I guess the best question for me is why pass through? And if the energy cant pass through, what are the 4 clips for?
The general answer is only use the speaker wire connections if you don't have the RCA style connection on your receiver/amplifier.
As far as the no passthrough on the energy sub, maybe somebody else has a better idea of how/why you would use that. I think some receivers have dedicated speaker wire outputs for a sub.