Just upgraded my IC and Speaker cables with Harmonix GP & SLC series. I have also ordered XDC Power cables for my entire equipment incl. Summit Power cables. This will be my last investment I hope on the cables. I could not imagine the difference what my system is capable of. All these years I had tried MIT Terminator 2 , MIT Proline , DH Labs Silver Revelation and Q-10, I had to them them all out of my windows now!!! I thank Cleon for recommending and convincing me to go for the Harmonix cables. I was about to order MIT Magnum Series but changed my mind due to the fact that these cables are not suited for Valve Amplifiers which I am planning to add in future. I have done only 90 odd hours of burn-in against 400-500 hours. These cable what the manufacturer claims are the tuned cables and only of its kind in the world. All these days, I thought that I had a bad room acoustics but after replacing with these cables, everything seems to have fallen in the right place – specially the bass becomes tighter and the space increased in the mid range and highs becomes smooth as a silk. Since I do not have any dealers of Harmonix in the region, the designer Mr Kiuchi of Harmonix referred to a Mr. Cecil Tang –Audio-Note in Singapore. I now realized that he has a terrific patience of handling a probable buyer like me. He is very prompt and quick in his replies and always kept up with his delivery schedule. I fully recommend anyone who want to deal with him.