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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Fosi Audio Box X2 Phono Preamp for MM Turntable Phonograph Preamplifier with Gain Gear Mini Stereo Audio Hi-Fi Pre-Amplifier for Record Player with DC 12V Power Supply
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Fosi Audio Box X2 Phono Preamp for Turntable Preamplifier and Banana Plugs 2 Pairs / 4 pcs$72.98 $79.98This bundle contains 2 items -
Fosi Audio Box X2 Phono Preamp for Turntable Preamplifier and Box X1 Phono Preamp for MM Turntable$92.98 $109.98This bundle contains 2 items -
Fosi Audio Box X2 Phono Preamp for Turntable Preamplifier and Fosi Audio Box X4 Phono Preamp Headphone Amplifier/Preamp$132.98 $159.98This bundle contains 2 items -
Fosi Audio Box X2 Phono Preamp for MM Turntable Phonograph Preamplifier and V3 Stereo Amplifier Home Audio 300 Watts x2 Power TPA3255 Class D Mini Amp 2 Channel Audio Component$144.99 $159.98This bundle contains 2 items -
Fosi Audio Box X2 Phono Preamp for MM Turntable Phonograph Preamplifier and TB10D 600W TPA3255 Power Amplifier Home Audio HiFi Stereo Class D Digital 2 Channel$124.99 $149.98This bundle contains 2 items -
Fosi Audio Box X2 Phono Preamp for MM Turntable Phonograph Preamplifier and Fosi Audio 7-Pin 5654W Tested/Matched Vacuum Tubes$85.99 $89.98This bundle contains 2 items
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This Item  Fosi Audio Box X2 Phono Preamp for MM Turntable Phonograph Preamplifier with Gain Gear Mini Stereo Audio Hi-Fi Pre-Amplifier for Record Player with DC 12V Power Supply |  | ![MM Phono Preamplifier, Hi-Fi Turntable Preamp for Home Audio/Record Player/Stereo Amplifier/Active Speaker [Nobsound T3]](https://m.media-amazon.com/images/I/41Z613sRU9L._AC_.jpg) |  |  |  | |
| Price | $69.99 | $39.99 | $54.99 | $129.00 | $79.99 | $64.67 |
| Delivery | Get it as soon as Friday, May 17 | Get it as soon as Friday, May 17 | Get it as soon as Friday, May 17 | Get it as soon as Friday, May 17 | Get it as soon as Friday, May 17 | Get it as soon as Friday, May 17 |
| Customer Ratings | ||||||
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| Quality of material | ||||||
| Value for money | ||||||
| Easy to install | ||||||
| Sold By | Fosi Audio | Fosi Audio | DoukAudio | GRAMOPHONE | Fosi Audio | GearTree |
| number of channels | 2 | 2 | — | 2 | 2 | 2 |
| voltage | 220 volts | 220 volts | 12 volts | 240 volts | 220 volts | 240 volts |
| mounting type | — | — | Surface Mount | Surface Mount | — | Surface Mount |
Product Description
Tube MM Phono Preamplifier
Our Story
Fosi Audio was founded with a simple goal: Build products that sound great and make people want to listen to music every day. We design, manufacture, and sell many Hi-Fi audio products on the market. We pursue your perfect music journey. Enjoy Hi-Fi music with Fosi Audio audio products!
Tube MM Phono Preamplifier/Tube Preamp
Product Parameters:
- Power Adapter Output: 12V/1.5A
- Product Adapter Input Voltage Range: AC 110V - 240V
- Box X2 Phono Preamp DC Input Voltage: 12V
- Output Voltage Level: 600 Mv @3mV 1kHz
- SNR ≥ 98dB
- THD ≤ 0.1%
- Frequency Response: Standard RIAA
- Product Weight: 0.66 lb/300g
- Product Dimensions: 4.66 inch/3.85 inch/1.29 inch
- 2 Channel Power Amp: BT10A, BT20A, TB10A, TB10D, V1.0B, V1.0G, TDA7498E, ZK-1002, ZK-502T.
- 2.1 Channel Power Amp: BT30D, BT30D Pro, BL20A, BL20C, ZK-TB21.
