like one of the comment says
"It's always interesting, that random mods ALWAYS gives better results... never bad....Surely it's not brain bias!"
Yes, but not that insightful or helpful and the original poster replied "For sure all my modifications were not always making the sound better. What you read here is the modifications that I kept and that works to improve the sound." Moreover, this does not sound like a random mod to me....well, reading his explanation does not lead me to that conclusion
I was interested in understanding other peoples experience & expertise with similar modifications, are they with merit? An extract of the FB post about the modifications and improvements this person made are:
Now here is the area of improvement for the power in the V3 monos and why:
Electrolytic capacitors are not fast enough to deliver enough energy for the high frequencies. Ok, some smaller value faster capacitors are found on the board, but my finding was - by adding a superfast 1 uF X2 capacitor parallel to each of the two big capacitors it significantly improved the sound - significantly! It was a wow moment! It is the yellow capacitors in the picture of the above view of the board and a closeup picture.
How could this be that it made such a big improvement?
It is feeding a class D amplifier, a pulse switching amplifier. Because the output is very fast switching pulses and not just switching according to the music, it is imperative to have enough big superfast capacitors for the TDA3255 to create exact, fast and powerful pulses. That power chip switches up to 100.000 times per second! The pulses are longer or shorter, depending on the music, and then filtered to smoothen out the pulses to become music (or whatever signal you input.)
On the other power rails having lower voltages I put a small ceramic capacitor parallel to each electrolytic capacitor, intended to give the circuits enough fast energy to reproduce the micro details in the music. They are small enough to easily be soldered on the bottom of the board to the pins of these capacitors (the blue ones in the bottom view picture).
Then I inspected the signal path. As I only use the balanced input, being the best input on the V3 monos, I only upgraded the balanced signal path.
There are used good quality electrolytic capacitors. These are good, but not the best. I decided to change each electrolytic capacitor to Wima red film capacitors. Yes, they are more expensive and would raise the cost of the unit, but soundwise still worth it. The electrolytic value is 10 uF and what I could barely fit in was 4.7 uF Wima film capacitors. Doing so could risk to make the bass become less strong. But after testing I found no reduction to notice at all, and my speakers play all the way down...
I changed 4 but not the 3 ones for RCA input only. They should preferably also be upgraded. The ones I changed are the red squared ones on the top view picture.
Now testing and comparing my modified V3 monos with my big class A/B amps was giving me shivers! Wow, now we're talking high end! Now the Fosi Audio V3 monos are better than my big mono blocks!!
