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Originally Posted by da goose  OI'm also seriously thinking of going for a T ladder type so that the impandance will remain the same all the time. (is 10k ok or should i go for perhaps 25k?) |
The problem is that you want a high input impedence and a low output impedence. This is impossible with a pad unless there is loss. A 10K output impedence is not good, a 25k output impedence is a disaster. The general rule is a 1:10 source to load impedence ratio. Most modern input impedences are 10k and up. So you really want a 1k output impedence. You can get away with higher but as it increases driving the capacitive cable load becomes more difficult. The problem with a 1k input impedence is that many things won't drive that cleanly. It's a trade off. Fitting passives into an active world isn't easy.