You will get better sonic results with PS Audio Power Plant. It is more effective & of more universal value than the NBS box. The Black Signature is part of older NBS cable designs. They add too much coloration to the system. They have an overall dark sound which might the beneficial only to certain bright brittle sounding systems. I am not sure what your reason is for buying either product. I personally had best results with Perfectionist Audio's PAC Idos or the Super Idos. They are extremely effective in dealing with a system's electrical noise without the negative side effects of power conditioners or colorations introduced by many of high end A/C cords. They even cost less than any competing product. I have seen at Cable Co. site; www.fatwyre.com under accessories and power conditoners. PAC products are not conditioners!
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