Can anyone hear the difference when you add REL subwoofers when playing two channel


I wonder if anyone else has had problems hearing a difference when adding REL subwoofers to their two channel systems?  I have gone back to a reputable dealer in town to listen to a pair of Vienna Acoustic Mozart's paired with a REL S3 and I couldn't detect a difference when they added and subtracted the REL.  I wonder if this was because the Vienna Acoustic Mozart's are already can extend down to 30 Hz.  I have also read reviews on the Mozart's and they said one of their criticisms was they felt the Mozart's to be too boomy in the bass.  

The dealer keeps telling me I am expecting to hear a more punchy pounding bass sound and that is not what I should be listening to.  He keeps saying I should be listening for greater depth and space to create a larger sound stage.  He went on to say if I had a subwoofer that delivered too much bass, they would eventually drive me out of the room and spoil my enjoyment of listening to music.  I thought I had sensitive ears to sound, but in this case I wonder if I am tone deaf.  My fear is getting a pair of T/9i's in my home and my wife telling me I wasted our money because she could not hear a difference. 

There must be a reason why so many dealers have told me their first pick would be a REL because they are so musical.

I also question why REL manufactures their subs with such low wattage?  For example, their S3 delivers only 400 watts and their T/9i's deliver just 300 watts.  When comparing them to  subwoofers like JL, which deliver 750 watts to $1500 watts, maybe REL subwoofers are just too wimpy.
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significant difference for me with a single REL S/5 SHO...and my speakers go significantly deeper than the Mozarts
I added a pair of REL S/5s to my system, which has Focal Kanta No 2s driven by a Levinson 585.  Surprisingly big difference.  Not just the bass (although it was markedly deeper and more impactful), but also in the sense of air and space around the performers.  Worth every penny.
I am using a pair of REL Carbon Serie S (same Power as S/5) and they added another dimension to overall musicality. I picked out REL for bass quality and their seamless integration with the main speakers.  

To my ears, what makes REL performance extraordinaire is its clarity and focus in addition to its obvious bass extension and dynamic headroom. 

I would like to point out, subwoofer takes bit of patience and tweaking with placement. Once you get them dialed in properly, you wouldn’t imagine listening to your system without the subs ever again. 
What concerns me is how little watts the REL subs put out.  The T/9i with only 300 class A watts, the S3 with only 400 watts class D and the S5 with just 550 watts class D.  Other sealed subs in the same or lower price range put out 800 watts to 1500 watts.