Our subliminals are specifically designed to use spatial audio to improve the overall processing, impact, and effectiveness. Different affirmations are delivered to your left and right ears so that the message can penetrate the deepest areas of your subconscious mind. While these effects do significantly enhance the results, they do not mean you absolutely must use headphones.
Whenever possible, you should favor headphones over speakers. That being said, no harm will be done if you listen to subliminals with one headphone. But, as a result of listening with one earbud, it will take longer for the message to register in your subconscious.