Your new A/V receiver’s front panel seems friendly enough with its softly winking LEDs and ergonomic layout of buttons and knobs. But turn that sucker around, and you’ll find a menacing thicket of jacks, terminals, and other connectors — some familiar, some not. Never fear: Whatever connector you might come across on an A/V component is pictured in living color and explained right here in these PDFs.

PDF: Audio Analog
PDF: Audio Digital
PDF: Audio Speaker
PDF: Video
PDF: Multipurpose