Low-Gain Electronics - UTL-1
Product description "Low-Gain Electronics - UTL-1"
UTL1 is a passive box that can be used to translate voltages from 1/8" to banana format. - And vice versa. Signal conversions are not performed.
The UTL-1 is a passive 10 channel bi-directional banana jack to 1/8" (3.5mm) format jumbler.
Just connect the ground jack (black jack located on the side of the UTL-1) to your banana modular systems power supply ground jack and you're ready to go!