3
Figure 1. TX3 rear panel
Input connections.
As with other devices of its type, the TX3 controller is inserted in the audio chain
between the last link of audio source (mixing console, preamp, CD player, etc.) and
the power amplifiers.
The two audio inputs are the female 3 pin XLR connectors on the rear panel, marked
L for left and R for right. On each connector the signal is received between pins 2
and 3 and pin 1 is grounded.
Where the device connected at the input (i.e. console) and at the output (i.e.
amplifier) is balanced, there is no hot and cold pin to worry about : the TX3 is neutral
polarity with pin to pin connections (pin 1 to pin 1, pin 2 to pin 2, pin 3 to pin 3). Note
that the connection to pin 1 should be made using the cable shield.
Where a device with an unbalanced output (e.g. hi-fi, CD player or preamplifier) is
connected to the input of the TX3, the signal should be applied to either pin 2 or pin
3 of the input XLR, according to which pin is ‘hot’ or +ve on the amplifier connected
at the output. The unused signal pin (3 or 2 respectively) should then be linked to pin
1 for grounding (see Fig. 2).
Figure 2. Input connections from an unbalanced source
Output connections.
The audio outputs are the three 3 pin male XLR connectors on the rear panel. The
two (marked L for left and R for right) are the output channels for the main system,
while the third one (marked MONO SUB OUT) is for the optional sub-bass system.
On each of these connectors the signal is applied between pins 2 and 3 and pin 1 is
grounded.
