Mark just replied to my question to clarify this within the Seaton Speaker Thread -
**The Official Seaton Sound Speaker Thread**
Per Mark...
The OUT program offers a 35Hz extension mode. I first did this for a customer using these as 2 channel speakers in a nice office, and we also listened to the speakers in this way when the guys at HT Shack gave them a listen as a straight 2 channel pair. 2 sealed 8" woofers per speaker do have practical output limitations. This works great for small room 2 channel use at fun levels, but nothing like the silliness that goes on at the east coast GTG's.

If pushed hard in the full-range mode with deep bass, eventually the woofer and amps will make some sounds of distress.