I live in Pakistan and the earth supplied by our utility is useless. All houses have there own grounding sunk about 12-18 feet into the earth into a copper plate with bare copper wire coming out of the ground and providing earthing to the main distribution of the house from where this is run throughout the house.
Not that that much different from what we have here in the US. Here we basically have a bare minimum of 2 earth connections called grounding electrodes that connect to the main incoming electrical service entrance neutral conductor. The minimum depth of the electrodes must be a minimum of 8ft for a ground rod and 10ft minimum earth covered metal water pipe if provided. One other grounding electrode that is required if the house has concrete footings is a concrete encased grounding electrode. (Started sometime around 2008)
No matter how many grounding electrodes there are they all must connect to one point. The electrical service entrance neutral conductor.
Your electrical code apparently requires the grounding electrode to be installed deeper into the earth. I would imagine because your soil moisture content is less and you may not get as much rain/moisture as we do here in the US.
I have simply taken another connection point that is sunk further into the ground and which is not shared by the rest of the house.
That does nothing for the sound quality of an audio system. If anything it just adds noise. If you want added lightning protection, by installing an additional grounding electrode, connect it to the main grounding electrode system of your electrical service.
Again the mother earth does not possess some magical mystical power that sucks nasties from an audio system.
If you want a direct mains power feed for your audio equipment I would suggest you install a dedicated branch circuit from the electrical panel to an electrical receptacle outlet for your audio equipment. The new branch circuit equipment grounding conductor is also part of the branch circuit. It should connect to ground bus in the electrical panel the brach circuit is fed from.
I do have a lightning rod connected to the main earthing system.
That is a no, no, here in the US. Lightning rods do not connect to the electrical service grounding system. Lightning rods have their own driven ground rod/s. Going from memory they must not be driven near ground rods/electrodes that are connected to the electrical service entrance neutral for obvious reasons.
At the moment what I have done is takes the separate earth and connected it to the earth wire that is supplying the various resecptales that are being used in my set up.
That sounds like an Auxiliary Grounding Electrode to me. I would not recommend one.
I have also taken another wire and connected it to a copper bus bar to which the analogue equipment is grounded through individual wires such as the earth wire attached to the RCA wire plug the earth plug at the bottom of the table as well as the earth on the phono stage. All the 3 pin sockets are also grounded in the sockets as they would be normally.
Does absolutely nothing for the sound quality of your audio system. If anything it adds noise. Which you have now.
Did you try what I suggested in an earlier post. Disconnect your "dedicated earth" connection from your audio system then listen to it.
Here is a video for you to watch. It basically relates to what you have now.
https://www.youtube.com/watch?v=YuDqXFvRv94
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