Most of this is snake oil.
They will have no effect on sound, unless you live in Texas :-), or at a place where power variations are more than 10%. In that case, instead of spending your money on those frivolous items, you should sue your power company anyway, to get better results. In this case, a conditioner is of no use anyway.. and maybe a regenerator may help, if it can keep the mains supply at a relatively stabe +/- 3% of what it is supposed to be.
The power supply, smoothing & decoupling capacitors in your power supply takes care of 99.9% of noise & imperfections in your AC mains.
The rest of the power supply filtering is so that your amplifier does not introduce noise BACK INTO the mains when the rectifier diodes are switching.
Read the section 3.1 of the following CAREFULLY, especially the function of the capacitors, to understand better:
https://www.ti.com/lit/an/snaa057c/snaa057c.pdf?ts=1615230241335&ref_url=https%253A%252F%252Fwww...
They will have no effect on sound, unless you live in Texas :-), or at a place where power variations are more than 10%. In that case, instead of spending your money on those frivolous items, you should sue your power company anyway, to get better results. In this case, a conditioner is of no use anyway.. and maybe a regenerator may help, if it can keep the mains supply at a relatively stabe +/- 3% of what it is supposed to be.
The power supply, smoothing & decoupling capacitors in your power supply takes care of 99.9% of noise & imperfections in your AC mains.
The rest of the power supply filtering is so that your amplifier does not introduce noise BACK INTO the mains when the rectifier diodes are switching.
Read the section 3.1 of the following CAREFULLY, especially the function of the capacitors, to understand better:
https://www.ti.com/lit/an/snaa057c/snaa057c.pdf?ts=1615230241335&ref_url=https%253A%252F%252Fwww...