13–1
13 - Rear panel & connections
This section describes the rear panel connectors of
the TM-D4000.
All rear panel connections on the TM-D4000 are dig-
ital or control connections. The analog connections
are all provided on the top of the unit, and are
described in 12, “Front panel”.
13.1Analog inputs
These features (all on the horizontal top panel of the
TM-D4000) are provided for input channels 1
through 8. Some of these features also apply to the
two
ST IN
channels.
[47] MIC input (channels 1–8)
These XLR-type connectors provide inputs suitable
for balanced microphones, etc. to be connected to the
TM-D4000.
They are wired as follows: 1=ground, 2=hot, 3=cold.
With the
PAD [51]
off, the nominal input level for
these connectors is –50 dBu. Using the channel’s
TRIM
control, this can be adjusted between levels of
–67 dBu and –20 dBu.
With the
PAD
on, the nominal input level is –20 dBu.
The channel’s
TRIM
control can be used to adjust the
value between –41 dBu and +6–dBu.
The input impedance level is 2.4 k
Ω
.
Phantom power is available for these connectors. It is
turned on and off for two blocks of input channels
(1–4 and 5–8) using the
PHANTOM (+48V)
switches
[54]
.
WARNING
Connection of microphone cables and micro-
phones: to prevent hazard or damage, ensure
that only microphone cables and micro-
phones designed to the IEC 268-15A stan-
dard are connected.
Connexions des microphones et de leurs
câbles: pour éviter tout endommagement,
s’assurer de brancher uniquement des
microphones et des câbles de microphones
conçus selon la norme IEC 268-15A.
[48] LINE IN (BAL) input (channels 1–8)
These 1/4-inch balanced inputs are used to accept
analog line-level sources.
These are wired: tip=hot, ring=cold, sleeve=ground.
The nominal input level is +4 dBu, adjustable using
the
TRIM
control from between –39 dBu and +8 dBu.
No phantom power is supplied to these connectors.
[49] INSERT connector (channels 1–8)
These 1/4-inch TRS (tip-ring-sleeve) connectors are
used to provide an insert loop for the eight integral
analog inputs.
These are wired as follows: tip=send, ring=return,
sleeve=common ground.
The nominal signal level of both the send and return
is –2 dBu. The impedance of the send is 100
Ω
and
that of the return is 10 k
Ω
.
The insert send occurs post-
TRIM
[52]
. The insert
return is located immediately before the
O/L
indicator
[53]
.
[50] LINE switch (channels 1–8)
When this switch is pressed in, the channel’s input is
taken from the 1/4-inch balanced
LINE IN (BAL)
inputs
[48]
.
When this switch is in the out position, the channel’s
input is taken from the XLR-type balanced
MIC
con-
nector
[47]
.
[51] PAD switch (channels 1–8)
When this switch is pressed in, it provides 20 dB of
attenuation to any signals received at the
MIC
con-
nectors (
[47]
).
This is unconnected with the digital
PAD
control
provided as part of the
MODULE
screens (see 4.8,
“Pad and phase(
Φ
)”).
[52] TRIM control (channels 1–8 and ST
RTN 1 and 2)
On the eight input channels and the two stereo
inputs, this
TRIM
control is used to adjust the input
signal level by a range of 47 dB.
When it is turned fully counterclockwise, full trim is
applied. Turning the knob clockwise increases the
signal level fed to the channel’s A/D convertor.
[53] O/L indicator (channels 1–8)
This red LED lights when the post-
TRIM
, post-insert
return signal exceeds –3 dBFS.
This LED should light only on the very loudest part
of program material, since there is only 3 dB of head-
room remaining when it lights.
