I believe you’re thinking HDCP.

Thanks! I also fixed my link.

Have you tried it?

The AutoEQ project is all I need for great sound.

Shit’s mindblowing with some headphones I’ve tried that need a heavy EQ. Porta Pros are fairly balanced already so not as mindblowing, but still worth at least checking out the demos on the webpage.

AutoEQ is open source. It’s just EQ settings from analyzing frequency responses of headphones.

They don’t block noise. No battery, this is mid-'80s wired tech. There’s a model with a very good microphone. Lifetime warranty. Repairable with super glue sometimes.

At this point I’m surprised there’s still files, and not an AI trained on the files that you have to describe the contents to so it can maybe give you something resembling your file.