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because there are different types of speakers. for example my subs are dual 4ohm(dual voice coil sub). the amp running them is stable at 4, 2 and 1ohm. at 4ohm-400watts, 2ohm-600w & 1ohm-800w. since the rms wattage of the subs combined is 1000w, i would want to wire them to take full advantage of the 800w@1ohm. so i wired the coils of each sub in parallel, turning the dual 4ohm load into two single 2ohms. then wired the pair of 2ohm in parallel to create a 1ohm load.
bridging is capable when you have an amp with 2 channels or more. say for instance you have a amp thats rated at 75x2. you would wire a speaker to the + of one chan. and the - of the other... and the output would be 200x1. and that i know of, after bridging an amp its only stable at 4ohms.
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