7.1 rear speaker wider than side?

B

beavercreekfs

Audiophyte
I am finishing my basement and have a large room in which I want to prewire for sound. I have a box Onkyo 7.1 system I plan to move to the basement.

The seating area will be 12' fromt the TV and the back wall is 10' behind the seating area. I plan to place the front speaker as wide as 58" from the center and back 83" from center. The problem I have is the side channel speakers. There is a collumn on each side of the seating area and there would be an ideal place to mount the speakers. These are only 67" each from the center position. If I do not use the collumns, I will need to go much wider. One side wall is 131" away and the other is 193" away. The only other option is to place the speakers near the ceiling and the beam which the collums support.

Any recommendations would be greatly appreciated. Thanks
 
J

jostenmeat

Audioholic Spartan
38% of room length is the best position in a closed rectangular room for best avoidance of axial modes. That number may drop as low as 33% when including non-axial modes. That means for you this represents 7.26'-8.36' from back wall (or front wall), assuming 22' is accurate.

If say you scooted forward to be 8' from TV/speakers, I would try 48" distance of each main respectively to center speaker to form an equliateral triangle, and then to tweak from there with experimentation. This of course assumes the three front speakers are on the same parallel plane respective to front wall. Actually, it would be ideal to bring them in a bit to have equidistant measurements from all three fronts, however it's not that big of a deal. If you did so, of course the numbers start changing a bit.

Regarding side surrounds, 67" is a perfectly fine distance. It's the angle that is more important, IMO, as long as a minimum distance is achieved. Directly at side, 90 deg, for greatest side envelopment, or up to 135 for better rear phantom imaging, or perhaps roughly at 110 for a compromise between the two.
 
B

beavercreekfs

Audiophyte
Further question.

Thanks. I will post a diagram soon to ensure my understanding is correct. My concern with the side speakers at 67" from centerline is that they will be too close to the edges of the listening area (those not on the center). How far should these speakers be from the edge listenters?
 
lsiberian

lsiberian

Audioholic Overlord
Thanks. I will post a diagram soon to ensure my understanding is correct. My concern with the side speakers at 67" from centerline is that they will be too close to the edges of the listening area (those not on the center). How far should these speakers be from the edge listenters?
Make sure you mount them up a couple feet and then aim them down at the listeners.
 
J

jostenmeat

Audioholic Spartan
Thanks. I will post a diagram soon to ensure my understanding is correct. My concern with the side speakers at 67" from centerline is that they will be too close to the edges of the listening area (those not on the center). How far should these speakers be from the edge listenters?
Ah yes, well first of all, there are ALWAYS compromises. No matter how you slice it, people on the edges do not have the best seat in the house. Ok, ideally, you would like at least several feet from the speakers to the ears.

So, just exactly how close are the edge listeners to the speaker position in question? Even if as close as a few feet, I might still lean that way. Not only is 193" pretty far away, it's not symmetrical either with 131".

If it makes you feel better, surround effects are truly few and far between. Many movies have nary a surround effect at all.

Just level match them, which means they will be set to a lower level. Surrounds shouldn't distract you, but subtly add to the movie experience. Then again, some people run 'em hot.

IMO, the biggest place to concentrate is the front stage. Particularly the choice and placement of center speaker. Ideal of course is to use three identical, vertically arrayed speakers on the same plane. Everything else is a compromise in some way or another, in terms of audio. Of course, that's often not possible, such as in my case with a large PJ screen that's not AT. But many could do it with a wall mounted flat panel, but IMO they often are brainwashed by furniture magazine pictures.

edit: and these large credenzas are usually very expensive, besides the compromises to both audio, and often video (distracting lights). 35ft Mono cable is $50, a URC RF system is $85, and for just $135, you can hide the electronics. Or at the very least, just have a very inexpensive vertical rack in the back corner or something . . . I mean, that's all that's needed to setup the ideal front stage.
 
B

beavercreekfs

Audiophyte
Is there any way to attach a picture

I have a layout drawing but do not see how to attach a picture.
 
B

bpape

Audioholic Chief
I think you have to have 5 posts before you can attach or link.

Bryan
 
B

beavercreekfs

Audiophyte
Diagram of room

Ok, I have not done any of the entertainment wiring yet. I need to get moving so I can get the drywall going.

I want to put the tv on the wall by the stairs. I want to place a V of seating directly in front of the TV close to the center beam and between the post. The other option will be to turn the whole setup 180 degrees. I actually plan to wire both ways, so I need help with both.

One dim that is not shown is the distance from from the centerline to the stair door. This dim is 48".
The easiest place to put the side speaker would be the post. If I do not use the post, I will have to go out 10' to the wall and then put the other side speaker high over the bar by the beam?

Please help me get the best layouts.

I cant post with with the link yet. Here is broken. I will repost a couple of times and include

h
ttp://img9.imageshack.us/img9/3663/roomlayout.tif
 
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