Hi
I do not have a 7.1 sound system so can't actually test this, also as
may become apparent I don't know much about sound :-)
I would be grateful if someone could correct/confirm the following.
If I were to mix down a digital 7ch to mono I have to reduce by 1/7
amplitude to prevent clipping, so one channel will be -16.9dBfs.
If I play the track over one speaker the volume difference between one
and all channels will be 16.9dB.
If I were to measure the volume at listening position (assuming anechoic
and equal speaker distance) with a real 7 speaker setup then the volume
difference, because the speakers are not close, would add up using power
not amplitude so the difference heard/measured between 1 and 7 at full
power would only be 8.45dB, so there is quite a large dynamic range
discrepency?
The real reason for this question is more to do with simulation than
real life, so perhaps that will make a difference - if the speakers are
infinitely far producing planewaves and a soundfield is at listening
position would that change anything for what levels the virtual omni
would "hear".
TIA
Andy.
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