Amazon.com: 1/8" aux Input Mixing 2 in 4 Channel Way Out Headset Box Headphone Amplifier 3.5mm Mixer 1/8 inch Stereo Audio Amp with Ultra-Compact Portable Mini Jack 3.5 Splitter hup for Studio
Bluerigger 1x2 Toslink Digital Fiber Optic Audio Splitter 1 Male Input