In this live review I’m checking out two new budget pieces from Fosi Audio: the MC331 tube integrated DAC/amp and the P4 mini analog preamp. Fosi has been impressing the audio community for a while with affordable gear that’s actually fun to use, so the big question here is simple: do these keep that streak going? On paper, the MC331 is trying to do a lot for the money—tube flavor, VU meters, Bluetooth, tone controls, and even speaker outputs—while the P4 keeps it straightforward with multiple RCA inputs, a single RCA out, and tone controls. Just to be clear (like I always am): I’m not a professional sound engineer and I’m not doing measurements or scientific testing here. This is my real-world listening, comparisons, and the kind of research most of us can do at home, with the perspective of someone who’s spent time around audio for years (including church sound booth work). If you’re looking for budget-friendly desktop or small system options with useful features—especially tone controls and simple connectivity—this video walks through what these units are, what they offer, and whether they seem as promising as Fosi’s past budget hits.