Hotsause:
Congrats on a very nice system. The 20.1s will eventually be my last speakers. If properly set up and configured, your Sunfire sub will produce fast, tuneful and well defined bass. You need to keep it away from room boundaries; turn the volume down and adjust the phase control by tiny amounts. I have been able to obtain virtually seamless blending with my MG 3.5. But as you are aware it requires a lot of experimentation and effort
