I also find the bass of my VR4jrs to be probably the least strong area of its sound. Its not that its bad; just not as good as the jr's other considerable strengths. It could be that I get to compare with a friend's PMC IB2s and the bass from those speakers is in a different class to the jrs.
Do remember that apart from positioning, make sure you load the VR4jr with ballast as this does tighten up and improve the bass significantly.
Do remember that apart from positioning, make sure you load the VR4jr with ballast as this does tighten up and improve the bass significantly.