Depends on whether your speakers have a dedicated or proprietary connection scheme. If not, almost any 5.1, 6.1 or 7.1 receiver will do assuming its wattage is consistent with what your speakers can handle. Do a Google search on how to choose a receiver or check a site like CNET.com.
If each speaker has an unconnected separate positive and negative terminal it is not dedicated. If it has one or two wires that connect all speakers together it is dedicated and requires certain receivers or adapters for connection.