Hari Om Tat Sat

Bathe in the centre of sound, as in the continuous sound of a waterfall. Or, by putting your fingers in the ears, hear the sound of sounds.
~ Shiva

You are always in the centre of sound, so this is easy. Just close your eyes and listen to the sounds around you. Allow all the sounds of Now to enter, do not choose or reject any sound. Choiceless listening to Now is always a fast way to tune in. By closing your ears you may hear an inner sound. If you do, this method is beautiful. Just listen and let the sound carry you in. Merge with the source of the sound.
Hari Om Tat Sat. ~Maitreya Ishwara