- Feb 28, 2023
Pro Logic I does what I tell it to. I turn the pan pot and set f/b and the image goes wherever I turn the pot.
nah, it just goes to "somewhere there".
in prologic I you have a gap of 150 degrees between left front and surround, and since direction is recognized by filtering and runtime difference between the ears it is quite hard to place a sound source at 75 degrees when there is no speaker somewhere near.
if the - basically only 3 - speaker of those systems at least had equal distances between the speakers... but even then quad setups would offer more precision when it comes to direction.
Remember that all of this digital sound stuff did not exist for the general public when Dolby Surround debuted in Star Wars.
most digital filters are much older than that, it was probably more a matter of cost what they have chosen.
but of course the digital implementations for phase shifting were quite bad in the 80ies, too, and beeing affordable for as many households as possible was the aim of these products.
I will always disagree with those that claim that sounds can't be properly panned in quad. There are many discussions about this in other threads but if the speakers are placed close enough together around the listener then PWM works just fine.
sure, if you compare it against other setups then you need to be at least so fair and use equal distances and consider only the center to be the hotspot.
you are still at 90 degrees then, which is a lot.
however, one should not only compare systems against each other in a professional studio. in a livingroom with lots of room reflections having 4 speakers compared to more than 4 is even worse.
given that eventually one´s main target is a binaural 2-channel downmix (and/or immersive formats are listened to using earphones, which is technically the same), you should also do a comparison on that domain.
to my ears, the difference between 4 and 10 speakers is huge.
maybe i should better move that to one of the threads you mentioned and add some sound examples. my encoder question has nothing do with that.
(it should be added that i am experimenting with synthesis with that, i.e. i modulate positions of complex soundfields at signal rate. no mixing desk or DAW can do anything of that. i first have to get used to think in traditional mixing terms when it comes to surround.)
With modern surround they always talk about speaker placement in terms of degrees. In the seventies speaker placement was never described in that way. Many different speaker arrangements were once suggested, none right or wrong. No hard and fast rules (I hate rules) it was always suggested to arrange the speakers dependant on your particular listening room and your own personal preference. It would seem that today you require a special home theatre room with the proper Dolby approved speaker placement!
having ceiling speakers is not a bad idea at all, and dolby´s suggestion to use 7.4.1. at a minimum might be reasoned, but i tend to ignore this modern development, too.
there is still enough to explore in a 2-dimensional world.