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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Check your assumptions...

For instance, you may want to consider your notion that "they better be the same size and type (analogous to having the same pipe diameter for fluid)" as it's in conflict with your argument that all that matters is the resistance. If that's true then who cares if the legs are unequal as long as the loop resistance is unchanged?

Contemplate expanding your mental model of such things as speaker wires. There's more to the system than just controlling the woofer damping. Think about the four decade bandwidth of audio (5-50K) and the modulation of E-field penetration (skin-effect) which ensues. Run an magnetic FEA of a cross slice of a speaker cable across the band. Do it again with plated wire. (You can use FEMM for free.) Think of extraneous coupling due to the current loop size in the cable. Then there's the matter that the cable is mismatched at both ends and that the source and load Z vary with frequency. And of course there's the routine net RLC, but even they can be modulated by mechanical motion due to the electro-dynamic effects of the heavy current flow. And that's just some of the electrical stuff, then there's the metallurgy and ...

Well, you get the idea. Nature's complex and while we all rely greatly upon simplifying assumptions and rules of thumb, they can turn on you if applied too liberally. The world really isn't an LTI system, it's just a crutch for our feeble brains.

So enjoy! It's fun to tweak your assumptions. Mine are sure a lot less dogmatic than they were 20 years ago...

Rick


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  • Check your assumptions... - rick_m 11:26:17 05/08/07 (0)

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