Missing Sound Frequencies? WHY add signals w/ signal summing - EXPLAINED!What wires do you need to connect to your DSP or line output converter for your aftermarket car audio system? Do they provide a full range signal? Here is why we need signal summing... explained! Test and Measure with the DM-RTA from show sponsor AudioControl! https://www.audiocontrol.com/pro-audio/🔊 Want more? Check out these links: ✅Car Audio Tutorial Library: https://bit.ly/CAFlearn ✅ FREE weekly training program: htt