Quote:
Originally Posted by Mr69bungle
Please help I am trying to convert my 8 ohm MONO cab to a Stereo cab! 
I've checked here- Wiring a 4 X 12 Speaker cabinet for a diagram but as this is my first wiring experience and as i don't want to botch it up I thought I'd ask you're advice.
The mono setup is shown in the attached pic which is wired up red wire to A1 and black wire to B1 which from my thinking is Speakers in Series-Parallel?
So I'm just not sure where to connect the mono and stereo wires to get a 4 Speaker Switchable Stereo/Mono setup.
I'm thinking that maybe i have to connect the stereo wires to red C1 and black D1??? is that right or do i have to do something different???
Please help - thanks in advance Porl
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First thing you need to realize is that the ohm values written on the jackplate will be wrong, it is intended to be used with 16 ohm speakers, not 8. It will work electrically, but the cab will not be 4/16 ohms mono or 8 ohms stereo, it will be 2/8 ohms mono or 4 ohms stereo.
In order for the system to work correctly, each half of the cab needs to be wired in parallel. When the switch is set for mono, the internal circuitry in the jackplate connects both sides in series. When set for stereo, both sides are separated from each other.
That's the theory of how it works, I could look closer and help with the actual connections if you want.