Now that I'm back home, wanted to add one more thought:
Warrior is correct in what he says. Most of the time, we are playing a balancing act, though. I don't have a mic or REW yet either. I have to rely on my ears to help me make my room sound better.
One side of my room, when I look at my Audyssey measurements is a bit of a mess with diffraction: I have a window and a standing drafting table on that side! Regardless, these are my takeaways from my reading and experiencing sub-woofer placement without measurement tools:
First: turn Audyssey OFF!
Disconnect/turn off everything else but the Sub you are putting in your LP.
- You don't have to put the sub in your seat, but you need to put it as close as possible... so move some furniture if you need too. Or put it in your seat... (mine is a 100#+ down-firing beast. I just moved my chair away).
- I already told you to be patient. Keep your Mind and Ears open! Listen along a wall first, and move into a corner. This helped me out when listening. Corners will amplify bass (the premise behind corner loading). The most important thing is that you learn to hear the subtle differences! And they can be subtle. (Except for when they aren't, but those tend to be extremes.)
- If your goal is good bass and you can rearrange furniture: Do it! Your chest or table or lamp can move a few feet if its worth it to you. (Keep your mind open)
- The best place for subs also is not necessarily the front wall or corners. (Keep your mind open.)
- Depending on the size of your room, volumetrically, you may need to consider a near-field placement (behind the couch, as an end table, etc. (Keep your mind open.)
Remember, you are listening to find a spot where the bass sounds Good! When you find it, mark it, and look for the next, and maybe even a third just to have the option. When you get everything set back up, you will need to re-run Audyssey. Keep you new Distance and level measurement, but experiment with turning Aud. on and off like I suggested before. Also with the App, you can move the range that Audyssey adjusts for below the Schroeder Frequency (usually between 100-200Hz) of your room and have it just manage your LFs, leaving your higher frequencies untouched.
Also experiment with Turning your Dynamic EQ off, as well as that mid-range adjustment, or whatever they call it (responsible for the 2KHz dip in your curves).
Regarding that last thing: my room is kind of lively, so I turned Aud. OFF, but went into my Graphic-EQ in the AVR, and built a slightly less impactful version of that 2K dip which really helped keep my audio clean, but not dull.
Hope some of this is useful to you!!!