No, the HDL300 system does not allow the use of third-party microphones. All microphones are built into the HDL300 system unit and are the only ones that are required for operation. If more microphone coverage is required in larger spaces, a second integrated microphone and speaker bar is added as part of a Dual HDL300 system. The input jack is not for connecting extra external microphones.
For supported configurations go to the Using the auxiliary ports article.
Last updated: June 23, 2020