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    Upgrading all speakers and adding subs/amps.

    Bought a 2011 Tahoe (repo) Looking to upgrade the speakers (has Bose system) I’m wanting to add 2 15 inch subs, 1700 watt amp, and add a second amp for all the door/pillar speakers. Ive heard of the big 3 upgrade (haven’t did this yet. Would that upgrade along with a second battery be all i...
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