Moderator: Captain Ned
ludi wrote:Simplest way of looking at what the drivers are doing: Each capacitor is acting, in series with the driver voice coil, as a simple high-pass filter. And each speaker will stop reproducing and "roll off" at some upper limit of its own ability to reproduce, which acts as a rudimentary block, also. So the audio spectrum is more or less being partitioned into three chunks and each chunk is being handled by a single driver. 5.2uF and 8R gives a midrange crossover point of about 3800 Hz, and 1.5uF and 8R gives a tweeter crossover point of 13000 Hz (which is a bit too high IMO).
This is also the cheapest possible way to build a speaker crossover. More complex designs will also add inductors, which block high frequencies from going places where they are not needed.
Note that if you put a multimeter at the speaker terminals and measure impedance, you may get some brief blips as those capacitors charge, but in the end, you will only be reading the impedance of the woofer, because you are essentially testing at 0Hz -- which only passes through the woofer.
Wirko wrote:I said it was a crash course...@superjawes - R is not just resistors. A speaker is an electromechanical transducer. A part of R and a part of X are due to the fact that a part of electrical power is converted into sound.
ludi wrote:Just getting past the mental hurdle of understanding non-linear, frequency-dependent impedances is a pretty big leap. I had college coursework, but I still didn't get a firm grasp on it until I had been involved DIY audio for several years.
just brew it! wrote:If you think that's bad... how about characteristic impedance (and impedance discontinuities) of wires/traces/connectors carrying high-frequency signals?