Room set up

It is called Audyssey. The difficult part of Audyssey is that there is no room for error and to make any mistakes. You need to work at mm precision.

Systems like Dirac are more easy to use, but they have a big limitation compared to Audyssey. When you use Audyssey the right way you will not loose low, mid and high frequency details compared to most other room correction systems.

Room EQ Wizard, if you have a way to input the its test signals into your system.  It’s open sourced/free, just have to buy the mic and will help you get your speakers into position.

REW is great for room measurements, but won't tell you how to move your speakers. It'll just give you data to work with, but you'll still have to use your ears and mind.

I find REW very helpful, but it's good to be realistic about its capabilities.

mancub1,

Since you have 4 subs, and if those subs are positioned properly in your room, there’s absolutely no need for any microphones, room analysis/correction software, room treatments, prayer, chants, higher power involvement, snake oil or voodoo whatsoever to achieve exceptional bass response throughout your room without any perceived boominess. IMO, your issue with boomy bass is a direct result of randomly placing your subs one in each corner.
No worries, there’s a guaranteed setup procedure that will result in exceptionally good bass response throughout your entire room. Only downsides are it’ll require a few hours and it’s best done with a helper to share lifting duties and help decide on optimum positioning of each sub. Here’s the procedure:

1. Place sub#1 (the one currently in your front right corner) at your normal listening position and play music with solid and consistent bass.
2. Starting at the front right corner of your room, walk slowly right-to-left along the front wall until the bass sounds the best to you. Once this optimum spot is determined, position sub#1 at that exact location.
3. Place sub#2 (the one currently in your front left corner) at your normal listening position and play the bass-heavy music again.
4. Starting at the newly positioned sub#1, walk leftward along your front wall until the bass sounds best to you. Once the optimum spot is determined, position sub#2 at that exact location.
5. Repeat this process for subs #3 and #4 and then sit at your normal listening position and evaluate bass response listening to the same music. If you do not perceive the bass response as exceptional once this setup procedure has been completed, you’ll unfortunately need to repeat the entire setup since 1 or more subs were incorrectly positioned. Be aware that exact positioning is critical and even small errors affect results.

This is admittedly a tedious process but results are well worth the effort. I’ll spare you all the scientific basis for this procedure but you can google Dr. Earl Geddes and Dr. O’Toole on in-room bass response research. if you’re interested.
The main requirements for great bass response in any room is at least 3 subs and careful sub deployment.

Tim

mancub1,

     I  just wanted to add that your system is similar to mine; I also utilize 4 subs in my system and go directly from the 5.1 outputs of an Oppo Bluray player to multiple amps.  My setup works equally well for both ht and 2-ch music.  I don't think you stated if your system is used for both or not.
     Regardless, I think you'll be impressed with the bass results in your 18' x 22' room (mine is 14' x 23').  I'm fairly well versed and experienced in these types of setups and willing to assist you on this thread if you decide to try the setup procedure.  
    About a year ago, I started a thread here on Audiogon concerning this 4 sub setup- called a Distributed Bass Array System- and whether anyone else was employing it. 
 my  Here is the link to that thread just in case you'd like to know a bit more about it:

 Anybody else using a distributed array sub system?

      I bought the Audio Kinesis DEBRA complete system which is virtually identical to the Audio Kinesis SWARM system reviewed by The Absolute Sound in this review:
http://www.theabsolutesound.com/articles/audiokinesis-swarm-subwoofer-system/
    
      I'm not sure which 4 subs you own but I know the setup procedure I described earlier will work with any 4 subs.

Tim