BMW OEM speaker upgrades done with Vibe Audio BMW replacement Component Split kit Coaxial kit Reference Audio amplifiers and 8inch subwoofer by Violet Automotive. Proper fitment was done using the Vibe Audio BMW replacement speaker kits for front akd rear. Using a 4 channel amplifier allowed us to retain fade and balance. Most installers take a shortcut by using just 1 speaker or maybe 2 speakers to take signal. We maintain using all 4 channels to retain full control of all speakers. We added a

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