Originally Posted by drriddhish
I have only one row about 12 feet away from screen, leaving total of 7 feet on behind. For towers I was going to place them side surround ...
Distance to MLP would be bout 9 feet on each side and the closest seat would be about 3.5 feet from towers...
The problem with low ear-level speakers at the sides is that the person sitting next to that speaker has their experience dominated by that one speaker.
If the Towers are in the rear at a distance, or if bookshelf are at the side and higher, then the sound has room to spread out and cover the entire listening area.
Yes, I have see tower speakers in close proximity in very good system, but it is a compromise. The question isn't will it work, but rather will it work best.
If you have space behind, and you have bookshelf and floorstanding, then place the Towers far back at the rear, and the bookshelf up a bit higher on the sides.
Now, you can do anything, and yes, not matter what, it will work. But what is the combination that will work best.
Every system is a compromise ...unless by chance you have a larger dedicated room and a very large pile of money ... but you try to make compromises that lean toward what you need and away for aspects you care less about. You, in a sense, have to maximize and optimize with in the equipment and circumstances you have.
In my case ...simply as an illustration... I have 4 front speakers, and that causes some problems, but what I gain more than offsets what I lose, so I've made the compromises that suit me.
As to speaker placement as a general principle, you have to maximize the listening area. The sound needs to reach the entire listening area not just the single prime seat. I don't see that as possible with a Tower speaker at the side at ear level. That's just me, others may disagree. But that doesn't seem ideal.
Just as a general bit of information, a tweeter will generally spread out in a prime arc of 15°. The Tangent of 15° is 0.268. So at 10 feet, the sound has spread about 2.68 feet. The scale is linear, so you can scale it up or down easily. If 10ft is 2.68ft, then 5ft is half that at 1.34 ft.
The Arc is the Tangent of the Angle times the Distance.
Using this, you can get an idea of whether the speaker is covering the entire Prime Seating Area. Since the output is generally in a cone of sound, this can apply both vertically and horizontally.
The prime arc for tweeters is typically 15° (±7.5°) within which the sound is uncompromised (more or less).
The secondary arc is 30° (±15°) within which there is some compromise.
Hope that helps.