Cans are big, inconvenient to carry arround, and have poor noise isolation. Smaller on ear headphones designed for portability are still too big to be worth carrying around, and still have bad noise isolation.   The only headphones I ever consider carrying out into public are iems. They are...

I have a problem on both my desktop and laptop with electrical noise coming out of the audio ports. I know on my laptop it is because of something stupid I did with a usb port that caused leakage from the usb port onto the audio port. On the desktop it is probably not caused by my audio card...