iFi Micro iTube Tube Buffer and Preamp Class A tube buffer circuit puts the analogue back into your music With the 3D HolographicSound Wide setting, enjoy a sound field that is outside of the speakers with front to rear depth Digital Antidote Plus significantly reduces ringing and digital distortion Precision analog volume control is able to preserve the innermost resolution of the audio source Tri-brid stage offers input impedances of 1M ohm (Buffer) to 100k (Preamp) with the ability to drive professional 600 Ohm loads