I am looking for the best way to hook up my AX120a sub to my amp for best quality. It seems the only way I can use it is use the line level jacks even though I have the High level inputs and outputs. Any help would be appreciated. Can send pictures of sub if this would help.
Thanks in advance ..Mel.

In my experience with a different brand of sub, the line level inputs sounded the best. The speaker level inputs sounded delayed (I know, highly unlikely) to me. Besides, why take down the power being sent to the sub and then boost it back up again?

use the line level