You will need an amp/processor between the bluray player and the speakers. Sony makes some but, unfortunately, the 3ohm impedance of the speakers you have makes them generally incompatible with commonly available products. In addition, the unpowered 3ohm subwoofer is even more incompatible. These speakers were made to work with the amp in the DAV 280 and, frankly, are not really worthy of mainstream amps. My advice is to chuck the speakers along with the amp and either buy another matched HTIB system (like the Sony Dav 280) or buy a stand-alone amp and independent speakers of higher quality.
Nice bluray player.