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Hiya Crazy Bee
Hey - you know your system better than I and I would not wish to sound presumptious! I gleaned from your post that all your speakers were set to small, my apologies if I was wrong. However, you say that the crossovers are set to prevent low frequency info from reaching your speakers - of course! That is what a crossover id designed to do but low frequency info does not have any significant impact below 120Hz so I mantain that you have your crossovers set significantly higher than many would recommend. Also, if your sub sounds better at 100Hz then that's great but again this is quite high if your mains go down to 70 and will mean that you will be getting a rather homogenous sound. The whole point of being able to set crossovers in HT is so that we can ensure that our sub cuts in as our other speakers bottom out - but if it sound good then leave it be.
As for getting the sub to reproduce the low frequencies of course this should result in a cleaner sound as it is often best not to have speakers working at their limits but again your set up is quite, 'unique' shall we say and this, I believe, is the cause of the distortion you hear. Using sepakers that are, let us be frank, inadequate for reproducing the frequencies and SPL levels found in Dts is bound to cause problems.
Finally, you claim that human hearing is greatly diminished when listening from the rear, including direction and frequency response - where on earth did you read this? I would not say that hearing is greatly diminished at all - it is more difficult for the human ear to distinguish various sounds but our ears do not have a frequency cut off depending upon whether the sound is at our back or side!! The human ear has a natural frequency response much like a speaker but we can be aware of sounds beyond our level of hearing - this is why many maintain that vinyl sounds better than CD - vinyl has a higher frequency response that extends to the limits of human hearing, unlike CD which has a much lower response - we may not be conscious of hearing these frequencies but they do make a difference - as do bass frequencies below 10Hz. Also, I would disagree that the human ear cannot distuingish directionality from the rear - this is simply not the case at all. Also, you might want to try placing your rear speakers at the side of the listening position, rather than behind it - this can have a very beneficial effect. My advice would be to get some speakers that are more suitable for a HT system - speakers designed for Pro-Logic will be woefully inadequate for the newer digital systems.
Cheers
T
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