The MightyMic Pack from AmpRidge allows you to directly connect the headphone jack output on the MightyMic L (sold separately) into a powered speaker or mixer. It is designed to work with applications such as GarageBand, and uses the microphone input setting to monitor the sound and listen while recording.
In addition, the MightyMic Pack also allows you to use your phone as a pre-amp to directly provide a signal to the powered speakers 1/4" input jack.
The package includes one 20' 1/8" extension cable and one 1/8" TRS stereo mini-plug to a 1/4" mono plug adapter cable. The adapter cable mixes the left and right channels together (sums) rather than shorting them in the same way as a standard cable.