Very high quality LDR based preamp. This was made by Richard Becker of Aum Acoustics and was his personal preamp. If you go to the Aum Acoustics website it can be seen near the bottom of the page with the native american picture. Richard is a true perfectionist and this piece is no exception. Every wire, capacitor, connector, chassis etc, etc, were hand chosen for their audio purity. The power supply is a design by Richard that other manufacturers have copied. The basis of the pre is the Tortuga Audio LDR board. A fabulous piece in it's own right. When implemented by Richard it is sublime. Remote (apple) controls many features such as volume, balance, impedance matching, muting and more. Details of operation and features are available on the Tortuga Audio website. This is a close as you can get to a direct connection. Furutech IEC and RCA jacks show just how high a quality piece this is. OK, so why am I getting rid of it. Well I am older and I like my music with a golden glow. Tubes all the way with a rich warm palate. This pre is not that. If you favor speed PRAT, detail and a distinct clean clear sound then this is for you. Fell free to ask questions. 231 730-1841 Lowballers will be politely ignored.