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I have many different pairs of headphones. A car stereo system. A home stereo system. Occasionally, I hook up to FOH mixers.

Analog line level audio is a ubiquitous standard.

Maybe you use your headphones with more than just one device?

I plug my phone into my truck every morning on my way to work.

Even my cheap car has both Bluetooth for audio and a USB port that supports the "iPod protocol" for playing audio via USB.

Your newer car.

Some of us have old cars that we see no need to upgrade.