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 When a subwoofer is connected, are speaker frequency ranges adjusted? How do I assign radio stations as presets in the StreamMagic app? What’s included with the AXR85/100? Can I connect banana plugs to the AXR85/100? How do I use banana plugs?