I think it may be something else opening up in your system.
The wire Speltz uses has very little dielectric on them and the dielectric is what the burn in is about.
Dielectric is the insulation around the wire and acts like a capacitor. Storing energy and releasing it. The burn in attempts to allow the signal to pass without the effects of the dielectric but never really does.
I know about these things because I also manufacture a cable very similar.
If you have 300 hrs on your entire system, maybe it's something other than the cables opening up.
The wire Speltz uses has very little dielectric on them and the dielectric is what the burn in is about.
Dielectric is the insulation around the wire and acts like a capacitor. Storing energy and releasing it. The burn in attempts to allow the signal to pass without the effects of the dielectric but never really does.
I know about these things because I also manufacture a cable very similar.
If you have 300 hrs on your entire system, maybe it's something other than the cables opening up.