wrapped around it in four stripes around the plate, and I put one crystal on top.NO
put the copper tape ONLY on the external side of the application... IF you use it all along the electrical grid of your house dont use an H.D. use a big chunk of quartz like 100 gram at least... it will balance the sound especially if your system is already too warm... If your system is already too cold only the golden plate will be necessary....If you use the golden plate on a S.G. it is better with a small H.D. around 1 or 2 gram...But all along the electrical grid no quartz is necessary save for balancing a too warm audio system....
Try it on the main electrical appliance of your choice not on gear....Router,electrical box, conditioner, even you computer listen and keep it where the effect will be the more powerful and next try another one....