Hi, I have a 2005-vintage Raymarine active speaker that I would like to use for a new radio. Does anyone know how to connect the speaker to the new system? The speaker has no identifying labels or part number. The speaker circuit board is labelled K904C811-2. The speaker was used with a Ray215 radio and was connected to it with proprietary Raymarine cables. I no longer have the 215 radio. The 215 manual has a block diagram for the radio but does not have any information on wiring for the active speaker. The speaker has a cable with five wires connected to it: red, black, blue, brown, grey. As an active speaker it would need to be connected to a power supply and the output from the radio. So that's four connections. Which is which and why the 5th wire? Any suggestions on how to wire the speaker would be greatly appreciated. Thanks, Doug NT37-127  Annie O