Although subjective to the user, I agree with @ActionGuy. Headphones or speaker work just fine. Dream would say speakers mostly cause back in the day, some of our audios were… very piercing to the ears (like entity removal, testosterone, breast, ext…).
So he would rather people not damage their ears by blasting them at full volume with their headphones, which some people would do thinking that it makes fields work better. Which it wouldn’t btw… low volume works just as well.
So really… that’s mostly a suggestion cause people would choose to over exaggerate things and hurt themselves so speakers was safer option to suggest. I do both speakers and earphones and get the same results from both.
Ok, now lets keep this discussion back on topic