What size of banana plugs should I use? June 20, 2024 16:44 Updated 4mm Banana Plugs are recommended for use when connecting to our Amps / Stereo Receiver's output terminals. Related articles What’s included with the AXR85/100? What size of banana plugs should I use? When a subwoofer is connected, are speaker frequency ranges adjusted? Can I connect my Bluetooth Headphones to the AXR85/100 ?