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Car audio purists, don't crucify this post.  The point is to illustrate/conceptualize an example :).  Typically this scenario applies to rear speakers in a car. Almost everyone is familiar with amp ratings like 500 watts x 1 @ 4ohms when talking subwoofers. Well, the same applies to radios and interior speakers because guess what, your radio has an amplifier inside it :). Only in this scenario there is an additional factor that people always skip over.....speaker wire resistance. Just like sub amps radios have a sweet spot where they work the best, and that typically is at 4 ohms of...

Pretty good high level overview on what's involved in replacing worn, tired, beat, weak, leaky, dirty calipers!