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Here's what happens on a lot of lower grade audio equipment (yes, even some Klipsch)..
They skimp on the capacitor's rated voltages, so you see, say 63V capacitors a lot of times in the power circuits. Now this is normally fine, as you might have a toroidal transformer that takes 110V to 43V and that 43V AC is rectified into 60.6 volts, which is less than 63V so your caps are ok.
But try checking your outlets with a multimeter some time. A lot of times, depending on a lot of factors like how old the transformers outside your home are and how clean your town's poer grid is... it will not be at 110V. A friend recently had caps fail in a Klipsch powered subwoofer. They were 63V caps running after a 110/43 toroid. His wall voltage was 132V. This puts the input to the caps at around 72 volts, which is more than the 63 volts the caps are rated for, and they start smoking like burnt popcorn.
This is why those high end audio people buy power conditioners. SISO. (Sh$# in, Sh&$ out). You can't expect your audio equipment to sound perfect when the power from the wall is dirtier than a Thai hooker.
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