There should be four binding posts on the back of your amp - two for speaker "A" red + black -.
two for speaker "B" red + black -
On the front of the amp set the speaker selector to EITHER "A" or "B" and connect to whichever you set it at.I suspect you are using the wrong binding posts.The posts may be lined up vertically OR horizontally. It's easy to get one on correctly and the other on the incorrect post.
two for speaker "B" red + black -
On the front of the amp set the speaker selector to EITHER "A" or "B" and connect to whichever you set it at.I suspect you are using the wrong binding posts.The posts may be lined up vertically OR horizontally. It's easy to get one on correctly and the other on the incorrect post.