@lynn_olson
Bam!
Thank you! One sub added. (Old one kept just in case) and will get another. Much better sound experience right away. The pre/system sounded aok with no discernible difference after putting cable into Pre’ Amp’s RCA output. Thought I could do as much but waited untill one of the birth fathers chimed in.
Sub set around 50Hertz. Will mess wi/ setting up/down.
Another round of thanks.