Split Meld is a box that connects two TS (mono) connections to one TRS (stereo) connection. It is helpful in stereo setups when one stereo element uses a TRS connection and another stereo element uses two TS connections. Signals remain separate and unaffected by each other, only the connection type is changed.
For more information, see the Split Meld manual available here.
Split Meld is entirely passive and requires no power supply.
Art elements and layout of Split Meld by Seth McCarroll.