I don’t think banana plugs will fit. These systems come with cables that have rca plugs on one end and bare conductors on the other end. You can insert the bare conductors while pressing on the button with the 6 dots shown in the linked picture provided by op.
kyle72ab t1_j5u08a3 wrote
Reply to comment by jobyone in Two speaker wires into a single plug (DIY Home Audio) by NoahTheCuck
I don’t think banana plugs will fit. These systems come with cables that have rca plugs on one end and bare conductors on the other end. You can insert the bare conductors while pressing on the button with the 6 dots shown in the linked picture provided by op.
This is also shown on page 13 of the installation manual https://assets.bose.com/content/dam/Bose_DAM/Web/consumer_electronics/global/products/speakers/ls28_series3/pdf/ig_en_lsiii.pdf