If your wires are equal in length, you can probably chalk it up to the speaker placement and how reflected energy affects your perception. Why is Valhalla 2 different from Heimdal or Red Dawn? It does have lower resistance than all of the other models, so you are getting a bit more free flow of current to the speakers. This would have no effect on the room reflections, so that leaves only psychological explanations, like expectation bias.
Cable Quandary
Since listening to Nordost Valhalla 2 speaker cable, I am very pleased to notice that music coming from both speakers are balanced meaning sound played on both speakers are equal to each other. This has not been my experience with other cables. I have stayed with Nordost since 1999 and have used their various speaker cables. They started out balanced but while breaking in started to tilt to one side. My system has changed over time, but this issue stayed with me. Not this time with Valhalla’s. Cam someone explain why or am I crazy to think that. Speakers have changed over time but have stayed at one place all the time. I hope I am clear about the issue. Thanks.