low bass response

You need to quantify your expectations for low bass response. One would think the Salons would be quite capable in reproducing satisfying bass, but that is subjective.

Try reversing the polarity on both speakers and see if that improves the bass!

If it's the room or listening spot, walking around should answer your question.  There will be nodes.  

That room is far too reflective and those speakers have wide horizontal dispersion. A bad combo. The entertainment rack is enclosed in another very reflective piece of furniture. If you must put the speakers in this room:

• Get rid of the armoire
• Point the speakers at 45 degrees to the wall
• Treat the room with absorbers, including the ceiling, especially the ceiling with mid-high frequency (i.e. thin) panels
• Put diffusors where the armoire is and to the sides and behind the listener. Absorb otherwise.

Honestly not a fan of Pass here either.  I mean, I don't like the sound but exactly because I find them too lean sounding.  Other alternatives are just to use tone controls.  Get a Schiit Loki and see if it does what you want to do.

Remember that your listening levels matter.  If you like to go in and listen at quiet volumes like I do a loudness control is essential.