- DAC: Q4, K5 Pro, DS1, DS2. DAC Amplifier: PH04, DA2120A, DA2120C.
- Subwoofer Amp: TP-02, M01-BT, M02, M03, M04.
- Phono Preamp: BOX X1, BOX X2, BOX X3, BOX X4. Tube Preamp: P1.
- Tube Headphone Amplifier: T20, T20X, P2.
- Class AB Amplifier: T3.
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Tube PreamplifierAudiophile-grade amplification modules offer outstanding performance with their Low-Noise Audio Operational Preamplifiers. It's also a tube preamp with 3.5mm AUX Input. Designed and assembled by Fosi Audio from high-quality components. |
Gain AdjustmentThree switchable gain modes: 39, 42, 45 dB. Adjustable gain levels to give you customizable control and outstanding compatibility. Entry-Level high-end analog sound and top-notch circuitry for an unbeatable low cost. |
MM Turntable PreampSuitable for moving-magnet (MM) cartridges. Precise RIAA equalization. Consistent sonic performance, super low noise. This mini preamp has stereo RCA inputs and stereo RCA outputs Connect the turntable to the RCA inputs and ground. |
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12V/1.5A Power AdapterThe power supply has performances such as short-circuit protection and overload protection. And effectively reduce the impact of AC input. |
Replaceable Vacuum TubesApplicable vacuum tube model: 6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc. |
FREE RCA CableFosi Audio Box X2 preamp comes with a FREE RCA cable. Unbeatable low cost for a home audio phonograph preamp. |
In order to fix the issue you may have more effectively, here are some tips:
--What to do if pre-amp not working?
1. All cables are securely in place and correctly connected.
2. Try a different power adapter.
3. Make sure that the turntable has a Phono output with an MM cartridge. Some turntables have a built-in phono preamplifier, set it to a Phono switch.
4. Feed the turntable’s output to the "MM input" of the preamp.
5. Check if the audio source, preamp, amplifier, or powered speakers all are turned on and in working mode.
6. If it is a tube phono preamp, check the seating of the tubes and swap them out with other working tubes.
7. Replace with the high-quality cable.
8. If it supports multiple inputs and outputs, try others to see if it is working.
--About sound issues or not working properly:
1. Make sure all the cables are fully connected.
2. Adjust the treble and bass control of the power amplifier to achieve the right tone.
3. Please try to change the sound source and cables to test.
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| BOX X1 | BOX X2 | BOX X3 | BOX X4 | P3 | V3 | |
| Customer Reviews |
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| Price | $39.99 | $69.99 | $79.99 | $89.99 | $79.99 | $89.99 |
| Type | Phono Preamp | Phono Preamp with Vacumm Tubes | Phono Preamp with Vacumm Tubes | Phono Preamp with Vacumm Tubes | Headphone Amp +Preamp | 2.0 CH Amp |
| MAX Power Output | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | 300W x 2 |
| Input | RCA | RCA+3.5mm AUX | Bluetooth + AUX + RCA | RCA+3.5mm AUX | Bluetooth + RCA | RCA |
| Output | Active Speakers + Headphone | Active Speakers | Active speakers | RCA+3.5mm AUX | RCA + 3.5mm Headphone + AUX | Passive Speakers+Pre-Out |
| Treble & Bass Control | x | x | ✓ | ✓ | ✓ | x |
| THD | ≤ 0.08% | ≤ 0.1% | ≤0.1% | ≤0.1% | ≤ 0.02% | <0.003% |
| SNR | ≥ 70dB | ≥ 98dB | ≥70dB | ≥70dB | ≥103dB | ≥110dB |
| Terminating Impedance | - | - | - | - | - | 2-8 Ohm |
| Power Adapter | 12V/1.5A | 12V/1.5A | 12V/1.5A | 12V/1.5A | 12V/1.5A | 32V/5A |
| Work Voltage | AC 110V - 240V | AC 110V - 240V | AC 100V - 240V/ DC 12V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V |
From the brand
Amplifying Your Voice, Shaping Our Innovation
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Discover Fosi Audio - Your HiFi Solution! We're a tech-driven brand, crafting innovative audio products around the world. Our vision: Affordable excellence for each consumer. Our mission: Redefining HiFi with cost-effective innovations. Join Fosi Audio on this unique audio journey!
