A remote controlled volume control and source selector at least.
A Fosi V3 is 120€ at Amazon Germany, add 50€ if you want the 48v power supply. Add 55€ for the source selector and you are at 225€.
You still have no remote, tone control, headphone out, bluetooth or switchable speaker output.
You can get this for 220€ at Amazon Germany ($180 in the US i think):
View attachment 314377
I haven't looked into other "classic" amps and receivers, but i know Sony and Denon have something in that price bracket.
The Fosi V3 has it's place and is a great device, but it's functionality is very basic.
In my opinion most people will outgrow it quickly and then the value proposition doesn't look that good anymore.
Fair enough. Still, you have a rats nest and don't come close to the functionality the Yamaha offers for not that much more money.
I'm not saying you shouldn't buy the V3. I'm saying it's value is maybe smaller than most anticipate, when they only look at price and SINAD. Situations, rooms, speakers, they all can change.
There is an argument for the Japanese solution and depending on the results of the measurements, i might spam every cheap TI chip amp thread with it.
As you can see in my earlier post, I agreed with you, but again, for those using it purely as a power amp it is a very good value and excellent value at the current 20% discount price. Yamaha competes well in entry level integrated amps but not in power amps. If they did, they may be able to offer one at competitive price as the Fosi amp, but they don't so like you said, "the Fosi V3 has it's place...." I have enough preamps, so adding a tiny power amp is easy for me as I don't need a remote for any or my power amps, ommv....