A full range speaker?

That range is from 26hz to around 12khz including harmonics, but the speakers that can go that low are few and far between

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I've looked over every option from Seas and Scanspeak

Every woofer that goes below 30hz, has a  paper composite cone.
My hifi journey all began with paper woofers. I am trying to avoid this paper woofer resonances.
In my experience the magnesium material cones offer best dampening and cleanest upper bass fq's. 
The Scanspeaks offer a  deep bass kick, Seas Mag's superior upper bass/low mid fq's. 

Note carefully what Troels say here

**The edge coated driver....but it does make things sound **better** than it ACTUALLY SHOULD,,,as is sometimes the case with drivers displaying significant linear distortion ,,,which can sometimes be SEDUCTIVE,,but none the less ,,,DISTORTED...
Vandersteens and countless others,, B&W.s , come to mind here.
**Yeah I’ll take em...** Get home,,WOW , love em,,,6 months later,,,haha,,1 years later,,,**maybe I should upgrade or change labs..** haha.
Eventually our old friend,,or should i say ,,fiend,,,, the Fatigue factor will come around.
happens all the time.
Why?
The Seduction factor got the best of ya.
Not once have I ever felt even the slightest faigue with the magnesium cone mids.
Purchased 2004, and believe it or not, had the Thors up for sale at $900, with new Millennium tweets.
man would that have been a major mistake...
More than likely when I recover from the **Vox Project** I will swap out a W18 for a W22.
Not sure if I;’ll go W22E001 or the new W22 Graphene.
have to look over magnet weight, lowest hz spec.

http://www.troelsgravesen.dk/SEAS-W12CY006.htm

There 
the 20hz-40hz, 
Ain't worth the trouble\
15khz,,, yeah like we can all identify these 15k-25k hz's when  struck by a  instrument,. 
I'm telling  ya, thats all bogus snakeoil
40hz is rock bottom, 
12khz is top of Mt Everst. 
above 12k is  for outer space astro-nuts.
Below 40hz is for cave dwellers.

Thankfully, you are not in charge of anything. Go on, keep throwing money at this trying to cobble together something without ANY clue as to what you are actually doing. It is great entertainment watching you fumble around cluelessly. If you had saved all of the money you have blown in the last couple of months flailing about, you could have actually bought something that sounds good, designed by someone that actually knows what they are doing. By all means though, carry on. 

I guess this is is just a hypothetical question since most rooms in your typical home could not handle "full range" orchestral reproduction. Bass waves are really big and even placing four bass traps in the corners of a typical room that would be given over to the audiophile in the house is not going to be adequate. It might be interesting to figure out what speaker frequency range works best in a typical home to reproduce as close as possible a full orchestra and what minimum size room would you need. Assume that the room can be treated for sound, but realistically that probably won't be the largest rooms in most homes, such as the living or family room, so four subwoofers would be out, maybe two at the most. How far down does one really need to go or for that matter, does one really need a pair of super tweeters to get satisfactory results?