Only the best material on the market has been used to build this passive preamplifier
4 pairs of CMC USA gold plated red copper RCA , 1 pair of Vishay special "Z" foil Resisters ,1 extruded alum box ,1 Gold point switch, 1 Noble potentiometer w/ detent. ,2 solid Aluminum machined Knobs
All this passive pre amp does is to attenuate the volume and switches among different inputs. No power needed. This passive preamp use a 4-port, 3-position switch. All channels' ground signal is switched with the main signal. The grounds of each channel are isolated, therefore ground loops between equipments are eliminated. Also, the noise from one source cannot get into another.