I infer from your references to Sumiko that you are using a REL. What you describe is the standard setup for them but not what the majority of sub manufacturers recommend. One issue is that your main speakers still run full range; that limits their power handling and can give higher distortion than otherwise. It also puts a larger burden on the amps that feed them.
That said, you need to use the Audyssey in order to EQ all the channels in that setup. If you used a more standard sub configuration, with BM in the pre/pro and the sub fed via a line-level output, you could use a dedicated sub EQ for it. The Velodyne SMS-1, the R-DES, the BFD come to mind but there are others.
Overall though, you will need to recalibrate the Audyssey every time you make a change in room acoustics and/or equipment and/or set-up and configuration.
Kal
That said, you need to use the Audyssey in order to EQ all the channels in that setup. If you used a more standard sub configuration, with BM in the pre/pro and the sub fed via a line-level output, you could use a dedicated sub EQ for it. The Velodyne SMS-1, the R-DES, the BFD come to mind but there are others.
Overall though, you will need to recalibrate the Audyssey every time you make a change in room acoustics and/or equipment and/or set-up and configuration.
Kal