Different subwoofer settings for different albums?

You don’t want to divulge the name of the dealer? He didn’t do anything wrong -- he has a view about audio and he’s willing to state it. You’re protecting someone who has a greater ability than the average person to defend a view about audio. Why do that? If it's because you suspect they actually can’t defend themself, then you should consider whether they deserve to be a dealer in the first place.

It's called 'Level Matching' (subs to mains).
All you need is a SPL Meter and external 'Test Tones'.
From what I've gathered based on the various subwoofer threads here at a'gon, seems it would be too complicated for the majority of members to invest the time to do it right - oh well...

@hilde45 -- look this was a private conversation with this dealer and I didn't provide him any indication I would be broadcasting any of his personal opinions by name on a public forum so I just feel weird about doing so.  PM me if you want more info privately.

I guess your dealer thinks that you like to play Record Producer instead of listening to an album as intended. 

It can be a problem in some situations and recordings but usually you can find a setting for your subwoofer that works for almost all of your music.