The JAM Jar
Output wires connect to the output jack negative/black to pin 2 and positive/red to pin 3 remember to tin the pins first.
These wires then solder to your speakers
1 No connection
2 Black wire - Negative
3 Red wire + Positive
From the other side of the output jack solder the final negative/black to pin 2 and positive/red to pin 3 remembering to tin the pins first.