I just purchased a GK MBE410. I use a GKMB200 head with only one speaker output. The cabinet is rated at 8 ohms. On the back panel of the cabinet, there is a speakon input and a 1/4" input. Are these inputs wired parralell so that an extension cabinet could be used and lower the load to 4 ohms? The GK website doesnt seem to have any info on this topic. Thanks for your help.