If you feed an R9 an line level wav file shouldn't the files be identical gain wise when viewed in an editor...?
Okay, lets try it:
I created following files using Audacity [File format 24 Bit / 48 kHz WAV]:
A) 1 kHz Sine, volume setting 1 (highest possible Volume in Audacity)
B) 1 kHz Sine as A, then decreased by adding amplification of -3 dB
C) 1 kHz Sine as A, then decreased by adding amplification of -6 dB
D) 1 kHz Sine as A, then decreased by adding amplification of -12 dB
Then I transferred these files to my R-09. All settings on the R-09 and test equipment were exactly the same as in my first post.
First step after that was controlling the level meter on the R-09's display by playing back the files:
A) showed a clipped signal
B) showed -3 dB
C) showed -6 dB
D) showed -12 dB
After that The output level on the "calibrated" [98] PHONES output was measured in dB:
A) +0,5 dBu
B) -2,4 dBu
C) -5,4 dBu
D) -11,4 dBu
---> with input Level [18] using LINE IN jack we are as close as possible to the one and only existing "unity gain" setting, because by recording 1 kHz / 775 mV at [18] and playing back with [98] we get nearly the same level on all equipment (R-09 meters, millivoltmeter and audio software) as we get it with created files (within 0,6 dB... at least!).