Operating Manual - PROTEA SYSTEM II 4.24D Distribution / System Processor
6
5. REAR PANEL FEATURES
5.1 Input Connections
Balanced input signals are connected to the 4.24D using the included
"Euro Block" connector. A flat blade screwdriver is required to connect a stripped
wire lead to the loose connector, which is then inserted into the rear panel Euro
Block receptacle. It is important that both (+) and (-) inputs are properly termi-
nated or signal loss and noise may result. In other words, if an unbalanced input
signal is used, connect the signal to the (+) input, and connect the ground wire to
both the (-) and ground connection.
A Note About Input Signal Levels:
There are no input trim adjustments on the Protea 4.24D, therefore all the processing (including gain) is done
in the digital domain. As a consequence of this design philosophy, it is important to feed the Protea processor with the
proper nominal signal level to achieve good signal to noise performance as well as headroom before clipping. The
Protea 4.24D is designed to clip at signal levels above +20dBu = 7.75Vrms which places the noise floor lower than -
90dBu. The optimum input signal level which should be fed into the Protea processor is 0dBu = .775Vrms. This input
level will allow 20dB of headroom while giving a nominal signal that is >90dB above the noise floor.
5.2 Output Connections
Like the inputs, output connections are made using the included "Euro Block" connector. All outputs are
electronically balanced, but may be wired balanced or unbalanced. Use (+) and ground for single ended unbalanced
output connections.
5.3 RS-232 Dataport
The 4.24D has two parallel RS-232 dataports, one on the front panel and
one on the back, for connecting to a computer for software control. See section
6.3 for details on connecting to a computer.
*Connect (-) to G if Unbalanced Input is Used.
*Outputs Can Be Used Balanced or Unbalanced. Use (+) and G For Unbalanc ed
Inputs A-D
Outputs 1-4
Outputs 5-8
(-) (+) G G (+) (-)
A
B
(-) (+) G G (+) (-)
C
D
(-) (+) G G (+) (-)
1
2
(-) (+) G G (+) (-)
3
4
(-) (+) G G (+) (-)
5
6
(-) (+)
7
D-Sub 9 Pin Female
RS-232 Pin-Out
1
2
3
4
5
9 8 7 6
Pin # RS-232 DCE Name
1
2
3
4
5
6
7
8
9
Not Connected
Transmitted Data
Received Data
Data Terminal Ready (tied to pin 6)
Ground
Data Set Ready (tied to pin 4)
Not Connected
Not Connected
Not Connected
O
8
Euroblock
Connector
System
