Decooney is right on target speaking to the areas of the sound quality differences that capacitors can make being a positive or negative in your system. If the sound fits your system, as in not being too bright or harsh or on the other side, not being too veiled and dark, then you may want to stick with what you have. If you like the sound you have but are looking for more air and “hear through” into the music then you may want to look for a higher quality capacitor or you may just want to improve your power supply filtering. My system got so detailed at one point I had to make some changes to make it fuller and weightier.
One thing I never had anybody dislike is using large value bypass caps across all the large screw top electrolytic PS capacitors. Of course, we typically used the Solen capacitors because you could get large values of polypropylene capacitance in a small package at a low price. You can then use a smaller value, very high-quality cap across the solen capacitor. It really cleans up the power supply and improves the overall sound quality giving you much more transparency and sound stage. A blacker background.
Also, don’t forget acoustic room correction! That makes a huge difference. Even just small things as in a few acoustic tiles or a few pieces of foam in the right places can really help.
I built a completely hard wired version of a SLP-05 with a very large external power supply that has a larger transformer, choke input and several 100uf Solen capacitors in it along with much larger electrolytic cans. It also has some other tricked out dual mono regulation circuitry that divides the line sections from the balanced sections. I really enjoy being able to sit down to listen music. Every time I bring someone in to listen they turn around and look at me and say something like, this is more like an experience than it is listening to music. I say exactly!
