Kilowattski, the heftiest current on an Aleph 2 is 3A to 3.5A...a good quality AWG#14 will do. Two terminal block pad connections for gauge 14 wires are provided for this drive current. Just route it away from your input signal. You also can slim down your usual 17" wide monoblocks if you mount the PCBs parallel to your flatback heatsinks.