Eleven Audio XIAUDIO 'Formula S' High Purity Headphone Amplifier (Open Box) Input Connectors:XLR featuring a quad (four) of

featuring a quad (four) of 6C45 tubes for the driver that pushes a quad (four) of 2A3 tubes for the power

9g (Bluetooth dongle)

there isn’t a cross-over or other electronic clutter in the signal path to endanger the driver’s musical performance

Google Hangouts or Cisco WebEx and Spark

Headphones Made in France

Eleven Audio XIAUDIO 'Formula S' High Purity Headphone Amplifier (Open Box) Input Connectors:XLR featuring a quad (four) ofA newcomer shows the world the true sound of music. Solid state dual mono amplifiers deliver stunning speed and clarity, with hard hitting bass and drums and beautifully smooth tube like decay to cymbals and string instruments, on up beyond perception, the Formula S amp is tuned for the highest resolution music and headphones. Impeccable balance, smooth and clear to the source, excellent bass definition, simply put the dedicated headphone amp every