Yamaha A-S series has neither pre out/main in jacks nor a tape monitor loop. So you won’t be able to use the equalizer with this amp. Links below to the similar A-S801:
https://forums.stevehoffman.tv/threads/new-yamaha-amp.853963/
I would sell your Bose and look for some speakers that don’t require an equalizer unless you want to get a tech to add the pre out/main in jacks (an expensive mod no doubt)