Installation project using T-2 by HiFiMe and balanced outputs

[ysound]

Hi,
I'm working on an installation project using several T-2 STA510A. My hardware outputs are all balanced (TRS; Profire 2626), and I'm not sure how to connect them to the amplifier's input. The amp input is a 2.54mm connector for Left Right channel and GND.
I'm going to feed 2 mono balanced channels (2xTRS) into the amplifier: connect the hot(+ve) of each channel to the R and L inputs of the amplifier. Then, I guess I need to bridge the ground and cold (-ve) of each output, and send them together (4 wires total) to the GND input of the amplifier. Is that correct? Or can I just ignore the cold(-ve) of the output and use a 2-wire cables: hot and ground only. One hot(+ve) to the R, one hot(+ve) to the left, and then bridge the two grounds and connect them to the GND of the amplifier.
I guess the question is about balanced and unbalanced use.
Many thanks,
ysound