Originally Posted by AudioJosh
Admittedly I've never measured the difference, I've just always followed the mutually orthongonal (each 90º to the adjacent) rule of thumb.
It is cool.
Rules of thumb are designed to "blur out" icky math and higher order affects. In most cases, following them means less headaches. But it will most definitely result in a non-optimal design in terms of cost vs space vs performance. In my old life designing aerospace electronics I followed rules of thumb almost religiously until "they just didn't work for me". Then I had to dig into the math and figure out what I really needed. In this case I had to because people like to land in the same condition they took off in.
In my current life, cost is critical...so I need to make sure that i'm not over designed because a few % in cost is 10's of thousands of $. In this case i'm balancing total cost of ownership including warranty.
Most DIY'ers should prescribe to rules of thumb until they gain enough knowledge to manage things better. Glad you pointed it out though. Brings up another topic to discuss.