BoB Output
Purpose
A BoB Output device provides an exit point for a signal. Each block of 8 outputs represents the analog outputs available on a BoB. Output devices consume DSP resources, but any outputs left unconnected will be automatically discarded when the system is compiled and will not consume DSP resources.
Output Levels
BoB outputs can operate at nominal output levels of +4dBu, -2dBu, -8dBu or -14dBu (depending on jumper settings inside the MM88xx or software setting for the MM8802). When a signal that reads +0dB on an RMS Meter is applied to an output device (assuming +0dB Output Level control setting) the signal output from the BoB will be either +4dBu, -2dBu, -8dBu or -14dBu depending on the BoB jumper or software settings.
BoB outputs are designed with +20dB of head-room. The output will not clip until a sinusoidal digital signal of +20dB is applied to the output device. The BoB output will produce a +24dBu, +18dBu, +12dBu, or +6dBu signal just prior to the onset of clipping. Since a maximum level of +32dB RMS can be represented in the digital domain, careful attention should be paid to the output Overload indicators.
Note: In MediaMatrix, internal clipping occurs at a Peak Level of +35dB Peak and output clipping occurs at +23dB Peak. RMS meters cannot be relied on accurately report clipping unless the crest factor of the signal is known, which is generally not the case with program material.
Controls
Level
Allows the output to be attenuated.
Mute
Mutes the output.
Overload
Indicates digital clipping at the output.
Note: The BoB is designed such that digital clipping occurs prior to analog clipping with a 600 ohm load. With normal loads and properly functioning hardware, you can be assured that the Overload indicator correctly reflects the quality of your output.
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