Most HT receivers now have variable settings. On my Denon, the subwoofer channel has a variable upper cut off of 60-150hz. The center channel, mains, and surrounds each have 'big" or "small" settings. If they are set for "big" they get the full frequency range and if they are set to "small" they get only the frequency above the sub's cutoff setting.
For the actual DVD, a lot of this depends on the programme material. For discrete 6-ch recordings, I recall that sub gets <120Hz, with full range frequencies for all the rest. For the Dolby 2.0 soundtracks, the 6 channels are matrixed into left/right.
What happens in the DVD player depends on which output you use.
A) Digital or 5.1 analog output - select DD or DTS 5.1 soundtrack. Receiver does the decoding sends signals to output based on settings as described by John.
B) 2-ch analog output - must select Dolby 2.0 soundtrack or set player to downmix. Receiver decodes matrixed 5.1 encoded in the 2.0 signal. Left/right speakers get unchanged left/right inputs. Center is mixed L+R with 7kHz low pass filter at -3dB. Sub is mix L+R with 120Hz low pass filter. Both left and right surround is L-R unfiltered at +3dB. The differences in levels and frequency filtering is to lower the crosstalk between center and rear channels and to increase the directional separation between the 4 signals.
This is why discrete is superior to matrixed surround... the separation is there without giving up signal/noise ratio. In addition, for the 2.0 soundtracks, many engineers will intentionally filter lower frequencies to increase the directionality of sounds.
ensen.
What happens in the DVD player depends on which output you use.
A) Digital or 5.1 analog output - select DD or DTS 5.1 soundtrack. Receiver does the decoding sends signals to output based on settings as described by John.
B) 2-ch analog output - must select Dolby 2.0 soundtrack or set player to downmix. Receiver decodes matrixed 5.1 encoded in the 2.0 signal. Left/right speakers get unchanged left/right inputs. Center is mixed L+R with 7kHz low pass filter at -3dB. Sub is mix L+R with 120Hz low pass filter. Both left and right surround is L-R unfiltered at +3dB. The differences in levels and frequency filtering is to lower the crosstalk between center and rear channels and to increase the directional separation between the 4 signals.
This is why discrete is superior to matrixed surround... the separation is there without giving up signal/noise ratio. In addition, for the 2.0 soundtracks, many engineers will intentionally filter lower frequencies to increase the directionality of sounds.
ensen.BHG,
The allocation between channels depends alot on what type of movie it is and the intended feel. The center channel carries the bulk of the dialogue with the mains (fronts) getting some of the dialogue to give left/right orientation. The mains usually carry most of the music and the center and mains carry most of the effects (explosions, etc.) with the low frequency stuff going to the sub. Surrounds generally don't do much and are therefore often a smaller speaker. They come into play for things like footsteps from behind or bullets or cars whizzing past, but again it depends on the movie. The opening sequence of Saving Private Ryan or the big fight scenes in Braveheart put you right in the middle of the action, so there's alot of stuff coming out of the surrounds to give you a better feeling that you are there.
The allocation between channels depends alot on what type of movie it is and the intended feel. The center channel carries the bulk of the dialogue with the mains (fronts) getting some of the dialogue to give left/right orientation. The mains usually carry most of the music and the center and mains carry most of the effects (explosions, etc.) with the low frequency stuff going to the sub. Surrounds generally don't do much and are therefore often a smaller speaker. They come into play for things like footsteps from behind or bullets or cars whizzing past, but again it depends on the movie. The opening sequence of Saving Private Ryan or the big fight scenes in Braveheart put you right in the middle of the action, so there's alot of stuff coming out of the surrounds to give you a better feeling that you are there.
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