I don't know... Isn't that kind of thinking a bit mid 90s? The dynamic range in today's lossless Blu-ray soundtracks is equal in all channels. Take Oblivion, for example: At close to reference volume, cheap plastic Yamaha speakers would bottom out, or distort majorly in the rear. Even if the filter is set to 80Hz, or so. That movie has an incredible soundtrack, with very active rear channels. As active as the front L/R I would say.