Hi Nab, you can use speakers as well. If in the description of the Audible ICs you see that IC is generated as binaural beats, then it is important to use stereo headphones and a speaker and be positioned in between them. Polarity is not required, you can place the right channel of headphones on the left ear and the left channel on the right ear.
Hi, how often do I have to do this per day to achieve a sustainable result? It would be very helpful to indicate in the descriptions how often you have to do this application, for example per day or per week, etc.