How to do room acoustics correction the easy way.

Update....I purchased 6 Corning 703 panels, 4’ X 2’ X 2”.   I placed one behind each speaker and 2 in each front corner placed on top of each other for an 8”height.   I was shocked at the difference in bass resolution.  The sound stage opened up voices became more precise.  I just was not prepared for how much improvement there was.  Thanks all for the guidance and advice.  What an amazing bang for the buck.  I’ve been in front of the hifi for over an hour listening to music I’ve heard 100’s of times and it does sound better!.. Grateful this is a room my wife doesn’t have decor authority over!

Thanks to all...bought the Harley book and ordered the acoustic panels.

To continue, will my plan work or should I do more room treatment.  I have so many reflection points before  the wall opposite the speakers...

Thanks mc.....

So more info.  Room is a converted garage 24x22x10.  No longer looks like a garage.  Sheet rock walls. Lots of wall treatments.  GE Refs sit 4’ out from the wall with 9’ between and 9’ to listening positions.  Directly behind the sofa I use, there is a large weight machine and treadmill.  I know I am having reflection problems, I hear it as smeared midrange...guitar and vocals.  I hung 4 heavy shipping blankets immediately behind sofa about 6’ high that extended about 8’  across. Smear and edgyness went away..  That’s what I hope to mitigate with room correction software.  I don’t want the blankets as a trap...

Thanks for the help folks...should have posted a year ago!