Thanks for the responses guys! If anyone else has any input, I'd love to hear it.
Maybe I'm worrying over nothing. However, since I switched to the redmere cables just for the form factor (slim, flexible cable) I decided to see if I could find some super-slim passive cables. I know that Parts Express has them, but the shipping to Canada was expensive. I found some very inexpensive cables from a Canadian vendor that look to be very similar to the ones from PE. I'm going to try them out, just to put my mind at ease. I hate the idea that I might be shortening the lifespan of my TV or receiver by using active cables when passive ones would work just as well.
Gear: Speakers (Paradigm Reference Studio Series): 40 v4 (front L/R), CC-690 v4 (centre), 20 v4 (surround L/R). PSA XS30 (subwoofer).
Denon AVR-X4000, Emotiva XPA-5, Samsung PN64F8500 (64" plasma), DarbeeVision Darblet DVP5000, PS3, Sony BDP-S6200, Apple TV (3rd gen.), Harmony One, Sennheiser RS180