There is a detailed method of how to conduct a level matched unsighted test here,
http://www.puriteaudio.co.uk/blog?page=2
To evaluate the grounding boxes will be far more straight forward, simply a metter of plugging and unplugging the box, the only important factor is that you can't know whether the box is connected or not.
keith.
http://www.puriteaudio.co.uk/blog?page=2
To evaluate the grounding boxes will be far more straight forward, simply a metter of plugging and unplugging the box, the only important factor is that you can't know whether the box is connected or not.
keith.