It depends on the piece of gear as to which you need. You either have to deal with internally-generated vibrations (like from a large power transformer inside a component) or externally-generated vibrations (like those coming from a speaker, through the floor and rack, to the component).
If your component support is very solid, then draining internal vibrations to the support is the better method. This is particularly true for your BDP since its transport mechanism produces internal vibration. Your preamp is probably fairly neutral either way so you could use the same supports under both.
As for what kind of footers, that totally depends on the individual application, i.e., weight of the component, support type, flooring type, speaker size (bass capability), etc.
You can easily experiment for little money. I've made my own using cork board, foam core, SCUBA lead shot weights, Vibrapods, granite, slate, weight on top of the component (this one is not to be underestimated), rubber stoppers, cork stoppers, wood blocks, racket and super balls cut in half, etc. Once you find something that works, you can determine which fancy tweak you should go for. Or just keep using your cheap tweak! Some of them will make a real difference.
Hope that helps.
Arthur
If your component support is very solid, then draining internal vibrations to the support is the better method. This is particularly true for your BDP since its transport mechanism produces internal vibration. Your preamp is probably fairly neutral either way so you could use the same supports under both.
As for what kind of footers, that totally depends on the individual application, i.e., weight of the component, support type, flooring type, speaker size (bass capability), etc.
You can easily experiment for little money. I've made my own using cork board, foam core, SCUBA lead shot weights, Vibrapods, granite, slate, weight on top of the component (this one is not to be underestimated), rubber stoppers, cork stoppers, wood blocks, racket and super balls cut in half, etc. Once you find something that works, you can determine which fancy tweak you should go for. Or just keep using your cheap tweak! Some of them will make a real difference.
Hope that helps.
Arthur