Palmer BRIDGE 4A+ Active 4-Channels Line Isolation DI Box - 19"The BRIDGE 4A+ is a multifunctional device: each of the four channels can be used independently as an active DI box, a line isolation box, or a booster. The input combo socket accepts unbalanced and balanced signals. The outputs are designed as two transformer balanced XLR sockets per channel (one on the front and one on the rear). The galvanic isolation via transformer eliminates hum loops, and the ground lift switch can also be used to eliminate