Batboard

For information:
I have just received one of the white speakers and this is what I have found:

red--also yellow.......................................12V Supply
Black--also White.....................................Ground

Brown.(surrounded by shield).....................Audio high
Shield.......................................................Audio ground unbalanced

Green (marked SQ on cct board..................2K7(or 1K) up to Supply.

This has given successful interfacing to a portable radio and IT IS LOUD .

This is perfect as I have a modern dual band in the mobile and due to the recent changes in Deviation from 25kHz to 12,5 Khz this is going to help.

Anyone got a decent circuit for this unit to download as for my records.

I will be checking where it goes into clipping but will save that for a daytime test.

Regards Brad ZS5SWT /ZS5BG

Check this out:
http://www.n0ss.net/motorola_amp_spkr_mods_20060202.pd
I think it's what you're looking for.