John Blankenship Posted February 16, 2014 Report Share Posted February 16, 2014 Decibels do not refer to a specific quantity, they specify a relative value. e.g. If I say I'll give you twice as many marbles as your neighbor has, you need to know how many your neighbor has for that to mean anything. Of course, the takeaway is that when you're dealing with someone who has lost their marbles, decibels mean nothing. Quote Link to comment Share on other sites More sharing options...
imphy Posted February 18, 2014 Author Report Share Posted February 18, 2014 Thanks John, I am aware that dB is relative but in all digital software I use, on the Sound Devices 702 and other recorders the peak before clipping occurs is referenced as 0dB so I am sure there is a good reason why SD have changed the meters on the 633 to use 20dB as the reference before clipping. I was simply curious why the change to such a standard. Quote Link to comment Share on other sites More sharing options...
studiomprd Posted February 18, 2014 Report Share Posted February 18, 2014 (edited) imphy: " the peak before clipping occurs is referenced as 0dB " well, actually 0dBFS is when all the bits are 1's... as dB are a ratio, you need to pay attention to what they are ratios of... the manual will be helpful... Edited February 18, 2014 by studiomprd Quote Link to comment Share on other sites More sharing options...
zernicke Posted February 18, 2014 Report Share Posted February 18, 2014 Since the 633 and 664 are from the mixer line, their metering matches the 442, 302 and 552. 0dBu is equivalent to -20dBFS [from the SD forum website] Quote Link to comment Share on other sites More sharing options...
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