Low-Gain Electronics - UTL-2
Product description "Low-Gain Electronics - UTL-2"
UTL-2 is a passive box that can be used to translate voltages from 1/4" to banana format. - And vice versa. Signal conversions are not performed.
The UTL-2 is a passive 10 channel bi-directional Banana Jack to 1/4" (6.35mm) format jumbler.
Just connect the ground jack (black jack located on the side of the UTL-2) to your banana modular systems power supply ground jack and you're ready to go!