I bet he does...I mean I do!
Very nice! I find the Min 21 to sound best in the 140-150 Hz crossover range. Why do you feel you can't add two extra speakers? If you can't place them toward the ceiling on the top part of each wall, you can use the ceiling.
btw, you look cozy on your couch.
AVR-> Sub out-> Sub input (LFE or left channel)= sounds right
Make sure the sub is plugged in, turned on and the volume control is, at least, a third of the way up. If you haven't run YPAO, make sure the sub is on in the bass mgmt menu. If speakers are set to "Small", the sub should play on two-channel sources. If still no sound, try a different cable.