Antex Electronics SX-5e - Manual (Page 41)

36
SX-6 MIXER AND BLOCK DIAGRAM
Output Trim Control B determines the level of the output signal on
Line Out which corresponds to digital clipping. If the control is set
to +8, the maximum output signal level is +8 dBu. If the control is
set to +20, the maximum output signal level is +20dBu. Note that
these signal levels correspond to balanced outputs. If the outputs
are wired as unbalanced, see the table in the section on “Bal-
anced and Unbalanced Signals” to determine the actual output
signal level.
Play 1 and Play 2 Sliders, K, and L control the level of the files
being played back. Note that these sliders operate in the digital
domain. They amount to multiplication routines in the DSP which
take the signal level and multiply it by a scaling factor between 0
and 1. This is important to note because using these sliders as a
master volume control will degrade the signal to noise ratio. This
is because using these controls lowers the signal levels while
leaving the noise floor unchanged. These controls are intended to
mix 2 playback files together, or to fade a file up or down at the
beginning or end, not as a master volume control. Best signal to
noise ratio will be achieved by setting Sliders K or L to maximum
and controlling the volume using the master volume control on the
external amplifier or mixing board the Antex Card is connected to.
Set the Trim Control (B) to +8 rather than setting Sliders K or L
down if the output signal from the Antex card is too loud. One ex-
ception to setting both sliders at maximum is when playing 2 files
simultaneously. In this case, it may be necessary to lower the
sliders slightly to prevent clipping from occurring when peaks of
both files occur at the same time. Note that this is a subjective
concept; how much degradation of the signal to noise ratio is ac-
ceptable depends on the particular situation.
Slider M controls the level of the microphone feed-through to the
Line Out. This is intended for voice over applications, such as a
live DJ.