optional shield for the Crown Bus cable. Only the shield of the input cable should be connected. Shielded wire will reduce the total distance a Crown Bus loop can be run, but shielding may be neces- sary to reduce interference with certain kinds of audio cables. (Section 3.2)
Crown Bus Input/Output Connector
A4-pin removable barrier block plug is used for input and output connection to the Crown Bus. The pins are numbered backward from right to left (as you face the back panel of the unit). Pin 1 is input negative (–), pin 2 is input positive (+), pin 3 is output negative (–), and pin 4 is output positive (+). (Section 3.2)
Main Audio Outputs
A3-pin removable barrier block plug is used to connect to the main output of each channel. These outputs can also be connected to the stack inputs
(B) of other mixer/multiplexers to make a 12x2 (or larger) mixer. (Section 3.3.2)
Auxiliary Bus Audio Outputs
A3-pin removable barrier block plug is used to connect to the bus audio output of each channel. The bus outputs are isolated switchable outputs that can be turned on when needed by the IQ System. This allows many multiplexers to be tied together on the same bus without loading down the outputs. (Section 3.3.2)
Audio Inputs
A3-pin removable barrier block plug is used to connect to the input of each of the six audio inputs. The input gain control (E) and the input selector (K) of each one should be set to match the input signal level. These inputs can also be connected in parallel
with the inputs of other mixer/multiplexers to make a 6x4 (or larger) mixer. (Section 3.3.1)
Input Selector
Athree-position input selector accommodates dif- ferent input signal levels. The three settings are L for line-level input, M for mic-level input, and P for mic-level input with phantom power. The P setting supplies 44 volts DC for phantom-powered mics.
IQ Address
An 8-section DIP switch is used to set the IQ ad- dress of the unit. The unit must be given a unique IQ address so it can be independently controlled and monitored by a the system. It must also be set properly if the unit is to be used in a Crown Local Net. Two or more IQ components of the same type should NEVER have the same address on the same Crown Bus loop. (Section 3.2) Important: The IQ address should only be set with the power cord disconnected from the AC supply.
Baud Rate & Parity
A 6-section DIP switch is used to set the baud rate and parity for RS232/RS422 serial communication. This is only necessary when the DB25 connector (F) is used. Important: The baud rate should only be set with the power cord disconnected from the AC sup- ply.
Communication Standard
A communication standard switch which allows the unit to be configured for the RS232 or RS422 com- munications. (Sections 3.1³3.1.1) Important: The communication standard should only be set with the power cord disconnected from the AC supply.
