As a general rule, the larger the capacitor in value, the lower the ESR. ESR is basically the series resistance of the cap and we want to keep that as low as possible. If you can find ESR specs for various caps, take that into consideration when shopping around.
As far as bypassing high value caps, i see no problem with doing so. I typically prefer to run multiple different values of caps if possible. Rather than just run one huge cap ( etc ) with a bypass cap, you can use several smaller caps of various ratings that equal the same appr value. By staggering their values, you stagger their charge / discharge rates and create a more effective filter over a wider bandwidth with less ripple. In the array of caps used, one can easily mix in some smaller values that would act as a bypass for the larger value caps.
The problem with doing so is that it can become rather unsightly i.e. a bunch of different sized caps, both in length and in diameter, sticking up all over the place. This is both a more costly route to go and more time consuming, hence the lack of commercial products that utilize such an approach. As a hands on DIY type of installation though, there's nothing from stopping someone from going this route other than time, patience and space within the unit itself. Sean
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