The Art HeadAmp 4 Pro is a unique and extremely versatile 5 stereo channel headphone amplifier that packs in a huge array of additional features not often found on headphone pre-amps such as an XLR microphone input with phantom power for talkback to single or multiple channels talkback footswitch port four auxiliary input jacks and individual volume controls for each headphone channel to create an adept home studio headphone amplifier.