Peace, mercy, and blessings of God be upon you. Preamp, takes two inputs (CD player + DAC, for example) and connects them to a speaker with the ability to switch between the two inputs. A10K potentiometer, passive preamp. Note: Does not work with some types of RCA cables from my experience. It works with RCA to RCA, but when I tried it with RCA to 3.5 it didn't work for some reason, maybe the problem is with my cable. Anyway. Price: 50 SAR.