9
MIDI Setup
MIDI In Port
Select the MIDI In port via the dropdown menu. You must have
preconfigured the MIDI device via the Control Panel.
MIDI Out Port
Select the MIDI Out port via the dropdown menu. You must have
preconfigured the MIDI device via the Control Panel.
I/O Setup
Input Gain
Displays the Analog Input Gain Control dialog box. Eight virtual faders
determine the input gain setting ahead of the A/D converters. Two push
buttons set all inputs for +4dBu or -10dBV input levels.
Refer to the discussion on this topic below.
Output Gain
Displays the Analog Output Gain Control dialog box. Eight virtual faders
determine the output gain setting after the D/A converters. Two push
buttons set all outputs for +4dBu or -10dBV signal levels.
Refer to the discussion on this topic below.
Digital Output
Displays the Digital Output Channel Status dialog box. Select between
Configuration
AES and S/PDIF output format and the sample rate for the digital output.
Help
About
Version and copyright information for this application.
Gain and Headroom
The two gain control screens display virtual faders that adjust the amount of gain or attenuation
applied to input or output signals. Two push buttons allow presetting the gain to accommodate
n4dBu or –10dBV signals. At 0dB of gain, an input signal of –4dBu corresponds to a reading
of 0dBFS as read on the 8824’s meter. These readings are based on the use of sinewaves. The same gain
relationship applies at the output side of the 8824.
At the input side, the +4dBu button sets the input gain to –8dB, which translates to approximately
20dB of digital headroom (20dB below 0dBFS). Remember that the +4dBu number represents a
signal level read on an average responding indicator (i.e. VU meter), and the metering in the 8824
responds to peaks. If the +4dBu signal has a 20dB peak to average ratio, then this means that the signal
peaks correspond to +24dBu. If the program material allows, either due to your mixing style, com-
pression or limiting, or just the material itself, you may wish to reduce the amount of headroom to
place the signal as high as possible within the converter’s dynamic range window. Likewise, for espe-
cially dynamic signals, you may want to increase the amount of headroom allowed for these signals.
For –10dBV signals, the –10dBV button sets the input gain to +4dB, which again translates to
approximately 20 dB of dynamic range. The numbers may seem to be off until you recall that a
–10dBV signal is the same as a –7.8dBu signal (1V = 0dBV and 1V = +2.2dBu).
For both input and output, there is up to 31dB of gain or 95dB of attenuation available.
Note
The balanced line receiver can accept signals up to +25dBu. This is independent of any input
attenuation setting.
