Fosi Audio MC331 Tube Integrated Amplifier with DAC, 2 Channel Home Audio Stereo Power Amp for HiFi Bookshelf Speakers/3.5mm Headphones, Vintage VU Meter Preamp with Bluetooth and USB/Opt/Coax/RCA

When I ordered this Integrated Amplifier, I guess I was the 1st person to Order as there were no reviews found. Meanwhile, when this product was shipped, I got to see a review with only 3 Star stating this Amp cannot be connected to a SubWoofer and that made me to feel skeptical, because my main requirement is to use this Amp for my Home PC with a 2.1 setup.Despite this low rating I decided to wait until the Amplifier gets delivered and hence waited patiently. And the day arrived, the first thing that I did was I connected this to my PC and tested all the inputs paired with my Pioneer Vintage Bookshelf speakers along with an Active Subwoofer wherein I connected the subwoofer to its LFE input.Initially, I was shocked to notice that my Subwoofer was silent and there was no BASS - you know I am a BASS lover, I enjoy songs and videos mostly for the deep BASS effects. However, I didn't loose my hope - I have multiple subwoofers, and most of them are custom made with Plate Amplifiers and luckily all my subwoofers are equipped with multiple inputs (RCA Line In, LFE and the Speaker In/Out).In my 2nd attempt to test the Sub I connected the Pre-out from this Amplifier to the 'Line-in' Input of my subwoofer - Oh Man it was a WoW Moment - It worked!! and what a deep bass it was really awesome.For those who says this cannot be connected to a Subwoofer, please note the 'Pre-Out' from this Amplifier is not throwing out any LFE signals, but a 'Stereo Output', which can be connected to another Stereo Amp to power Speaker-B or to an Active Subwoofer that has 'Line-In' RCA Port. At 100Hz this 'Pre-Out' works well with my Subwoofer and there are no flaws, but it might work with different Hz with other brand Subwoofers.I am not using this Integrated Amp with any Headphones, but with my Creative Sound Blaster X4, which supports multiple sampling rates.Pros:1. All inputs are working fine, especially the Bluetooth is excellent.2. It remembers the last used input and selects it when the Amp is turned on.3. Highs and Mids are very clear, but for the Low Frequencies either use a nice Pair of bookshelf speakers or connect a Subwoofer.4. It comes with a compact remote which is not the case in all the brands at this price range.5. It looks very elegant and I love the 'Volume Unit Meter', it makes to feel it Vintage.6. No distortions were observed even at high volume; thanks to the VU-Meter that helps to monitor the db level.7. The Volume control also attenuates the 'Pre-Out' level, which is not found in all the Amplifiers and I have seen few amplifiers that controls only the Stereo and the Subwoofer works even there is no output from the Speakers.Cons:1. There is no ventilation provided for the heat to dissipate like other models in this Brand.2. There is no option to dim the 'VU-Meter' light, which glows very bright.3. Would be great if the input power supply is given as 240V, instead of an external step-down Power Adaptor that limits the Wattage per Channel.4. Should have included a HDMI port with ARC (saying this because it has a wonderful DAC inside).5. Option for connecting a Passive Subwoofer isn't available, would be great if included.6. Installing the Tubes was quite hard and little risky as there is chance for breaking - they should have installed it and modified the Packaging Box so that it becomes a plug and play device without any risks while doing the initial setup.7. There are no indications on the volume level - there is no min/max level set in the Master Volume and hence I am setting the PC Volume to the minimum to avoid any damage to the connected speakers. Also there is no MUTE button included in the Amplifier.Despite having these much cons, I have rated this as 5 Stars because there is no option to mark it as 4.5Overall experience is good and it exceeded my expectations that makes me to give this rating!!!I hope the readers found my review helpful.Thank You.

I have 2 passive speakers from Somy which was placed in store room for quit a long time. As a audiophile I always wanted the Desktop DAC, this product fulfill all the needs. It’s have headphones jack which is compatible with Dolby Atmos. Sound quality is good and Flat! Kindly do not expect bass/thumb on your speakers as this is designed for bookshelf speakers which usually have mid high frequency. I’m liking this product.

The MC331 Tube Integrated Amplifier is a fantastic choice for music enthusiasts, especially those who appreciate vocal-driven tracks.This amplifier delivers a warm, textured sound signature that enhances the clarity and richness of vocals, making them feel natural and soothing. Whether you're listening to your favorite singers or enjoying acoustic sessions, the MC331 elevates the listening experience with its gentle yet detailed tonal delivery.The built-in DAC ensures crisp and accurate audio reproduction, perfectly complementing its tube amplifier's warm characteristics. Its two-channel stereo setup provides a balanced soundstage that feels immersive without overwhelming bass or treble.In terms of value for money, the MC331 stands out. Its combination of premium sound quality, solid build, and elegant design makes it a must-try for audiophiles on a budget. If you're someone who enjoys vocal-centric music or just appreciates refined audio performance, this amplifier is worth the investment.

Has all the connections I want. Sounds great. PS.there Is no connection cables. It is not auto mode so watch out.DAC , power/pre Amps. 2.0

Cannot use additional sub woofer with this setup, it has no output for passive Sub woofer, and if I use active sub woofer with the co axial pre amp output, there will be a crossover of the frequencies of speakers and the sub woofers.

FIRST REVIEW [28 DEC 2024] [2 stars]: I’ve set this up at home on my desk, for casual music playback. I’ve connected a pair of Philips bookshelf speakers for two-channel playback. I primarily use the USB-C port on my MacBook Pro M1 Pro (Model Number: MKGP3HN/A) to connect the MC331. And occasionally use my iPhone 15 to play music via Bluetooth.When I connect the MC331 via the headphone jack, I can choose between several options up to 24-bit 96kHz formats for playback in the Midi setup app. But when I connect it via a USB-C cable, the options are limited to 48kHz and 16-bit. (See attached screenshot)Despite this discrepancy, the user manual states that the device can support up to 24-bit/96kHz playback over USB. (See attached screenshot)I purchased this device specifically for its advertised audio capabilities, and the fact that the amplifier is not functioning as advertised is unacceptable. Reached out to the OEM and they washed off hands saying the manual is incorrect.UPDATED REVIEW [15 JAN 2025] [4 Stars]: After using the amp for a month, here is my updated review. I have tried all other inputs and tested the features of the device and they perform on par with the claims.The 3.5mm and Optical inputs works very well and the sound quality is pretty good. Bluetooth range is also reasonable. Apart fromt the above mentioned shortcoming, I didn't find any other issues. And comparing to other features, I can overlook the limited sampling rate for USB input. And I think the feedback can be changed to 4 stars.