Originally Posted by 65 Electra Glide
The other two things in your post which I have quoted in bold demonstrate as much with their clear cut contradiction to each other.
I assume you mean:
"That's a non-full range speaker sitting on top of a subwoofer."
"It's an on-wall system; so not mounting it on the wall will result in baffle-diffraction problems"
The first quote discusses the picture he provided. It shows one of the JBL PT800's sitting on top of a JBL PT1200 subwoofer.
The second discussed the intended (by the manufacturer) mounting of these speakers. (yes, I can see that the ability to mount one on the other is explicit in the design as well: see below)
Here is the description from the link provided by 4DHD
"Factory Reconditioned" 3-Way 8-inch wall, corner-mount or bookshelf satellite speakers
Note: 3-way (that's no subwoofer), "corner mount or bookshelf"; and that does mean that there's a baffle problem with at least one of those scenarios unless there's an adjustment for the crossover (I've listened to these JBLs, but I've never played with them)
I did not get the impression that he was recommending dual subs; but perhaps that's because no subs were in the provided link.
It's an either or scenario, not one or the other, and when used as a tower, they are indeed pretty much full range, certainly significantly more so than Salk STs.
You mean if you buy a pair of the subwoofers?
Those aren't actually on the page he listed; so I have no idea if he intended for $1200 to cover one sub or two. They look like they are $750 used, so I must assume 1 sub.
So you are back to bookshelves and a sub (which is not what the OP asked for) at $3300 (which is 162% of the OP's budget).
You could go dual sub (I assume that puts us at $4500) and get your full range (and it would certainly go lower than a pair of Song Towers (which isn't surprising since you are at more than double the price)); but even then you only get to 30Hz @-3db (http://www.jbl.com/resources/Brands/jbl/Products/ProductRelatedDocuments/en-US/ServiceManual/Ps1400%20Sub%20SM.pdf
Of course: you could get a lot more SPL and much lower (16Hz) for less money by tacking http://www.svsound.com/subwoofers/cylinder/legato#.ULf1tofO0-s
on to the SongTower purchase.
And you wouldn't have to worry about that messy high-frequency sub crossover like you do on the JBL, so you could place your subs for better LF sound rather than being nigh-forced to pair them with the speakers out of fear of localization.
Oh, and you saved $300.
The lengths people will go to defend stepping in and bashing someone's suggestion with one that didn't even meet the OP's guidelines is impressive.