Hi. I await Yamaha response but maybe it's a generic question?
I will output
x8 mic channels via ADAT @ 24 bit/44.1 from Focusrite ISA828 to Yamaha AW2400 multi
track recorder set to record at 16 bit/44.1. (X4 mic's will go direct into recorder) (I
need the track count so cannot set recorder to 24 bit). Will my audio be compromised?
Will the recorder simply see an audio stream regardless of the differing bit rates?
It's happening in 2 days so I am keen to sort it. thanks in advance.
Technically, the recorder will simply lop-off the bottom eight bits of audio data coming
from the converters. In theory, that means the dithering is lost and will result in
quantisation distortion products -- possibly audible as increasing distortion as reverb
tails die away etc.
However, in a live recording situation the chances are that
the ambient noise floor will be well above the nominal -96dBFS noise floor of the 16 bit
recording tracks, and that elevated noise floor will essentially act as the dithering
So technically, it's a bad thing to do. Practically, you'll probably
get away with it.
-------------------- Technical Editor, Sound On Sound
Note to self: a post in 'another place' (alt.pro.audio-live) mentioned finding nothing
about changing bit depth in ISA828 manual. Jogged my memory....i installed a digital card
into my unit and on the bit of paper that shows how to fit (it)...is a list of various
user options. 24/20/16 bit depth can be chosen by moving a jumper. I lost the paper but
focusrite promptly sent me a download. nothing wasted here though...i understand
dithering more than i did before. so thank you.