Amplifier Cables & Connectors   

Different power amplifiers use a wide variety of connector types for both signal input and output. 
The input to the amplifier is a line level signal

The cable should be a shielded using a phone, phono, or XLR connector

The output of the amplifier is a high level signal capable of driving a loudspeaker. 

Speaker cable is a relatively heavy gauge wire which connects to the amplifier with XLR, banana, phono, phone, or screw connectors.