speaker placement 7.1

G

golfman

Enthusiast
Hi new to the forum. I have read many articles here but never posted.
I have a 7.1 system in a dedicated theater room. the room is 35'x15' I have two rows of seats. 4 seats per row. I currently have the side surround speakers at about 90 degrees to the first row maybe 85 degrees slightly in front of the first row I guess. They are mounted in the wall about 6' feet up. The rear surrounds are also mounted in the side wall farther back. they are about 135 degrees from the center of the first row. The problem is the second row. First the side surrounds are 3 feet forward and the rears are at about a 110 degree angle from the center of the second row. the system sounds good but I am in belief that this probably isn't correct for all seats.

My questions is should I move the seats forward so the side surrounds are in the middle of the rows, which would also put the rear surrounds farther back from the second row. ( more of an angle behind me)

or should I just leave it the way it is, since it sounds good? I am not sure it would sound better. I really don't want to move all these theater seats since they are bolted to the ground if It wont sound any better. THX
 
Cpt.America

Cpt.America

Full Audioholic
I may be wrong, but if it were me, I would run bi-pole side surround speakers directly split between the two rows, then run the rear surrounds on the back wall where they are supposed to be.

Another option (i think this exists) would be to run a receiver that has multiple surround outs, designed to run the same signal to multiple rows.
 
J

jostenmeat

Audioholic Spartan
Hi new to the forum. I have read many articles here but never posted.
I have a 7.1 system in a dedicated theater room. the room is 35'x15' I have two rows of seats. 4 seats per row. I currently have the side surround speakers at about 90 degrees to the first row maybe 85 degrees slightly in front of the first row I guess. They are mounted in the wall about 6' feet up. The rear surrounds are also mounted in the side wall farther back. they are about 135 degrees from the center of the first row. The problem is the second row. First the side surrounds are 3 feet forward and the rears are at about a 110 degree angle from the center of the second row. the system sounds good but I am in belief that this probably isn't correct for all seats.
I also suffer similarly.

There are two ways to think about this:

1. Compromise for all positions.

2. Create the ideal spot, and all other positions as compromised.

They both have their pros and cons.

I chose #2. I think gene chose #1. The way I see it is that there are many times I have only 2-3 viewers. Filling all seats is rare, though I've done that twice already with the dark knight.

If you compromise all seating, then NO ONE gets a perfect seat.

My questions is should I move the seats forward so the side surrounds are in the middle of the rows, which would also put the rear surrounds farther back from the second row. ( more of an angle behind me)
I'd personally decide on video immersion as #1 priority, and think of compromising from that point of view.

or should I just leave it the way it is, since it sounds good? I am not sure it would sound better. I really don't want to move all these theater seats since they are bolted to the ground if It wont sound any better. THX
Then there's that whole thing about enjoying what you have. I have my surrounds pointed so that its ideal in the front/center. By angling away from the rear row, the undesired localization of the surround being in front of viewer is reduced. Not as much as I might hope, but still helpful. And again, the front seats have more ideal surround. I almost always sit in front/center. ;)

You can use the surround amp channels to power one row, and then use the preouts to power a separate amp for another set of side surrounds.

When you do so, not only do you want to level match, but you also would generally like to choose the exact same speaker, same angles, and same distances.

As for employing room correction with two sets of side surrounds, its been asked, and I cannot possibly recall what was recommended.

Hope this helps.
 
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Jack Hammer

Jack Hammer

Audioholic Field Marshall
You might be able to add a "B" set of side surround speakers for the second row. So you would have your 3 fronts then a set of side surrounds "A" at 90* to the first row on the same channel as side surrounds "B" at 90* to the second row and finally your surround backs at ~135*. Hope that made sense.

Some AVR's are setup for this already. Here's a really poorly put together visual to give you an idea (the dashes are the seating rows):

FR Ctr FL

SSa - - - - SSa
SSb - - - - SSb

SBR SBL

Jack
 
G

golfman

Enthusiast
Thank you for some of the ideas and suggestions. I did test the system from the back and front row seating. All seats are right around 75db give or take. I guess the audessy multi EQ is doing a pretty good job based off the six points I used to set it up. Someone suggested moving the back surrounds to the back wall. This can't be done in my room since the staircase is behind the seating and the back wall is only a partial wall. The system is set correctly based off the first row middle seat even with the back surrounds on the side wall. (room is long so I still get a 135 degree angle for the back surrounds from that seat.)

I guess if it sounds good from all seats, and I have one seat that is the sweet spot, I shouldn't worry about the back row so much?

Having the side surrounds in front of the back row and only about a 110 degree angle for the back surrounds worries me, but the spl meter is around 75db from that row and it sounds good. Side surrounds dont appear to be to hot.
 
G

golfman

Enthusiast
Can you run the side surround pre outs on a onkyo 706 to an extra amp and still have a pair of speakers hooked to the receiver for the other set of side surrounds, assuming you where to do a 9.1 type system. I say type system since it would be a 7.1 but with an extra pair of side surrounds for the back row seating? If so I could use my current back surround speakers as side surrounds for the back row seating, then install a pair of new back surround speakers behind them. They would have to be in ceiling speakers since I have no rear wall to mount them to.

Are in ceiling speakers Ok for back surrounds?
 
J

jostenmeat

Audioholic Spartan
Can you run the side surround pre outs on a onkyo 706 to an extra amp and still have a pair of speakers hooked to the receiver for the other set of side surrounds, assuming you where to do a 9.1 type system. I say type system since it would be a 7.1 but with an extra pair of side surrounds for the back row seating? If so I could use my current back surround speakers as side surrounds for the back row seating, then install a pair of new back surround speakers behind them. They would have to be in ceiling speakers since I have no rear wall to mount them to.
Your question was already answered in this thread before you asked it. It was already offered as one my suggestions above:

You can use the surround amp channels to power one row, and then use the preouts to power a separate amp for another set of side surrounds.

When you do so, not only do you want to level match, but you also would generally like to choose the exact same speaker, same angles, and same distances.

As for employing room correction with two sets of side surrounds, its been asked, and I cannot possibly recall what was recommended.

Hope this helps.
Are in ceiling speakers Ok for back surrounds?
Sure, why not? In ceilings are perhaps not the ideal arrangement desired for any particular channel, but if I can think of one way they can be a convenient solution is exactly for a case like this: to fire over two rows . . .
 
G

golfman

Enthusiast
Thank you for the answers, I really was asking more about the pre out on the receiver. I wasn't sure if my current side surround speakers will have power from the receiver if I also use the side surround pre out on the receiver to an external amp?
 
J

jostenmeat

Audioholic Spartan
If it didn't work I would never have recommended it to you. Twice.
 
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