Lab.gruppen fp 1150q 사용자 가이드

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To connect an unbalanced input source, connect pins 1 and 3 in the cable’s XLR plug (ring and sleeve in a 
TRS plug). If you leave a pin disconnected, you will lose 6dB.  
A better method for using unbalanced sources is shown in figure 8. This is similar to the connection for 
balanced lines, but pin 3 is connected to the shield at the source end of the cable. The hum and noise 
rejection for the cable is equivalent to that of a balanced line. To minimize hum in the audio signal, use 
balanced inputs whenever possible. 

Speaker connections are made via the two Neutrik® NL4FC Speakon connectors. The Speakon 
connector is designed for high power speaker connections. It assures the correct polarity, it locks in place 
and prevents from shock hazard. 
They are wired in the following manner: 
The right jack, Channel A and B, has both channel A and B outputs, so it’s useful for bridging and bi-
amp operation (see bridged mono operation on page 

). The left Speakon, Channel C and D, carries 

both channel C and D outputs. 
 

Never connect either output terminal to ground or to some other output or input terminal. 
For normal four-channel operation, connect each speaker load across the output’s positive and negative 
terminals. Pay attention to speaker polarity; loudspeakers connected out of polarity degrade sound 
quality and may be damaged as a consequence. 
Keep the speaker cable leads as short as possible, and use a good quality stranded speaker cable. Do not 
use shielded leads, such as microphone or guitar cable. Remember that the speaker cable robs the power 
of the amplifiers in two ways: by increasing the load impedance, and by introducing resistive power 
losses.