Sansui 717 - "System A and B" Help

Dear Sir,

My cables are bi-wired so I have a total of 8 speaker ends(i.e., 4 plus and 4 minus) comming out of 1 pair of speakers. Correspondingly, there are total of 8 binding posts on the integrated amp. to which each of speaker wire end is connected.

Questions: Is it generally recommended to connect each speaker end to each corresponding binding post(that is, filling all of System A and B binding posts by speaker cables)thereby using "A+B" amp. setting? Or is it better to leave either system A or B speaker out(that is, connecting 2 wire ends into 1 binding post)thereby setting the amp. mode to either A or B - but not both A and B?

I am currently using the former setting (i.e., using both A and B) since it sounds great that way. But I am worried if that would damage either/both my speakers or/and amp for I have hitherto understood that the usage of both A and B simultaneously is restricted upon the situation where there are "2 pairs" of speakers connected to 1 amplifier.

In fact, when I switch the speaker out mode to "A" alone - while utilizing both "A and B" systems - I am only able to hear very high frequency sound without the presence of low; on the other hand, if I am to set the output mode to "B" alone - again, while using both A and B systems - only the "low" frequency sound is audible from my speakers.

Am I doing something wrong here? Sounds quite confusing yet I am more confused than the questions being posed here... Any suggestion is welcome!
regards,

Sincerely,