MOTU 828x 28x30 Audio Interface with ThunderTechnology - Manual (Page 14)

A B O U T T H E 8 2 8 X
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clock output at either 96 or 48 kHz. Half-rate
output is supported for all high sample rates (from
88.2 to 192 kHz).
Punch in/out
The quarter-inch Punch in/out jack accepts a
standard foot switch. When you push the foot
switch, the 828x triggers a programmable
keystroke on the computer keyboard. For example,
with MOTU’s Digital Performer audio sequencer
software, the foot switch triggers the 3 key on the
numeric keypad, which toggles recording in
Digital Performer. Therefore, pressing the foot
switch is the same as pressing the 3 key. The 828x
Control Panel software lets you program any
keystroke you wish.
Hybrid Thunderbolt/USB 2.0 connectivity
Thunderbolt is a new, high-performance, high-
bandwidth connectivity standard for Mac and
Windows computers. High-speed USB 2.0 is a
widely adopted standard for connecting peripheral
devices to personal computers.
To fully support both formats, your 828x audio
interface is equipped with both a Thunderbolt
connector and a high-speed USB 2.0 connector,
and you can use either port (one or the other) to
connect the 828x to your computer. This gives you
maximum flexibility and compatibility with
today’s ever-expanding universe of Mac and
Windows computers.
THE 828X FRONT PANEL
Mic/guitar inputs with preamps
The two mic/instrument inputs (front panel and
rear panel) are equipped with preamps and
“combo” XLR/TRS jacks, which accept XLR
microphone inputs or quarter-inch guitar/
instruments inputs. Individual 48 volt phantom
power and a 20 dB pad can be supplied
independently to each mic input. The Precision
Digital Trim™ knobs on the front panel for each
mic/instrument input provide up to 53 dB of boost
in precise 1 dB increments.
As explained in “Mic/guitar sends” on page 13, the
pre-amplified signal can be routed to external
outboard gear before being routed back into the
828x.
Mic/guitar input overload protection
Both mic/guitar inputs are equipped with
V-Limit™, a hardware limiter that helps prevent
digital clipping from overloaded input signals.
With V-Limit enabled, signals can go above zero
dB (with limiting applied) to as high as +12 dB
above zero with no distortion due to digital
clipping.
Additional or alternative protection can be applied
to the mic/guitar inputs by enabling the 828x’s Soft
Clip feature, which engages just before clipping
occurs and helps reduce perceptible distortion.
Headphone output and main volume control
The 828x front panel provides two independent
headphone jacks with independent volume knobs,
one of which also controls the XLR main outs on
the rear panel. Alternately, this MAIN VOL knob
can be programmed to control any combination of
outputs (analog or digital). For example, it can
control monitor output for an entire 5.1 or 7.1
surround mix.
Programmable backlit LCD display
Any 828x setting, including the powerful
CueMix FX on-board 16-bus mixer with effects,
can be accessed directly from the front panel using
the four rotary encoders and the 2x16 backlit LCD
display.
Metering section
The front panel of the 828x displays several banks
of input and output metering. The threshold for
these lights is approximately -42 dB. The four- and