Trying to upgrade my headset for my home office, I was confused between
RJ9 vs RJ11 connectors. I brought both options to Technetron Electronics, and one of their technicians gave me a detailed walkthrough on compatibility, usage, and why one might be used for phones and the other for audio equipment. Their knowledge helped me avoid a costly mistake, and I left the shop better informed. These kinds of insights are why I keep going back.