NRG Custom Power Cables ?

I have purchased a power cable and speaker cables for bi amp system. First off NRG had numerous correspondence with me to ensure he was building the proper cable I was looking for. This included pictures of my connection points and terminals. I am running a Lindemann Source 20 with 2 Lindemann Power 55 amps. PMC TB1 signature speakers and a JBL Sub. I wanted to bi amp my system so needed new cables to do it. First impression when they arrived was the build quality. Superb attention to detail and finishing. I was replacing Audioquest cables and there was no comparison. Sound quality was better but was that due to bi amping or the cables? Regardless I am very happy both with the product and the service.