Good question! This is my understanding of "bi-amping" Bi-amping is using two (2) amps running in stereo to amplify one (1) pair of speakers. Your speakers must be set-up to be bi-wired. Generally on bi-wired speakers, each speaker has two pair of binding posts. One pair for hooking up speaker cables for the bass woofer and another pair for the midrange/tweeters. The idea is to run two amplifiers, both in stereo. One amp will power the bass woofers of each speaker and the other amp will power the mids/tweeters. You will need two pair of speaker cables in this configuration. Impedance is a little tricky. In general terms, nominal impedance is the combined average of drivers in a speaker. If the bass woofer is 4 ohms and the mid/tweeter is 8 ohms your nominal impedance is 6 ohms. In this scenario, the bass amp would be driving a 4ohm load and the amp driving the mid/tweeters would be driving an 8 ohm load. Bi-Wired speaker cables are used when you have one amp driving a pair of speakers that have b-wire connections. The amp end of the speaker cable will have one negative and one positive spade while the speaker end of the cable will have two pair of spades, two positive and two negative. I hope this helps.
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