Hmmm …. Spending $100 to $200 extra on an external linear power supply for a cheap $80 MSRP FOSI mini integrated amp, (per the FOSI website page) ?
Everything in this crazy hobby is built to its price-point…., full stop.
That annoying digital “glare”, or digital “edge”, or “brittleness” is a direct function of the minimalist build quality of the amp’s components themselves, that isn’t going to be magically eliminated.
.I don’t see the merit in an approach of a new LPS at equal to or double the MSRP price of the amp unit itself. I’d put the $200 toward the cost of a better amp first.
carry on and choose wisely, sir.