A full range speaker?

You can spend more and get less.
IMHO anyone chasing after deep powerful bass, super sparkle highs,,  might end up witha  midrange 800hz-2k hz which may have coloration/distortion issues.
I don't know, Seas seems to understand these issues and attempts to achieve a  balance of the 3 fq ranges.

https://www.madisoundspeakerstore.com/approx-5-woofers/seas-excel-w15ch001-e0037-5.5-magnesium-cone-...

As per Millercarbon's comments on bass and harmonics I recall my late friend George Bischoff's comments. George was heavily involved in Pipedreams and Scaena speakers, both of which were definitely full range. He alsways said that to build a better woofer build a better tweeter meaning, of course, that bass quality depended as much on the bass notes harmonics as on it's fundamentals.

daledeee1, absolutely incorrect. Specs as published mean very little. They are taken at one meter in an anechoic chamber. At 3 meters in a real room the story is entirely different. Most speakers start dying at 80-100 Hz with a peak or two below depending on room nodes which results in one note bass.

both of which were definitely full range. He alsways said that to build a better woofer build a better tweeter meaning, of course, that bass quality depended as much on the bass notes harmonics as on it's fundamentals.


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Your friend was on to something,, ~~Fundamentals~~
YOu see Scanspeak's beat Seas Magnesium in the deepest bass fq.s
More  punch, kick,
But what Seas gave up in the deep bass of the drum percussion, they gain in the upper bass/low midarnge.
Paper composite has its own characteristic, and Magnesium has its own particular voicing.
__bass notes harmonics**. The bass guitar on the magnesium is unreal, super sweet. 
THe Scan paper composite just won't work for  my  peculiar taste.

You see Wislon sticks a  bunch of drivers in a  cabinet offering you  true /complete full range, deep powerful bass, sweet glorious highs,,
But at the sacrifice of upper bass.low mids, quality control....
Vandersteen is guilty of this mid issues as well, but certainly  at a  lower price  tag. 
Wilson has a  speaker now, approaching close to the $1M tag, (M as in Million!!)

mijostyn4,713 posts07-21-2021 7:22amdaledeee1, absolutely incorrect. Specs as published mean very little. They are taken at one meter in an anechoic chamber. At 3 meters in a real room the story is entirely different. Most speakers start dying at 80-100 Hz with a peak or two below depending on room nodes which results in one note bass.


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WOW
Very nice info here. 
You justn saved me from consideringa  Seas 2 way with a  dedicated midrange and adding a  W26 or W22,.

based on your info, 
makes no sense for me to attempt to gain a  deep bass than what i already have.
Dual 6.5's might in the end beat out a  single W22 or even a  single W26

Both the W22/W26 on paper go lower, but as you say ina  test room, 1 meter.
In real time, its a game changer.
No, I'm thinking now dual W18's = best bang for the bass buck. 
Troels pretty much confirms this on his notes about Dual W18's bass punch.