The black DB-CIJ3 Consumer Input Jacks - Mono from RDL is suitable for installations requiring the passive mixing of 2 unbalanced line level audio sources to feed a mono balanced (or unbalanced) audio line. The front panel features 2 gold-plated phono jacks and a single stereo 3.5mm mini-jack intended for mono consumer level sources. An input signal may be connected to either the phono jacks or to the mini-jack. The left and right signal inputs are combined and balanced through audio transformers configured to reject induced hum. A mono line-level output is provided on the rear-panel detachable terminal block for connection to a 10kΩ or higher input impedance line-level module or equipment input.