Sierra Video 507140 - Manual (Page 3)

Input Gain Adjustment:
JP3 controls the gain of the input stage for both the A Channel and the B Channel of the Board.
The gain is adjustable in 5 dB steps with a range from a maximum input signal level of +29 dBu to
a maximum input signal level of -1 dBu. 0 dBFs refers to the maximum digital signal level that
can be transmitted out of the Analog to Digital converter. These levels refer to the maximum
signal level. In order to avoid distortion it is recommended that the operating level used be
significantly lower to allow headroom for peak signals to be passed without overloading the
converter. In a typical application, the normal operating level should be set to be between 16 DB
and 24 DB below the maximum input signal level (depending on the type of audio input being
converted).
Not recommended - Amplifiers will clip Before 0 dBFs is reached
+29 dBu Max Input => 0 dBFs Output
+24 dBu Max Input => 0 dBFs Output
+19 dBu Max Input => 0 dBFs Output
+14 dBu Max Input => 0 dBFS Output
+9 dBu Max Input => 0 dBFs Output
+4 dBu Max Input => 0 dBFs Output
-1 dBu Max Input => 0 dBFs Output