RDL TX-J3 - Unbalanced Input Transformer (Unbalanced stereo inputs to summed balanced mono output)The TX J3 is the ideal choice in installations requiring the passive mixing of two unbalanced line level audio sources to feed a balanced (or unbalanced) audio output. The TX J3 is a complete unbalanced line level audio input module. The front panel features two gold plated phono jacks and a Mini jack input, intended for mono or stereo consumer level sources. When a Mini jack is plugged into the TX J3, the RCA input jacks are disabled. Inputs 1 and 2