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Fosi Audio V3
TPA3255 Class D Home Audio Mini Speaker 2 Channel Amp 300 Watts x2
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Videos
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Customer Review: A great preamp for the price
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Customer Review: Great phono preamp for the price
frank
Reviews with images
Great product! Crappy shipping!
Got this after watching many YouTube videos about it. I originally used the onboard preamp on my turntable (AT-LP60) which worked fine but wanted to try an actual preamp as it’s supposed to improve the sound. Keep in mind my audio setup is pretty basic, but the difference was amazing! The definition it added was immediately noticeable. My only complaint which I made to Amazon is they took a piece of audio equipment and decided that shipping it in a bag was sufficient. As you can see in the pic the box was significantly damaged. Keep in mind two glass tubes are shipped in it as well. Fortunately Fosi packaged it well enough the contents were undamaged. FYI the tubes when placed aren’t exactly level (at least in mine). Which is fine but I thought I didn’t have it in all the way. Finally I decided to try it out as it was and it worked perfectly. Give it a try especially if your system is more on the economical side like mine.
Top reviews from the United States
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Reviewed in the United States on December 8, 2023
Reviewed in the United States on November 12, 2023
I am using it for a 1971 Sansui SR-1050c Turntable into an Onkyo TX-SR806 Home Theater Amp. The sound is warm and fairly dynamic... I haven't tested it on a lot of LPs yet, but the ones I have tested sound very good... Running vintage turntables into modern day digital processing amplifiers, probably isn't the greatest set-up, but until I finish restoring my Marantz Amplifier, it will have to do....
A couple things I should mention.... The blue LEDs that light up through the underside of each tube, looks pretty cool IMHO.... I am using the highest gain level on the pre-amp (45db), but I'm sure that some LPs would sound just fine on the lower settings. For some reason, the Phono input on my Onkyo amp sounded very distorted, so I am using the CD input with no problems. Lastly.... I like the fact that the pre-amp has an on/off switch... Sounds trivial, but the JANCANE did not have one. I rarely leave product feedback, but I felt that this product deserved a good review.... I am quite happy with my purchase....
Thanks and Happy Listening ! ... Rick Scouler
Works as Advertised.... Nice Sounding, Nice Looking, and Good Value for the Money (IMHO)
Reviewed in the United States on November 12, 2023
I first purchased a low-budget JANCANE pre-amp thinking that it would be all I needed.... Unfortunately, it was sub-par in my book.... So I stepped up a bit and ordered the Fosi Audio Box X2 Phono Preamp. The item came well boxed, and everything was in tact. Easy to put the tubes in, and easy to hook up....Reviewed in the United States on November 12, 2023
I am using it for a 1971 Sansui SR-1050c Turntable into an Onkyo TX-SR806 Home Theater Amp. The sound is warm and fairly dynamic... I haven't tested it on a lot of LPs yet, but the ones I have tested sound very good... Running vintage turntables into modern day digital processing amplifiers, probably isn't the greatest set-up, but until I finish restoring my Marantz Amplifier, it will have to do....
A couple things I should mention.... The blue LEDs that light up through the underside of each tube, looks pretty cool IMHO.... I am using the highest gain level on the pre-amp (45db), but I'm sure that some LPs would sound just fine on the lower settings. For some reason, the Phono input on my Onkyo amp sounded very distorted, so I am using the CD input with no problems. Lastly.... I like the fact that the pre-amp has an on/off switch... Sounds trivial, but the JANCANE did not have one. I rarely leave product feedback, but I felt that this product deserved a good review.... I am quite happy with my purchase....
Thanks and Happy Listening ! ... Rick Scouler
Images in this review
Reviewed in the United States on March 19, 2024
Reviewed in the United States on April 26, 2024
Top reviews from other countries
Luciano Fernandes
Um produto que necessita de um upgrade ja na compra
Reviewed in Brazil on October 3, 2023
