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user manual
TA-880
TA-880 user manual
Page 80
The amplifiers are designed to operate with fully balanced equipment. Ground loops or loss
of performance may be experienced if connected to unbalanced sources. If it is unavoidable,
however, the following wiring convention should be used.
Pin 1 Screen - connect to chassis of the unbalanced
equipment, or left disconnected at the unbalanced end
Pin 2 signal hot
Pin 3 Signal cold
Polarity
In accordance with international standards, T series amplifiers are supplied with Pin 2 hot (+),
so a positive (+V) input gives a positive (+V) output from the positive (+) output terminals.
Input Impedance
Each amplifier channel has an input impedance of 10kΩ, seen between pins 2 & 3 of the XLR.
When used with the LMS-D6 Loudspeaker Management System, distribution amplifiers are
not required when a large number of T-25 or T-45 amplifier inputs are driven in parallel.
Gain and Sensitivity Settings
Gain settings are changed internally by simple jumper links. Two rows of pins marked - GAIN
A and GAIN B - are situated on the input PCB (PCB701). A jumper link sets the gain and the
settings are as follows:
Link 1 & 2 Gives 32dB gain
Link 3 & 4 Gives 26dB gain
Link 2 & 3 Gives approx 37.5dB gain
NOTE: Factory setting is normally link 1 & 2 = 32dB gain.