Quick reference: 828x front panel – MOTU 828x 28x30 Audio Interface with ThunderTechnology User Manual
Page 7
Quick Ref
e
re
nc
e:
828x F
ron
t P
a
nel
1.
Th
ese XLR/TRS c
ombo jacks acc
ept either a mic cable or a
quar
te
r-inch guitar cable
. B
oth the lo
w-impedanc
e XLR
jack and the high-impedanc
e
TRS jack ar
e equipped with
a pr
eamp (so don
’t c
onnec
t a +4 line le
ve
l XLR cable!)
2.
Th
e upper phone jack is a standar
d quar
te
r-inch st
er
eo
headphone jack.
Its output is har
d-wir
ed t
o mirr
or the
XLR main outs on the r
ear panel.
F
rom the fac
tor
y, the
MAIN
VO
L knob ne
xt
to
it c
on
tr
ols the main outs and this
jack,
but MAIN
VO
L can be pr
co
mbina
tion of outputs
. S
ee “
P
ush the knob onc
e t
o view the
curr
en
t v
olume setting in the L
CD displa
y;
push it again
to
mut
e the monit
or gr
oup;
push a thir
d time t
o r
eturn t
o
the pr
evious v
olume
. Not
e:
if the Monit
or Gr
oup is
pr
ogr
ammed t
o not include the main outs
, the MAIN
VO
L
knob will no longer c
on
tr
ol the v
olume of this phone
jack,
either
.
3.
Th
ese t
w
o trim knobs pr
ovide appr
ox
ima
tely 53 dB of
gain for the XLR mic input and the hi-
Z
TRS guitar/instr
u-
men
t input.
B
oth inputs ha
ve
pr
eamps
, so y
ou can plug
just about an
ything in
to
them:
a micr
ophone
, a guitar
, a
syn
th — but don
’t plug in a +4 signal her
e (due t
o the
pr
eamps):
use a r
ear-panel
TRS input inst
ead
. U
se the
trim knob and the
“MIC”
input lev
el met
ers o
ver in the
met
ering sec
tion t
o calibr
at
e the input signal le
ve
l. T
he
met
ers c
ov
er both the
TRS and XLR input
. T
hese mic
inputs ar
e also equipped with the 828x’
s V-Limit™
har
dw
ar
e limit
er
, which pr
ovides an additional +12 dB
of headr
oom abo
dist
or
tion.
S
ee “Mic/guitar inputs met
U
se the r
ear panel
sends t
o r
out
e these inputs t
o y
our fa
vo
rit
e outboar
d
gear
. U
se an
y r
ear-panel input as a r
eturn.
4.
Th
is sec
tion c
on
tr
ols the 828x
’s built-in C
ueMix
FX mix
er
and effec
ts.
T
her
e ar
e eigh
t st
er
eo mix busses:
each bus
mix
es all inputs (or an
y subset y
ou wish) t
o a st
er
eo
output of y
our choic
e.
Yo
u can apply EQ,
c
ompr
ession,
and r
ev
erb t
o inputs
, outputs and mix busses
. T
he four
knobs t
o the left of the L
CD c
orr
espond dir
ec
tly t
o the
four labeled sec
tions of the L
CD
. U
se the CHANNEL k
nob
to
choose the input
, output or mix y
ou wish t
o edit.
P
ush
it t
o swit
ch among inputs
, outputs and busses
, then turn
it t
o choose the desir
ed channel or bus
. U
se the P
AGE
,
PA
RAM and
VA
LU
E knobs t
o acc
ess the mix settings f
or
the chosen channel.
5.
Th
is bank of f
our-segmen
t input met
ers is for the 8
analog
TRS input jacks on the r
ear panel.
6.
Fo
ur-segmen
t st
er
eo met
ering for S/PDIF input
.
7.
Th
is sec
tion pr
ovides t
w
o t
en-segmen
t met
ers for the
tw
o fr
on
t-panel mic/guitar inputs
. T
he met
ers sho
w
input le
ve
ls fr
om -42 t
o -1 in the first c
olumn of LEDs
,
plus an additional r
ange in a sec
ond c
olumn fr
om z
er
o t
o
+12 dB (including clip).
B
oth inputs ar
e equipped with
V-Limit™,
a har
dw
ar
e limit
er
. W
ith the limit
er turned
off
, signals tha
t hit z
er
o or abo
ve
will clip (a har
d digital
clip).
Ho
w
ev
er
, with
V-Limit turned on,
signals can go as
high as +12 dB abo
ve
ze
ro
with no digital clipping
. If the
signal then goes abo
ve
+12 dB
, it will clip
, ev
en with
V-Limit engaged
.
8.
Fi
ve
-segmen
t met
ering for the main outs
. U
se the MAIN
VO
L knob t
o c
on
tr
ol output le
ve
l.
9.
Th
ese ligh
ts indica
te
the global sample r
at
e a
t which the
828x is oper
at
ing
. U
se the MO
TU A
udio S
etup soft
w
ar
e t
o
set the sample r
at
e or t
o choose an e
xt
ernal clock sour
ce
,
fr
om which the sample r
at
e will be der
iv
ed
. W
hen no
clock signal is curr
en
tly pr
esen
t, one of these LEDs
flashes r
apidly
.
10.
Thunderbolt and USB ar
e “
plug-and-pla
y”
pr
ot
oc
ols.
Th
at
means tha
t y
ou can turn off the 828x and turn it back on
without r
estar
ting y
our c
omput
er
.
11.
W
hen the 828x is r
esolving t
o SMPTE time c
ode
, the
LO
CK/T
ACH LED glo
w
s when lock
up has been achie
ved
.
Th
e ADA
T and MIDI LEDs blink when ther
e is optical
audio or MIDI ac
tivit
y, r
espec
tiv
ely
.
12.
These r
ound LEDs indica
te
signal pr
esenc
e on the 8 r
ear-
panel
TRS analog and SPDIF outputs
. T
heir thr
eshold is
ar
ound -42 dB
. T
hey do not indica
te
clipping in an
y w
ay
;
use y
our host audio soft
w
ar
e lev
el met
ers t
o calibr
at
e
output le
ve
ls.
13.
The multi-purpose back
lit L
CD sho
w
s syst
em settings or
Cu
eMix
FX settings
, depending on which k
nobs y
ou turn.
Th
e labels abo
ve
and belo
w the L
CD r
efer t
o the four
digital r
otar
y enc
oders t
o the left of the L
CD
. T
hese knobs
let y
ou acc
ess and pr
ogr
am all settings in the 828x.
14.
Push the CHANNEL k
nob r
epea
tedly t
o c
ycle among the
four main sec
tions of the mix
er
: mix busses
, inputs
,
outputs and the r
ev
erb module
. P
ush the P
AR
AM knob t
o
en
te
r the SETUP menu
, which pr
ovides global 828x
settings
, such as the global sample r
at
e,
et
c.
15.
U
se these butt
ons t
o t
oggle the -20 dB pad and 48V
phan
to
m po
w
er for each mic input
. T
he P
recision Digital
Tr
im™ knob pr
ovides 53 dB of gain.
16.
Fr
om the fac
tor
y, the PHONES jack is a discr
et
e output
(when the 828x is oper
at
ing a
t 44.1/48 kHz),
but it can
mirr
or an
y other output pair (digital or analog).
F
or
ex
ample
, a
t 88.2/96 kHz,
it defaults t
o mirr
oring the
main outs.
As the primar
y phone jack,
it has its o
w
n
dedica
te
d v
olume knob (t
o its righ
t).
10
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