I too own the Perspectives and had them upgraded to the graphene.
For me it was a great disappointment. I couldn't discern
an increase in SQ that was worth the cost. Most disappointing. I'm
a big believer in what good cables can add to one's system. Power cable
upgrades cannot be underestimated. There is no lack of discussion about cables.
I have made countless cable changes over the years.
Many have been game changing and jaw dropping at different price levels. I now have a full loom of the highest end Townshend cables. These will be my forever cables. I highly recommend Cutious Technologies
cable as well. There are so many great ones. Mad Scientist as well.
Many companies offer a generous audition/ return period. Cables, cables, cabes.