L2, your Sony receiver, which incidentally is accurately rated at 90 watts per channel(legal regulations require it)and is equal in "musicality"(when music is playing)to the Marantz or any other receiver, should have no trouble continuing to power your setup as in the past unless a defect has developed or(more likely)a wire somewhere is causing a short. Recheck and redo all your external wiring and if that's okay, take one speaker at a time out of service to see if it has an internal short which is causing the shutdown.
