Different subwoofer settings for different albums?

Depending how audiophile one want's to be, my ears hear bass levels that need the gain bumped up/down. Not a big deal to me.

Otherwise, the gain is somewhere in the middle like the compromise of your phono cartridge.

There are those classic LP with just too much low end-Chicago debut?
Humble Pie-Smokin? Chambers Brothers-TIme has come today?

REL G1 or No.25 with remote is perfect for a sesssion. I wonder if you had a swarm or 6 pack, does 1 remote control all of them?

Nonsense….

this only comes up if you want to hear the sub all the time. As in trying to add bass amplitude rather then extend the frequency. 
Once a sub is set flat with test tones it simply plays what is there and every album does tend to have different bass levels. Some songs my subs do almost nothing and other songs they rattle the doors. 
I have found with one sub you can get some pretty big nulls at certain frequencies and can tend to very from song to song more than two or more subs depending on if the songs prominent bass note hits the null or not.  But we’ll setup subs just play what is on the source. 
I am of the opinion subs are one of the best upgrades you can make when done right. When done wrong they can really mess things up. 

He probably never tried a REL subwoofer. This is the best your going to get as far as subs that blend with main speakers. Its not perfect but its very close. I hated subs for this reason for a long time, until I bought a REL B2 Britainia ...now I love my sub.

So a dealer I know told me that he doesn’t use subwoofers and doesn’t know anyone who does (!) because he finds that every record has different levels of bass and would require a new subwoofer crossover point to properly blend with the main speakers. 

The least insulting thing we can think to say is you might want to consider looking for another dealer.