Monacor img stage line direct injection box for an optimum signal transmission from musical instruments to a mixer or amplifier by using a transformer coupling interferences due to matching problems e g hum loops are prevented to a large extent input and output are galvanically isolated it featuring as 3 fold attenuation switch 0 20 40 db ground lift switch instrument feed through output wideband balancing transformer and robust metal housing transmission ratio is 10 1 50 kiloo