Using one speaker for 2 chanels

Hello . Im using two 4 inch speakers and one 6.5 midrange speaker because thats all i have room for in my car . I planning on using a 4 channel amplifier. If i use channel 1/2 for the 4inch speakers. What would be the best way two wire the 3rd speaker from channels 3/4 . If i bridge is this going to make it a mono sound ? I was thinking of using pos of 3rd channel and neg of 4th channel too the speaker in hopes i would get more power to the speaker but would this make the speaker sound like a woofer ? Im using the alpine ktp-445u . Please advise
 
Paralleling two amp channels to one speaker will damage the amplifiers.
Some amplifiers will accept + of one to a speaker and - of other to the other speaker terminal. Others will not, it would cause damage. If you have a throwaway amplifier/player then you can try it. I would expect any negative feedback on both channels to make the sound bad.
 
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