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

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!

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 cord

Purchased during a Lightning Sale with 20% off. Unit is very versatile and use primarily to drive earphones with keyboard. All controls and performance are as expected. However three annoying "features". All center on controls, settings, and persistence.1. When turned on, the input resorts to the default of BT. I have to re-set to RCA input.2. When turned on, the volume resets to 0, requiring re-adjustment.3. Really not persistence, but the bass and treble controls are reversed from customy position. Left is treble, Right is Bass. Lucily don't have to adjust this anymore with my primary keyboard source.So, if you don't mind the quirks, it works well. I'm keeping mine, since it's sound performance is the critical factor. Caveat Emptor.

A few years back I bought a Bottlehead tube amplifier kit & built it. I spent hours inside my Sennheiser HD650 headphones powered by that amp & loved them both dearly. Then, like most people, I began to think if that combo was good there must be better. I sold the amp & have missed it ever since. So I bought this inexpensive tube hybrid on a whim. Knowing it takes time to burn in tube amps & also my new Fiio FT-1 Pro planars, I spent the evenings of the last week just listening. At the end of the week both were smoother & warmer. And I must confess that I am VERY impressed with this tiny amplifier! It will never drive a pair of speakers because it is strictly a headphone amp with My Astell&Kern feeding it through bluetooth into my FT-1 Pro headphones. The amp & headphones are $300 together, so this is probably the sweetest place I can think to listen to my favorite music for an absolute steal of a price!

Funciona increíble, no he tenido hasta el momento ningun inconveniente. Los uso con unos monitores German Akustic

This amp sounds great when playing at moderate volumes. Worked good with my TV and streaming music.I then took it to work to use as a desktop DAC/Amp with the same speakers (Micca MB42x G2s). It failed pretty miserably in that application. With the volume low when the audio track dips to vocals only or light instrumentals it will cut out entirely. In order to mitigate this I had to turn it up to a volume level that is not appropriate for an office setting.With a different Dayton amp the speakers functioned perfectly. I found a small thread on a forum discussing this and several others are having the same experience. Supposedly Fosi is working on a solution but I believe I will be returning this unit.

Using with my Mac Studio. Blows the doors off the Mac’s DAC. Fantastic sound. Utterly amazed something that small can sound that good. Bought this after getting Fosi mono blocks to drive my Inifinity RS 2.5s. Those also sound great.

Lower power than the Douk Audio amp which is even cheaper. But it's sound good.