Building a Custom Trunk Beauty Panel - Matching Sides and Spare Tire CoverMany aftermarket head units now have an "EQ" or equalizer built in. What is the equalizer for and how do we tune and set it on our head unit car stereo? Should we use an RTA? Is this a replacement for a stand alone Digital Signal Processor (DSP)? Let's go through the process!🔨 Tune your system with AudioControl's SA-4100i SPL Mic!✔️ Learn more here: https://www.audiocontrol.com/pro-audio/ios-microphones/sa-4140i-spl/ Th