Slight error. The model is ca50b15 and I can't find a manual on google. Can't upload a photo but the front panel is as follows;
2 jacks, input 1 , input 2,
Volume knobs, volume1 ,volume2,
Equalisation knobs , low, middle1, middle2, high,
then 3 jacks, external speaker, headphones, line output.
The jack saying external speaker is the one I am querying.