ART HeadAMP 4 Pro Five-Channel Headphone Amplifier HEASAMP4PRO
Amazon.com: Fifine Headphone Amplifier 4 Channels Metal Stereo Audio Amplifier,Mini Earphone Splitter with Power Adapter-4x Quarter Inch Balanced TRS Headphones Output and TRS Audio Input for Sound Mixer-N6 : Electronics
CANFORD HEADPHONE CUE AMPLIFIER Battery powered, 2 channel, 6.35mm jack out, 2x XLR in
ART HeadAmp4Pro 5-channel Desktop Headphone Amplifier | Sweetwater
Amazon.com: Headphone Amplifier, YGiTK 4 Channels Mono/Stereo Metal Stereo Headphone Amps-4x Quarter Inch and 8X Quarter Inch TRS Headphones Output and 1/4" & 1/8"& AV Audio Input(Including Audio Cable) : Electronics
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
HM2 Dual Channel Personal Monitor Headphone Amp | Miktek Audio