well this is up there as the most retarded thread.
yes it can. it was actually designed for SQ purposes. sometimes, your electrical system will be slow to supply your amp with current on heavy bass notes, usually a 1 second delay, so a cap can discaharge quickly, and make that note smooth vs. muddy. now i suppose that is what you mean by change sound, and it's still debatable if caps even do that, and furthermore this is all in regards to stiffening capacitors. unless you are taking about capacitors used in passive xovers....