The label says ps28. Looks like it's the back of the sub which the speakers connect to, and there's a separate DVD player. It does use an RCA to banana plug connectors, which could be hacked together from an RCA cable, speaker wire and banana clips.

Here the product support page https://www.bose.com/en_us/support/products/bose_home_theater_support/bose_5_speaker_home_theater_support/ls28_series3/manuals_downloads.html