Here's a source for building inexpensive and effective bass traps:
For some reason, Agon vears away from room treatment discussions. Maybe because it can get complex.
There are different schools of thought, but I like to deaden the wall (not completely) behind the speakers and difuse the side walls at first and second reflection points. And difuse behind the listening position.
Base traps would go in the corners behind the speakers.
Since you mention your VR4jrs. Make absolutely sure you position them the way that is mentioned in the owners manual. I had to re-read mine several times and I somehow missed that there is an optimal placement for them which is 8' apart sitting 8' from each speaker.
Hope this helps a little.
Also, absorbtion panels are easy to make and bass traps are tought to make DIY, be warned.
Here's another wealth of information:
This is Ethan Winer's monitored forum for room acoustics. It's terrific. I've built a bunch of inexpensive broadband absorbers and bass traps, and it has utterly transformed my listening room. It's so obviously the best investment any audio fool can make!
Yes sir, room acoustics dollar for dollar is the best improvement you can ever make. A lot of people think that having a great system is all you need. Hey it does sound better then the $200.00 system, but with the right room you can have the ultimaty sound.
Build them or buy them, your ears will love you for it. :)