I'm kinda curious where you came up with that, since by cap volts I assume you mean its maximum rating. Whereas the onboard voltage being the power lines nominal value... Granted the act of keeping further away from the maximum rating would probably yield a capacitance that's more in line with the given value; it's amazing to see how much components skew from their ideal linear behavior.
Capacitance is capacitance(governing I=C*dV/dt), except for the parasitic effects ever present in the real world that cause ESR and ESL, which are models used to explain the difference in frequency response from the ideal in a more linear and understandable fashion. Of course it just so happens the dielectric used is the major factor in the ESR and ESL, which is where the most benefit would come from.
Either way, the only thing that matters is the output sounding good
As long as you're modifying only the power caps there shouldn't be too much of a problem, as you shouldn't be messing up any signal filtering that depends directly on the capacitance.
Ack, I thought I was done thinking about capacitors in depth after my circuits courses, but now I have some strange urge to actually understand them after knowing more pieces to the puzzle....
http://wiki.xtronics.com/index.php/Capacitors_and_ESR has some good notes on the ESR subject (it also has a good disclaimer on the top
). Oh how e^(j*theta) = cos(theta) + j*sin(theta) has changed my life... perhaps for the worse? *maniacle laughter*
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