10" self powered sub-woofers.....

@ artemus_5  thanks for the response.  The 9i is listed at -6 db at 29 hz.  That's really not the direction I want to go and prefer a product more advanced on the phone control technology side.
@ oldhvymec   thanks for the response.  There is one in every crowd, isn't there?!
@ m-db  Thanks for the response.  I am aware they are alive and well and producing and selling new product.  What I don't see is any advances in phone app control tech.  The NHT C doesn't even have a damping setting (movie, music) so beyond the really nice NHT black piano lacquer finish I think I can do considerable better. . I made a conscious decision to upgrade both rooms low frequency response rather than try and get something repaired in Miami.  Boxing and shipping a 15 year old sub for repairs didn't seem to make much sense to me either and I have already given it to a friend who likes to try to do repairs like this would most likely entail..  It's already been picked up......I kept the screw in spikes and power cord.I like NHT gear.... I have a bedroom system which has their original video tower 5.1 set with their 12 sub which I bought after two Velodyne's failed right after their warranty expired. I think 3 NHT powered subs in one house may be enough.  :-)..

A smartphone to calibrate extra low frequency seems questionable but way better than no EQ and remote control. 

I've owned six Velodyne Acoustics subwoofer's beginning with the ULD and currently two DD Plus' for the past eleven years.
A failed remote receiver in my early DD was replaced for free well out of warranty but prior to the sale of the company.

I don't think there's anything out there that provides the convenience of the Velodyne Parametric Filter Frequency and Level drag and drop adjustment for eight individual frequency bands not to mention Velodyne's other features that I use often. 
By the way DD-10 Plus measures 13"W x 14.2"H x 16.5"D.

Good luck with your search. 
   

OP:
They are rather intimidating to look, but "brute force" isn't something I'm hearing (although they could be adjusted that way... like any other sub) while listening to them. The nice thing about having eight 10" woofers is they don't have to move much & as such, are very fast. I completely understand not wanting to wait however.  

That Martin Logan sub is also available at Crutchfield which has a generous return policy (check for specifics on subs) and a reputation for great customer service as does Music Direct. Martin Logan products go on sale about twice a year for a considerable discount, might be worth the wait. 

I'm seriously considering this sub for a small music only system so I'll be following this closely.

@m-db  Thanks for writing back.  It's not so much the smartphone to calibrate anything.  It is, and always will be my ears. OTOH, being able to adjust volume by +/- a db, slope, and eq it in three places within it's response band from my listening chair should be terrific.  I'm trying to dial in a pair of 10's in the living room system (5.2) now and to get to one it's move the chair and slide over the plant to get to it and the other has to be accessed from the rear which means open the sliding doors to get to the back from the balcony.  I'll probably never get them exactly where I want them due to the PIA factor.
@boxer12 Thanks for writing back.   Perhaps I could dress them up as a totem poles? ...  LOL, in reality there are already tower traps, bass traps and studio traps in place at the front of the room in addition to side and rear panels.  A couple of 45.5" high sub towers just won't fit, even if I wanted them too. I'll place my order tomorrow AM with MD if they don't collect Florida sales tax, if they have started it will be Bezosed and be here Friday.