Keith_W
Major Contributor
Couldn't find much about Stealth - sound leakage
Sound leakage depends on you and your head. Headphones are like clothes which are "one size fits all" - it will fit some people better than others. Even the frequency response will be different the moment you put it on your head, unless your head and ears are exactly the same as the test dummy. Your pinna and ear canal will modify the upper frequency response > 3kHz. Anything <300Hz will be affected by fit issues, including sound leakage.
I will say that my Stealths have nice soft earpads and they fit my head, although I do get a poor seal if I wear my glasses. But my experience is not generalizable to you. I suggest you try them on and find out for yourself if there is sound leakage on your head.