If i was you i would place your speakers as far apart wide as you can, and then you will need to the same distance they are apart from them... Like a triangle..The the first rule i guess.
Do you know anything about measuring frequencies?... Or do you prefer to go by if you like it or not..?
While buying the stands , go out and get some Rockwool or Fiberglass, something like that to make some bass traps, Believe me those speakers can be little monsters if you let them run wild..
I don't know if you familiar and use the settings on the back much.. Well they have EXAMPLES to set it up, but actually i use them differently...Its hard to advise without being in your room to listen, The SPEAKER POSITION SETTINGS just toy with the "boomyness" of the low end.., not the sub bass.
Try a few positions of the insulation... but definitely try this: http://www.gearslutz.com/board/attac...mput-photo.jpg
This is from a post about me tweeking my room as we speak..
If you get tome, go read the post, as you will see the difference i was able to make with moving the speakers around inch by inch until i got a nicer, flatter response in the bass area. REW does not red imput ???
As ou will probably find soon on this forum, try to trap all corners Floor to ceiling. You need to try it.. It can save your life, In my case it did not work, as i am in an attic with bizarre shapes, but for standard rooms like yours, you should do it..But the floor corner traps like i showed you are really important.
make sure your low cut is set to 36 on both speakers, now stand next to the speaker and play with the positioning...buttons while music is playing..You will hear immediatly which is better for your room..Its better you stand next to it and toggle though them as if you just switch it, and then walk all the way back to your chair and turn music on, you wont really remember if it better than before or not....It basically changes how much low end it throws out, so depending on your room, you will hear instantly which is the best of A B or C...
The reason i think they need to be far apart is because they are big speakers, not huge, but the low end is and i got huge dips and nulls in my 70 - 120 area when they were close together...And that is the belly of all low end frequencies. .. After moving they to the sides, then switching the A B and C to find the best one 70 - 120 really evened out and now it punches great...
I hav heard these speakers in other studios where they are in the middle of the room, Not the greatest over all low end response, very hard to feel the meat in those positions..
OH OF COURSE..
I build my stands, it was well easy..I would think its better to have the little area Between the Cone and the tweeter at ear level.. I build a pair of stand a few cm too high... Now the top of the stand is 94CM and before was 100.
I had to change it because i could not put my feet on the floor as i had to rise the chair as high as it would go...
This was impossible for me, and the sub on the mackie is so strong, I use the floor to feel the 100 hrz punch in the kick drums... Without that, i was not comfortable...
Just another little thing i found...
if i remember more i will most it here