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the pyramid amp would work, but you would have to run wire throughout your car for it (speakers to amp). hence you had your stuff installed previously i doubt you wanna run a amp yourself. also do you have front and rear outputs on your deck? if not i dunno if you can use it, unless some type of converter.
like everyone is saying check the wiring, check every speaker to see if its connected. my wire has fallen off a speaker before due to a bumpy rd. they could of pulled it out when they were running power wire.
like everyone is saying check the wiring, check every speaker to see if its connected. my wire has fallen off a speaker before due to a bumpy rd. they could of pulled it out when they were running power wire.