You didn't look up interference
Credibility comes from knowledge. I don't like sharing things like that because I believe the answers are in the meat of the conversation...but you aren't reading the conversation with anything but blinders on so I will. I am a degreed Acoustician. I do consulting work within the audio industry. You name a big speaker manufacturer in the US and I've had engineers there ask for my assistance in development. This includes integration in cars as well. I run a company that has over $10M in audio and vibration measurement equipment in North American alone.
You are missing the fundamental basis for understanding acoustics. I am trying to help, but you are getting defensive instead of reading.