[quote author="cuelist"]I would increase to at least 1000u if you intend to drive 1k loads or higher.[/quote]
Math seems completely wrong here...
The higher the load impedance, the BETTER a given cap value will perform, and the less need to increase the value.
Using 100µF, the corner frequency should be in the region of 5Hz into a 600Ω load, shouldn't it? -If that sounds like you're losing bottom end, feel free to put whatever size cap makes you feel good in there.
For local decoupling by that IC, what you really need is something fast, so 100nF ceramic will be fine.
I really don't get into the whole "X type of dielectric sounds mushy (or whatever) to me" debate. If you are going to spend time debating over that sort of thing, remember that time is money. 100nF caps are usually only a few pennies no matter what they're made of. Buy some ceramic, some polyester, polyprop, some silver mica, some pressed silk and some unobtanium. If you can hear a difference, feel good that you took the time. It cost you less to "buy-em an' try-em" than the time you would spend discussing which is going to sound better...
All I know is that if you put dodgy electrolytics in there as local high-frequency stabilisers, things get unstable. That's what the 100nF caps are there for, and using ceramic close to the chip I don't get any instability. I'm sure that anything that performs better than writing paper between two sheets of tinfoil will work just fine...
:wink:
Keith