Sound Devices 633 - Manual (Page 22)

Input Fader
The Input Fader is the primary control used while mixing and it affects the level of the Input signal
routed to all post-fader destinations. Use the Input Fader to make fine gain adjustments. The fader
can be attenuated from off (full counter-clockwise position), -36.8 dB to +16 dB (full clockwise posi-
tion) relative to the set Trim level. To optimize gain structure for the best performance, operate input
faders at or near the 0 dB (unity gain) position.
Inputs 1, 2, and 3 use the large fader knobs. Inputs 4, 5, and 6 use the pop-up fader knobs. To power
down Input 4, 5, or 6, turn the respective pop-up fader control fully counter-clockwise until it clicks.
Phantom Power
Phantom power is enabled on an input during input type selection ( See “Input Types”, page 14 ) ( See
“Input Settings Screen”, page 11 ).
Phantom powering is a fixed DC voltage of either 12 or 48 Volts. This voltage is resistively applied
to pin 2 and pin 3 of an input’s XLR-3F connector, relative to pin 1. In this configuration, there is no
voltage difference between signal pins 2 and pin 3.
The phantom voltage is selectable between 12 and 48 Volts from the Setup Menu item
INPUTS > Phantom Voltage. The selected voltage level applies to all inputs with phantom power
enabled. The factory default phantom power voltage is 48 V.
Digital Inputs
The 633 accepts AES3 (AES/EBU) balanced, AES42 (Mode 1) balanced, and AES3 unbalanced digital
signals on the Input 1 XLR-3F connector. The 633 auto-detects between AES3 balanced and AES3
unbalanced digital signals and adjusts accordingly. Digital input gain is controlled by rotating the
Select Encoder from the input’s Input Settings Screen.
Never attach unbalanced connections to an input set for AES42. This can result in damage to the hard-
ware.
To use a digital input:
1. Enter the Input Settings Screen for Input 1. (Slide Input Select switch left or right depending
on the value of Setup Menu option INPUTS > PFL Toggle Mode) ( See “PFL Toggle Mode”, page
25 )
2. Press the Headphone Encoder to display the list of available input sources.
3. Turn the Headphone Encoder to select AES3 or AES42
4. Press the Headphone Encoder to confirm the selection.
633 User Guide and Technical Information
16
v. 1.02 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
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