Joemeek MC2 Stereo Compressor - Manual (Page 7)

13
Tr
oubleshooting
continued...
6) T
oo much noise
• Is the ‘Input Gain’
control too high (eg: the input signal is too small)?
• Is the noise already present in the input signal? (T
ry removing the input).
•
Is
the
‘Make
Up
Gain’
control
too
high
(eg:
when
lots
of
compression
is
being used)? •
Tr
y
us
in
g
th
e
G
R
H
ol
d
fu
nc
tio
n
to
c
om
pe
ns
at
e
fo
r
co
m
pr
es
so
r
ac
ce
nt
ua
te
d
no
is
e.
7) Sounds distorted • Is the ‘Input Gain’
control too high?
• When using the compressor
, is the Release control set too low?
•
Is
the
GR
Hold
on
with
the
control
set
too
low?
Tr
oubleshooting
Technical Specification
Input impedance
Line: 20kohm
Pre-amp overall gain
-6dB to +15dB
Common mode rejection
70dB
Equivalent input noise
-95dBu (unweighted)
Distortion
0.001% (below Compressor threshold)
Frequency response
10Hz to 70kHz (-3dB)
Maximum input before clipping
+19.5dBu
Headroom before clipping
+19.5dBu
Compression threshold
-6dBu to +22dBu (variable)
Compression ratio
1:1 to 10:1 (variable)
Compressor attack time
1 msec to 100 msec (adpative)
Compressor release time
0.1 sec to 3 sec (adaptive)
GR Hold rhreshold
-10dBu to -50dBu (variable)
Stereo Width range
Mono / stereo / wide stereo (variable)
GR Meter
8 segment bargraph
VU Meter
8 segment bargraph
Nominal output levels
+4dBu/-10dBv
Output impedance
75ohm
Output Level switch
12dB attenuation
Noise Floor
-95dBu (typical, with 0dB Input and Make Up gain)
Power supply
12V ac mains adaptor
Power consumption
12W
Mechanical
220W x 44H x 180D (overall)
W
eight
1 kilo
12
Using
the
Insert
Point
This
unbalanced
“Send
and
Return”
jack
allows
you
to
patch
other
pieces
of
equipment,
such
as
a
graphic
equalizer
into
the
compressor
’s
control
circuitry
, for “frequency conscious” compression.
If
you
boost
certain
frequencies
with
an
external
equalizer
,
those
frequen
-
cies
are
going
to
cause
the
compressor
to
respond
more,
ie:
squash
the
program
material
more.
If
you
cut
certain
frequencies,
the
compressor
will
respond
less
to
those
frequencies.
Uses
for
this
can
be
either
creative
or
corrective. Imagine
you
are
trying
to
even
out
the
vocals
in
a
mix,
but
the
mix
is
bassheavy with the result that
each bass note squashes the vocals.
A
mod
-
est
amount
of
bass-cut
on
the
external
equalizer
will
make
the
compressor
respond less to the bass, allowing it to do its job of controlling the vocals. On
the
other
hand,
you
might
want
to
have
a
vocal
or
a
drum
beat
deliber
-
ately
“duck”
the
rest
of
the
mix
for
special
ef
fect.
T
une
the
external
equaliz
er
to
the
frequencies
of
the
instrument
you
want
to
emphasize,
then
adjust
the
‘COMPRESS’
control
so
that
the
compressor
only
operates
when
those
frequencies are present. Note that none of this external equalization is audible as such.
Tr
oubleshooting
1) No Power (no lights work) • Is the power supply plugged in (both ends)? • Is the mains power on? • Has a mains fuse blown? 2) The Inputs don’t work • Is the source connected to the jack inputs on the back of the unit? • Is the ‘Input Gain’
control turned up?
3) The compressor doesn’t work • Is the ‘Comp’
switch in (LED on)?
• Is the ‘Compress’
control turned up enough?
• Is there enough signal, as set by the ‘Input Gain’
control, to drive the
compressor? • Is the ‘Slope’
control turned up enough?
4) T
oo little or too much compression
•
T
urn the ‘Input Gain’
control up or down respectively
, to adjust the
signal level to the compressor
.
•
T
urn the ‘Slope control up or down respectively
.
5)
The Stereo Width doesn’t work
• Is the ‘ON’
switch in (LED on)?
• Is only one input connected? • Is the programme material mono?
mc2 manual.indd 14-15 3/20/06 12:51:42 PM