Soundstream Technologies HRU. 2 - Manual (Page 13)

REMOTE TURN-ON
Connect the “Remote” line to the turn-on lead from the source unit. When
+12Volts received, the amplifier will turn on. Use 16 guage wire minimum.
SIGNAL CABLE
Use a high quality cable that will be easy to install and has minimal signal loss
to guarantee optimum performance.
SPEAKER CABLE
13
The Human Reign Unleashed amplifiers will accept up to 8 gauge speaker
cable. Use a high quality, flexible, multi-strand cable for best performance
and longevity.