Headphones work also.
Speakers are better, because the field through sound can integrate more easily to your aura (this is your field). 95% of your mind is controlled by the subconscious and only 5% we can use most of the time. Of course there are people who break that rule, but in society when you go to work, talk with people , have hundred things to do - you are not aware 100% of the time. You go on autopilot…
It can be said that our bodies are our subconsciousness. Imagine now you are a baby and try to walk. You fall hundred times before you can coordinate (your mind wants and sees in other people HOW TO, but you can’t still). When there are repeating thoughts and actions the physical body after that knows what to do even when you are not aware of that.
See tomorrow how you are going to work. Most of the people didn’t see anything on the way and can’t remember anything for traffic, etc. Because you subconsciousness makes this for you until you are thinking other things (you are not even on the road in your mind).
So, headphones work, but speakers are better as it integrates more easily.