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

I had heard good things about this manufacturer's amplifiers, and I needed something a little more than a one input amplifier. This integrated amplifier allows you to connect via Bluetooth, USB-C, RCA and optical, allowing me to use this to connect to an Arylic streamer and my PC. I was initially reluctant to purchase something that uses tube technology, since I'm not sure how long they will last. My previous solid state receiver lasted 20 years with no issues until last month when it started getting cross talk issues between FM and other inputs. With the Fosi MC 331 on sale I thought I'd take a chance.My concerns are unfounded so far, since the tubes are only for the pre-amp stage and are easy to insert and replace. I've even come across some suggested tubes that allegedly improve the sound, although the sound with the included tubes is terrific.I'm not crazy about the user interface, since the volume dial is used to adjust the volume, switch between the sources by single clicking, and a power switch, by long pressing.I have some unusual banana plugs that I was unable to use since they are not the usual type but are flexible and intended to be used in the clip type speaker posts but this amp only allows for standard rigid banana plugs and using bare wire to insert into holes under the twist-tight speaker posts. You'll be better off with thinner speaker wire if you don't have rigid banana plugs and need to attach using bare wire, as the 14 AWG speaker wire I use barely fits. Thinner wires are fine for shorter runs, so I wouldn't be worried if this were to power nearby bookshelf speakers, which I suspect will be the most frequent use case for this amp.The built-in Texas Instrument DAC allows this to be connected to my PC via USB-C cable and the improvement over the original Realtek sound from the HP PC and RCA cables was noticeable.Some caveats: the manufacturer provides tube protectors to keep you from touching the glass tubes as they are fragile and get quite hot so don't touch them with the power on. It takes the tubes 15 to 20 seconds to warm up, so make sure to turn the amp on before you sit down to enjoy your music.This amp is tiny and fits easily on the shelf with the shelf speakers, which are 10 1/2 inches tall. By comparison. the receiver this replaced took up all the available shelf space. Have to move some stuff around now with the extra space.This also has a headphone amp, but note that while using the headphone output, the speaker outputs are not available.A remote control is included, but you'll need two AAA batteries, as none are supplied.If I run into any issues with this I'll update the review, but so far very happy with this purchase.

A simple tube based power amplifier that has a Bluetooth receiver that can pair with up to 10 devices. It will only receive from one device at a time, so you need to turn off the Bluetooth device on are not trying to pair with when switching between Dec, but this is to be expected. I have used it with a Bluetooth enabled turntable, and a couple of iPhones. All worked as expected. I also tried a very inexpensive Bluetooth enabled pocket cassette player, and would not pair. So, your mileage may vary.Sound quality is decent, with pretty good bass. Ultimately this is determined largely by the speakers, so the better your speakers, the better the sound. It has a Bass and Treble control, which work, but obviously not as good as a multi channel equalizer.Build quality: Seems good. All the parts were provided and packed properly. I had no difficulty assembling the amplifier, which just involved plugging in the two tubes, screwing in the tube heat protectors, and connecting the cables.Power: The amplifier is rated at 105 watts per channel, into a 4 ohm load,, which is more than enough for any small to medium sized room. I noticed no distortion at any of the sounds levels I was using.The price: at $116 with a small running discount, this amplifier is easily worth the price.You get what you pay for I guess. Overall I am happy this little amplifier. Recommended!

AC connection, unfortunately I was sent either the wrong AC to adaptor cable or the wrong adapter see photos, the amplifier is as beautiful as the photos and feels and looks like quality, I have reached out to the manufacturer through Amazon and hopefully they will send the right adapter and AC cordI have this a month and I have not heard from the manufacturer about sending the wrong AC cable, so I purchased one YES, thats what I had to do, Its great using a separate pre amp to play my vinyl 33's , I attempted to see how it would preform as a home theater amp, NOT SO WELL, it lacked the oomph just couldn't cut it, re connected my Bose soundbar and returned the amp to just playing records and BT only.

Por el precio, este pequeño amplificador es muy completo. Tiene una buena variedad de prestaciones, y todas cumplen lo prometido. No espere la misma calidad de otros amplificadores integrados mas costosos, pero si está empezando en el mundo de audio de alta calidad, esta es una gran opción. Además, es pequeño y lindo. Lo único incómodo es que su fuente de poder es externa, lo cual es un sacrificio que hay que hacer para lograr un tamaño compacto.

I love everything about this Fosi amp. I have it on my back screen porch to power a pair of Polk Audio speakers. The sound is superb. Very clean and clear with good presence through bass and treble. I love the Bluetooth feature and use that to stream various radio stations or my own music apps. I also love the style - love the tubes and the warm glow of the meter. Highly recommend

Brilliant little gem. Sounds fantastic, much less digital sounding than WiiM amp I returned prior to this. Masterpiece of design and form/function. Even the remote is brilliantly designed. I swapped the tubes for Mullard 8100s but I think the stock tubes surprisingly may sound better/warmer. Best $100 I’ve spent in a long time, and I own big $$ home stereo components for a different room too so have some serious gear for comparison. Can drive my 8ohm bookshelf speakers to reference levels at about 50% in a 12x24 room. Using this with a WiiM mini streamer and prefer the DAC in the mini (burr brown) as it’s a bit softer and more organic than the more modern more detailed DAC in the Fosi, and can use the aux out fur subwoofer. Brilliant and flexible package with a tiny footprint. Highly recommended!

Extremely poor sound and not even close to the advertised wattage. Looks cool, but that's about it.