Batboard

Does anyone know what a HLN5574A is. It plugs into the VIP port on an systems 9000 control head, has some square electronic piece in heat shrink, and has a male and female speaker connection coming out of the heat shrink.

My local MSS gave me two of them to cabage the speaker connections off of.

Just wondering what the true use is...

Thanks

KD0EZQ

For what its worth...MOL description is "relay pod".

front/rear control head setup relay pod to disable the front speaker when the rear control head was selected if I'm not mistaken. Part number should be from a spectra but this may have been used on the syntor x9000 as well.