MACKIE DX8 - Manual (Page 16)

DX8 – 16
TRIM
Use the TRIM control to adjust the signal level
at the BUS A and B inputs. Typically, this control
would be set to the center detent position (unity
gain). However, it can be adjusted up or down by
20 dB to achieve a balance between the signal at
the BUS A and B inputs, and the signal on the
internal A and B buses.
Using the RECORD Output
The A and B output signals are provided at the
RECORD output jacks, which are industry standard
unbalanced RCA connectors. Connect these to the
Tape Input jacks on a tape deck or other recording
device to record the mix at the BUS A and B outputs.
OUTPUTS A and B
These outputs provide a balanced line-level
signal. Connect these outputs to the inputs of a
power amplifier.
Using the REMOTE BUS Connection
Connect one or up to nine remote controls to the
REMOTE BUS connection. Each remote control has
an 8-position DIP switch that must be set to a
unique ID. When the DX8 is first turned on, it polls
the REMOTE BUS and identifies the remote
controls connected to it by each unique ID.
Many of the predefined functions have two ID
addresses assigned to it to accommodate situations
where two remote controls are required to control
the same function on a single DX8.
There are two remote control versions available:
Selection Remote (4-Button/4-LED)
This remote device is designed to select
functions such as preset selection, mute, and force-
on/off. Each of the four buttons controls a single
function and its associated LED displays the
current state of the function.
Refer to Appendix C for a list of the predefined
functions available for the Selection Remote Control.
Level Remote (2-Button/12-LED)
This remote device can control a level,
preselected via the 8-position DIP switch, and
display the selected level on the LED meter. The
predefined functions include Input 1-8 level,
OUTPUT A or B MASTER level, OUTPUT A and B
Group level, and Group 1-8 level. Note that the
remote control indicates the gain setting of the
channel, and not the signal level in real time.
Refer to Appendix D for a list of the predefined
functions available for the Level Remote Control.
Connecting One or More Remote Controls
The remote control devices are connected to
the DX8 using a 3-wire half-duplex interface with
+24V DC phantom power. The REMOTE BUS
connection can provide power for up to nine
remotes. Provision is made to connect local power to
the remote controls if required in certain applications.
The maximum distance between the DX8 and
the remotes varies, depending on the type of cable
selected and the type of remote controls used. As a
general rule, using 22 gauge wire (at 0.014
Ω/ft. and
34 pF/ft), one remote can be up to 3000 feet away,
five remotes can be up to 2500 feet away, and eight
remotes can be up to 500 feet away before trans-
mission losses become a factor (see the instructions
with the remote control for more information).
Using the LOGIC I/O
The DX8 has 10 general-purpose logic inputs and
10 general-purpose logic outputs. The inputs are
active low with internal pull-up resistors. The
outputs are active low open-collectors with internal
pull-up resistors. With the inputs or outputs
unconnected or inactive, the logic voltage level is
high (+5V). The active state is defined as voltage
low (0V or ground).
The logic functions assigned to each individual
logic input and output are configured using the DX8-
PC application. In addition, each logic input and
output can be assigned a descriptive name (up to
32 characters) for easier identification within the
PC application.
Note: Logic I/O functions are set from the PC only.