Electrical Panel Grounding

The earth does not possess some magical mystical power that sucks nasties from an audio system.

The main purpose for an electrical service connection to earth is for lightning protection.

You can fill your whole yard with driven ground rods if you like as long as they are all tied together and connect to one point to the main electrical service entrance neutral conductor.

NEC Code says the equipment grounding conductor for a sub panel shall installed in the same raceway, conduit, or cable assembly, as the feeder conductors feeding the sub panel.

The purpose of equipment grounding grounding conductor is provide a low resistance path for ground fault current to return to the source in the event of a ground fault event. THE EARTH IS NOT A LOW RESISTANCE PATH . When a sub panel is used the source is the main electrical service panel where the sub panel feeder equipment grounding conductor is connected to the service entrance neutral conductor. IF the ground fault current is greater than the breaker handle rating the branch circuit breaker in the sub panel will trip open breaking the ground fault circuit. IF the ground fault current leakage, due to a high resistance in the ground fault circuit, the circuit breaker in the sub panel just sees the ground fault current as connected load.

NEC code does allow an auxiliary grounding electrode to be connected to the equipment ground bar in a sub panel in addition to the feeder equipment grounding conductor.
IN ADDITION TO. NOT IN PLACE OF. I would not recommend it though. Lightning will travel through any path provided from the earth back to the earth. Especially a low resistance path.

Here is a great white paper for you to read.
https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf

wgutz,

A mix of diffusion and absorption is always a good thing!

High frequency hardness is a funny thing. While a lot of people focus on 1st  and 2nd reflections, this can also be treated by generally adding absorption in the room. In other words, some of the problems are due to direct reflections, but some are just doe to how slowly or quickly it takes signals to decay.

You can experiment cheaply with throw rugs/blankets and putting other soft, absorbent materials on the walls. If that takes you where you want to go, then you are going in the right direction.  Also, don't neglect the ceiling!

You may also experiment with toeing speakers outwards so you are not in the direct line of fire of the tweeter.

Eric - thanks fro the input.

Hair(;o

Jea - I read the article, and there is a bit fro me to learn. Thanks for your trouble to forward the link.

Jea - I read the article, and there is a bit fro me to learn. Thanks for your trouble to forward the link.

I should have mentioned you only need to read about the first 36 to 38 pages of the white paper.

I also should have asked you, in my last post, what country do you live in?  Earth ground is earth ground the world round but how it is accomplished/done/required varies. My comments are for the USA.

Here is a video on the subject of the use of an Auxiliary Grounding Electrode. It really serves no purpose and can cause damage to electronic equipment if used in the event of a nearby lightning storm.

https://www.youtube.com/watch?v=WlnFNTay-9Q

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