I have a 10' speaker cable that I'm wanting to splice one end and connect it directly to a speaker already in a 1-12 combo amp. I don't yet have an extention cab for my Z head, so I need to have a longer speaker cable than the one in the combo. Can I simply cut one end of my speaker cable and put some clips on there and then connect them to the speaker in the combo? If this is even possible which wire (inside the speaker cable) would be positive and which is negative? Hope my question isn't too confusing and thanks for your help and suggestions!