6.5 vs 8 vs 10 woofer


IMHO I think the 8 is the ideal size cone for mid/small sized listening rooms. Even for large size listening rooms. 
The lower mid hz's seem cleaner/clearer. And  there is so little fq's in 905+ of the music we listen to, it seems to me the 8  driver is the most perfect size cone.
A 10 size cone  has the potential to become overwheling, aggressive, attacking when amp gain is pushed just a  tad too much, = Better  volume  control with a  8 vs a 10. 
The 6.5 misses some of that lower bass which a  8 can voice superior. 
After listening to several YT vids with a  10 FR, I had considered going 10, but i think  staying with a  8 avoids regrets. 
I listen at low/mid volume. 

mozartfan
Well, I combine those with a pair of SVS SB-13 Ultras to make sure there's just enough bass.

They all come with volume controls. They don't have to be turned up to 11.
Wow!  I'm Not Sure..  Crazy!  the time we all have that is Free Time, on this..  is All..
I remember way back when...before the popularity of (invention of home) subwoofers... 8" was considered the 'proper' woofer size in many a sealed box 2 way system. 
I also agree no one size fits all!
My more 'conventional' speakers are 6.5s' with a passive for speed, to keep pace with Heil amt's.  Below that, a pair of 10" backed by a small sub for impact on demand.

The Walsh only need the sub for 'bottom'. *s*  Same for the Maggies.

Between the 3, I can adjust for the media du jour. ;)

The only 'one size fits all'....is a hanky.
Mozartfan is a very suitable handle.
His dogmatic unevidenced statements seem to be formed from the scientific knowledge available in the eighteenth century.