Can I listen to the NuCalm software of on a speaker? Alyson July 02, 2020 05:02 Updated The NuCalm software is delivering specific frequencies in each ear and requires headphones or earbuds to slow brainwaves. Related articles Can I buy just the app? Can I use my own headphones or earbuds? What is the difference between the two Discs? Does NuCalm work with if I am hard of hearing or have hearing implants? What is the best time to use NuCalm?