Topic: Input impedance of the analog inputs of the ADI-2 PRO FS
I'm considering using my ADI2PROFS in my home audio system to digitize the signal from the RECORD output of my tube preamp.
The tube preamp spec. states that loads lower than 10k are not acceptable for this output, and I note that the ADI2PRO input resistance spec is 9k unbalanced and 18k balanced.
The preamp produces a single ended phono output, and I am concerned as to whether the preamp and the ADI2PRO are incompatible without the addition of a padding resistor.
Two questions. Firstly, can I use the balanced input in conjunction with a suitable phono to XLR or TRS adapter so that the perceived load impedance is large enough?
Secondly, does the input impedance remain the same as the input level control is adjusted?
The maximum output level from the preamp is about +11dBu.