of the Fosi box to another converter box that converts the analog signal to HDMI and fed it to my soundbar. Now I can listen to my vinyl albums (without a big clunky amplifier) turntable to soundbar. Very happy with the box and the blue tubes look cool too.
Fosi Audio Box X2 MM Turntable Phono Preamplifier
What can you buy for $70 in electronics that's so satisfying? I was not expecting much, but was very pleasantly surprised. Aside from detail retrieval, the unit is punchy with good dynamics, very musical across the entire spectrum. Much of its performance will also rely on your choice of cartridge combined with the Fosi. I love it i think you will too for the asking price.
It fits my music system perfectly. I might try it with other vacuum tubes as well. I'm glad I ordered it.
A rich analogue sound that can only be achieved with vinyl. For a budget phono this is very impressive.
Fosi Audio Box X2 MM Turntable Phono Preamplifier
Fosi Audio Box X2 MM Turntable Phono Preamplifier
Great price and worked as expected.
This was easy to connect, and worked with my elderly Sony turntable right out of the box. Plus I really like the look of the preamp, Fosi designed a great product.
Great product at a great price. Love what you’re doing
I wanted to connect my Technics record player to a 36 year old Kenwood GE-1100 24 band equalizer and this worked perfectly. Provides a clean sound and has an interesting look as a bonus.
Came as expected, easy to install, sounds PHENOMENAL for the price
Easy to connect, produces warm, fuzzy sound. Looks great next to my audio-technica turntable
It is an awesome preamp. I'm very happy with it!
It's still early... ask me after a month or six months of use. But after a few listens, I'm very happy with the preamp. This was an upgrade from my previous one. Now I need to upgrade the rest of my system.