The HeadAmp4 offers 1/8th-inch as well as 1/4-inch inputs and outputs as well as lower noise – lower distortion and more output in a new custom extruded stackable metal case. Ideal for virtually any home or project studio – the ARTcessories HeadAmp4 easily adds additional headphone outputs to any mixer – computer audio interface – workstation – iPod – media player or laptop without creating any additional load on the existing headphone source. Individual level controls for the four headphone outs – 1/4-inch and now 1/8th-inch connections allow the HeadAmp4 to connect to virtually any source – and drive any headphone configuration including studio phones – in-ear monitors or custom ear pieces or any combination of the above.