Hidiamond Cables, Do these reveal the live show?

I would like to add, since I have a complete loom of HD Cables (except for the Speaker cables) I believe the overall volume has increased.
That is, the settings on my Pass Labs Preamp are now lower than I used to use before the HD cables. I'm attributing this to the cleaner signal being transmitted.

Has anyone else noticed that the volume level has increased once the HD cables have been added?

Can owners/distributor answer: Is there a trial period/or alternatively any place in the Northeast USA to audition them? (I am in Connecticut)