I ended up purchasing the SMS-1/LFM-1c combo. So far I have only received the LFM-1c. It is a worthwhile addition. The sound is much more full. Now I need to figure out a way on how to balance the sub with the rest of the system. As far as I can tell the RR2150 does not generate any test tones.
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra