has anybody ever tried using the main L/R pre-outs to directly connect on an active subwoofer while the L/R mains are set to large and the subwoofer is set to "off"? would this give better bass than running speaker wires to bridge the subwoofer between the speaker level output and the L/R mains?

currently, my sub is connected to the sub-pre out of the rxvr and it is set to "on".