I have a multiple emulator setup with several original controllers for around 10 different systems. I tried usb adapters and it turned out to be quite cumbersome.
Operating System: Windows 7 x64
Processor/CPU: i5 4690k @ 3.5 GHz
Video Card/GPU: Nvidia GeForce GTX 970
Memory/RAM: 8 gb G Skill ripjaws
Dolphin Revision Currently Using: always the latest build
Processor/CPU: i5 4690k @ 3.5 GHz
Video Card/GPU: Nvidia GeForce GTX 970
Memory/RAM: 8 gb G Skill ripjaws
Dolphin Revision Currently Using: always the latest build