Japh said:There's a XLR and two 1/4 for connect a cab.
When I use the XLR, all is OK.
But when I use the 1/4, I lost the 18' speaker, only the 10' makes sound.
There is the same problem on the twice 1/4.
There should be 2 of each type. One set for input and one set for output (adding another cab inline).
Do NOT plug inputs to the outputs or two inputs from the amp. You will blow both units .
The XLR is the better of the 2 and transfers more signal than 1/4" connectors.