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The Fosi Audio Box X2 is a compact, high-fidelity tube phono preamp designed to convert MM turntable signals into clear, line-level audio. Featuring three switchable gain settings (39, 42, 45 dB), low-noise circuitry with grounding protection, and compatibility with various vacuum tubes, it delivers warm, analog sound ideal for audiophiles and vinyl enthusiasts. The package includes vacuum tubes, RCA cable, power adapter, and an 18-month global warranty, making it a reliable upgrade for any record player setup.


















| ASIN | B07XNTHHBP |
| Best Sellers Rank | #30,709 in Electronics ( See Top 100 in Electronics ) #8 in Home Audio Preamplifiers |
| Brand Name | Fosi Audio |
| Customer Reviews | 4.5 4.5 out of 5 stars (3,156) |
| Item Dimensions | 11.8 x 9.8 x 3.3 centimeters |
| Item Weight | 0.68 Pounds |
| Manufacturer | Fosi Audio |
| Maximum Supply Voltage | 12 Volts (DC) |
| Minimum Supply Voltage | 12 Volts (DC) |
| Model | BoxX2 |
| Mounting Type | Freestanding |
| Number of Channels | 1 |
| Output Power | 12 Volts |
| Package Type Name | box |
| Specification Met | Standard Riaa, Ce |
| Voltage | 12 Volts (DC) |
J**Y
Opened up the sound
This perform better than the inbuilt phono stage of the turntable or the onkyo receiver. The voice is warm and pleasent. A good stylus with the phono preamp is a must if you have a turntable.
M**S
Works fine but power adapter not suited for UAE
This item does the job with my record player (Fluance RT85) however one little gripe is that the plus is not suitable for UAE/UK - it is a 2 pin plug. It is on the product page as an image (not text) but after some scrolling - would help if its in title description. Small gripe to an otherwise great product.
A**E
Dei mais pontecia na minha agulha!top
P**R
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.
M**L
Snabb leverans och bra pris
M**T
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
N**N
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.
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