The Radio Information Board

Hi all,
Im looking for info on which pinout should be used to connect an external speaker to the control head on a Kenwood tk-730 VHF.

Hope someone can help

thanks
steve

pin 5 and 6 are speaker out of control head.
short pins 9 and 12 on the 15 pin connector on the rear of the radio unit.
mod

thanks for the information
I will try it today.
anyone know how to connect this radio to a siren system speaker & external speaker inside the vehicle . For unknown reasons, the rescue squad installed a speaker box for all the radios above the console.
they want all the radios connected to this speaker box.
steve

The option button can be programmed to switch from inside speaker to outside speaker(which connects at the rear 15 pn connection)
no way to have both speakers on at the same time without an internal modification.