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Onyx 400F Features
Front Panel
There are ten channels in the Onyx 400F. Channels 1-4
share the same features with the exception that channels
1 and 2 have a high-impedance 1/4" input jack on the
front panel for connecting electric instruments directly
to the preamp without a direct box. Channels 5-8 are
line-level inputs and have no front panel controls.
Channels 9-10 are the stereo digital S/PDIF inputs.
1. Power Switch
This is self-explanatory. When the POWER switch is
turned ON (up), power is supplied to the Onyx 400F.
2. CLOCK SOURCE Indicators
These three LEDs indicate the clock source currently
selected for the Onyx 400F. The selection is made in the
Onyx 400F Console (on the PC or Mac).
Note: Since one of the clock source indicators is always
lit when the power is on, it serves as a "power on" indi-
cator as well.
The three options are:
INT: This is the default selection. The Onyx 400F
runs on its own internal, extremely accurate, low-
jitter clock. Select INT when using the 400F as the
master clock in a system of digital devices, or if no
other clock source is available.
WORD: The Onyx 400F uses the clock signal that
appears at the WORD CLOCK IN [18] connection
on the rear panel. Select WORD when you want the
400F to be a slave in a system of digital devices.
S/PDIF: The Onyx 400F uses the clock signal em-
bedded in the S/PDIF digital input [21] signal.
Tip: It's always best to use the highest quality clock as
the master. Experimenting with different clock
sources, and using your ears, is the best way to
determine which clock source to use.
12
ONYX 400F
STUDIO RECORDING PREAMP WITH 192kHz FIREWIRE I/O
ON
CLOCK SOURCE
INT
WORD S/PDIF
3. FireWire Indicator
This LED illuminates when a valid FireWire connec-
tion is made between the Onyx 400F and a computer.
4. MIDI Indicators
These two LEDs fl ash whenever MIDI data appears at
the MIDI IN and MIDI OUT connections.
5. CONTROL ROOM Level
Use this knob to adjust the signal level at the CR Out
jacks on the rear panel. It adjusts the signal for both the
left and right Control Room outputs, ranging from off
(∞) to maximum gain (MAX).
Connect the CR outputs directly to the inputs of a pair
of powered studio monitors. No mixer required!
6. PHONES 1 and 2 Level
These two knobs adjust the signal level at the
PHONES Out jacks [7] on the front panel. They range
from off (∞) to maximum gain (MAX).
Having independent level control for each headphone
output means that in an overdub situation, for example,
the musician and the engineer can each adjust their
own headphone volume to taste.
7. PHONES 1 and 2 Outputs
This is where you plug in your stereo headphones.
These are 1/4" TRS stereo jacks. The same signal ap-
pears at both PHONE jacks, but each has its own indi-
vidual level control [6]. The same signal is also routed
to the CONTROL ROOM outputs [17].
CNTRL RM
MIDI
IN
OUT
O
O
MAX
MAX
O O
PHONES
1
2
MAX
O O
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