Today I made plans to buy a new pair of headphones for my new metal detector, from my local Jaycar Electronics shop on Boxing Day, in the meantime, I've got two pairs of high-quality headphones I can use, one is a Focusrite Scarlett Studio HP60 Mk II, and the other is an Audio Technica ATH-M30x, both with 6.5mm to 3.5mm stereo adaptors, they are both pro quality headphones that are normally used in music production studios, I happen to have a small computer-based music production studio set up in a spare bedroom in my new flat, hence the reason why I have those headphones, I do realize that you don't necessarily need very high quality headies for metal detecting though.