Read this post on Facebook. Enlightening read.
Anhad means continuous or nonstop. Sabad in Gurbani means the utterance of God. So Anhad Sabad means Divine Utterance which is still going on in the universe. It is not an utterance in the physical world where sound is produced by striking two material parts which dies as the energy that produced it is used up fighting the resistance of the media in which it travels. Anhad Sabad started in sunn, the materially void infinite space and is still going in sunn which encloses the whole universe: "Antar sunnun bahar sunnum tribhavan sunmusnum" p-943. It is this Sabad that created the universe:"Ek kwaa-ay te sab hoaa” p-1002" and it is with this Sabad that it is destroyed and created again:
"Utpat parlo sabday hovay. Sabday he phir opat hao-vay" p-117.
God is fully expressed in Anhad Sabad and it is also called Naam in Gurbani. Naam carries in it Divine Hukam/ Will, Divine Plan of creation, preservation and destruction, Divine Intelligence/ Wisdom/ Consciousness, Divine Laws and everything what God is. It created everything and is in everything:"Jeta keeta teta Naaon. Vin Naavain naheen ko thaaon” p-4. Naam or Anhad Sabad stays in every creation of God as Soul. So God extends into us as Sabad or Naam. Guru Nanak calls this Sabad as His Guru: “Sabad Guru surat dhun chela” p-943.
It is to this Sabad, Gurbani is advising us to connect to hear our Creator or Father and it is with this Sabad that we link with Naam which cleans our mind and we can connect with God Himself. Without this Sabad everybody is in spiritual darkness and Sabad enlightens the mind:
"Jeean andar jeeo Sabad hai jit Sauh milaava ho-ay.
Bin Sabday jag anher hai Sabdey pargat ho-ay." p-1250
This Sabad can be heard by taking our consciousness inside where it resides. The only way to do it is to silence our mind form its thoughts of the physical world or Maya. Naam Jpana is means to do that. This is done by cyclic utterance of Gurmantar and listen to it attentively till our surti is lost into the chant of it and we disconnect from our thoughts and land into sunn or mentally quiet state where Naam or Sabad reside. Even a short experience in that state is very relaxing and peaceful. If practiced in the company of experienced practitioners one will soon start hearing the Anhad Sabad in your ears (can be mistaken for tinnitus problem). The sounds generally heard are: ringing of bells, flute, chirping of birds in the morning, sounds of crickets in nature in the evening, rebab, sitar, drums, your own heart beat etc.
When these sounds are heard in sunn state it is direct link to Sabad or Naam. It is then that our mind start getting cleansed up of dirt of Maya and getting closer to higher spiritual stages. We are advised to hear these Sabads:
"Mun dhovo Sabad laago Har sio raho chit laa-ay." p-919
As the mind gets further cleansing by regular Japna, it will start hearing Sehaj Dhun- a high frequency sharp low volume note which goes on all the time. This happens when mind reaches third sunn or dasam duaar or doorway to enter divine mansion. At that point all other nine doors of the body are closed and the tenth one is reached where Anhad Sabad goes on day and night and is heard by following the Guru's advise:
"Nau dar thaakay dhavat raha-ay. Dasvain nij ghar vaasa paa-ay.
Othay Anhad Sabad vajay din raatee. Gurrnatee Sabad sunaavania." p-124
When time comes for union with God Anhad Sabad changes to Toor (sound of long horn played outside Gurdwaras and temples) "Binvant Nanak Gur charan laagay vaajay Anhad Tooray"p-917, followed by Naad, a loud low frequency humming sound before you are let into Sach Ghar or Divine Mansion: "Anahad Banee Naad vjaaia p-375". When mind makes entry into Sach Ghar, Anhad Sabad changes to Panch Shabad which welcomes the child of God to His House; who is the Emperor of the entire universe:
"Vaajay panch Shabad tit ghar subhaagay" p-917.
Mind then is fully awakened to its spiritual self by the Sabad.
"Dhun upjee Sabad jgaaia." p-1039
Free from bondage of Maya, mind sees nothing but Parkaash or Divine Light/ Jot and finally meets Beloved Lord:
"Pargati Jot milay Ram Piaray." p-375
Even Gurbani reaches the Gurus through Sabads. They translate the meaning of Sabad into local language for people to understand it and practice on it. God's language is not Punjabi but Sabads the meaning of which only the Gurmukhs understand it:
"Sabde upjay amrit bani Gurmukh aakh vkhaavania:"