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The PLI 01 Line Isolation Box from Palmer is a mono isolation transformer which features 1/4" TRS jack sockets at both ends for balanced and unbalanced signals. The box can be used to eliminate ground loops that cause hum as well as convert signals from unbalanced to balanced. The box will also minimize noise in your car's hi-fi system when used to isolate power boosters. Uses for the Line Isolation Box include guitar rack systems where multiple signal processors and preamplifiers are combined.