That's correct. However, no one has what Ground Control provides, any more. We used to, back when we had poured ground planes underneath our point to point circuitry. But, those were not high resolution systems, nor low distortion systems. They just had this wonderful "ease" and naturalness, due to the completeness of their back wave.
Nowadays, you must have a fully differential high resolution system, to get that natural characteristic. Otherwise, the strip ground PCB format we are forced to, due to the enormous increase in air borne EMF, forces a low resolution to the signal pulled back through the various loads in our audio systems. This Ground Control item is just there to support retention of this back half of every wave form information that is otherwise lost to noise. And since this loss mechanism is true at almost all levels of audio equipment, Ground Control is just about your only help.
You can try it out on the cheap too. Take a 2 foot length of zip cord, split it into two pieces. Then strip about 2 inches of plastic from both of the ends of each piece. Make a loop and twist one end of each individual piece to the other end of that same piece, making two separate shorted loops of wire. You can flatten the loop out if you like.
Then attach the twisted ends of one loop to one speaker, ground / return or black lug connection point. Then do the same on the other side.
If you notice any change, across about a three hour time span, then your system will respond very well to the much more carefully tuned Ground Controls. Don't expect these loops to provide the holy grail, they have about a 90% chance of changing the sound quality. Could be better, could be worse. The Ground Controls are designed to be better.
Bud
