What are the types of Nada?
Meaning of Ahata and Anahata
Ahata = To struck, to hit, The sound production by hitting a material thing
Anahata = The sound production by without hitting anything, the universal sound
The word "Ahata" literally means to hit or struck a material thing. The Nada Sound or Vibration produces when we hit on a material such as Sound Bowl or Gong. Every sound has a medium of sound or vibration production. Without any source, no sound can be produced. But the sound Ahata is mortal. For example, you play the Gong with more force, and it will keep making a sound until and unless the frequency is low and after that, it finishes.
All sounds produced by Ahata are artificial which can be controlled by us. Ahata sounds are beautiful or noisy depends on the medium and the producer. The Meditation on Ahata Nada is recommended but the best suggestion is using Vedic Sound Instruments because the sound is much clear and beautiful in Vedic instruments such as the flute.
The word "Anahata" literally means the sound which can not be produced by hitting the material together. Anahata refers to the universal sound which is automatically produced in the universe with the same tempo/speed, same vibration, and same frequency. The universe is really extensive or huge. It is limitless and what we know about it is only an observable part of the universe. If you meditate in any corner of the universe, and distract yourself with the mortal sound and try to listen to the universal sound, you will feel so connecting to God and go for self-realization.
The sound produced in Anahata is natural, universal, automatic, and remains the same in all situations. It can not be controlled by anyone or divert.
About Nada Meditation
When a practitioner does Meditation with Ahata or Anahata, called Nada Meditation. In this Meditation, a yogi concentrate his mind on the sound or vibration. Nada is a sound without any meaning or words/phrases etc., that's why there is no meaning of Nada Sound. Nada Meditation is practiced by thousands of people because this is not about any religion and does not promote any special area or people.
When some words come into any sound frequently, it may promote any type of culture, area, people, etc. Nada is optimal Meditation because it is not about any kind of promotion. It heals you like the sea waves do, as the singing bowl does, temple rings do, waterfalls do, flutes do, and many others.
Meditation on Ahata Nada
1) Ancient musical instrument such as the Flute
2) Meditate on Sitar
3) Meditate on Tabla and Sarang
4) Instrumental Music of Gayatri Mantra (only music)
5) Meditate on natural sounds such as river water
Meditation on Anahata Nada
1) Meditate on Soul
2) Meditate on the sound of breath
3) Meditate on the sound of the brain
4) Meditate of vibration of the body
5) Meditate on the heartbeat
Benefits of Nada Meditation
1) Energy conservation
2) Increase the level of concentration
6) Increase dedication
7) Increase consistency
9) Healthy Heart
10) Healthy Brain
11) Increase memory power
12) Reduce Stress
13) Fix the mood
14) Fix the blood pressure issues
15) Decrease anger