The preamp section employs a Class A tube buffer with a 30-ohm output impedance, so if 40 watts per channel isn't quite enough power, you can hook up a separate, more powerful amplifier. The preamp maintains a high level of detail while also taming harsh compressed digital music and allowing exceptional reproduction when listening to high resolution files. The Decco 2 has a USB input for your computer, 1 coax, and 1 optical input for other digital sources like Squeezebox, Apple TV or Airport Express, Sonos, and XM or Sirius tuners. It also has 2 analog inputs for a tape deck or phono preamp. We tried to think of everything you could possibly need on a piece like this. The Decco 2 should have you covered!