How to install subs+amp BMW e90 WORKS ON ALL VEHICLES!!
Sub and amp install. If the battery is in the front, same process but you must run positive wire through firewall to where ever you are mounting your amp. Line out converter is not 100% necessary, you can tie straight into the speaker wire but it can very easily damage the amp or the car stereo system. If you are not installing in an e90 BMW your factory amp will likely be in a different place but should not be hard to find. This is the same fundamental process for all vehicles.
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