Right now it's hard for me to imagine that anything at this price will touch the active NHT system identified by Shadorne (and alluded to by Bob). There is, however, an explanation. NHT is "shutting down" next week - not sure exactly what that means - but pledges continued service and support. The current prices appear to be a clearance "give-away", at app. 1/3 of the (very competetive) original prices.
Marty
Marty