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jobyone t1_j5rznlh wrote

Each of those 5 RCA plugs on the receiver has two wires.

You need to build or buy five cables like these, such that each of those RCA plugs on the receiver splits out into two banana plugs and goes to one speaker.

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kyle72ab t1_j5u08a3 wrote

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

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jobyone t1_j5vhkd0 wrote

I don't think that manual is for the same system. The layout on the receiver is different, OP didn't mention DVD-playing, and the ports on the speakers in OP's photo really don't look like those spring-loaded bare wire connectors.

It is a distinct possibility that they're some sort of goofy proprietary Bose nonsense.

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