Yes. With one source component you can usually plug that into one receiver and then use another set of RCA type analog cables to pass that information to another receiver. Thus you have have the same information now present in both receivers.
To be safe I would only hook two sets of speakers to each receiver, thus you would be driving a total of four sets of speakers from one source component. The reason why I would limit each receiver to just two sets of speakers is because the impedance might drop to an unsafe level if you tried to drive more that two pairs of speakers with each amplifier. (That is assuming that each pair of speakers is 8 ohms.)
You might have to jury-rig those sub-woofers to play correctly in your system, you did...