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OB dual sub servo placement

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dvenardos

OB dual sub servo placement
« on: 28 Feb 2009, 12:14 am »
I can't find anything on the recommended placement of OB dual servo sub.
http://www.gr-research.com/pdf/obsub.pdf
How far from the wall or can you just put it sideways in between your mains?

Thanks,
Don
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emac

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Re: OB dual sub servo placement
« Reply #1 on: 28 Feb 2009, 12:58 am »
According to Danny, they need a couple of feet from the wall in order to sound their best.  Part of why I haven't gotten a pair.  No good place to put them.
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dvenardos

Re: OB dual sub servo placement
« Reply #2 on: 28 Feb 2009, 02:08 am »
Quote from: emac on 28 Feb 2009, 12:58 am
According to Danny, they need a couple of feet from the wall in order to sound their best.  Part of why I haven't gotten a pair.  No good place to put them.

Yeah, I am trying to find a way to get an OB/IB sub. It looks like the spot were I could do IB is not optimum and so I am racking my brain to try and find a workable solution.
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TRADERXFAN

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Re: OB dual sub servo placement
« Reply #3 on: 28 Feb 2009, 03:22 am »
Where did Danny say that? I must have missed it.

I had set mine up as Linkwitz recommended here...

"A woofer with two 12 inch drivers arranged for dipole radiation. The woofer should be positioned at the same distance from the listening place as is the panel, and preferably along the side wall, for optimal summation of sound outputs in the crossover frequency range, and minimal excitation of room modes." He also suggested somewhere to angle it toward the listening position. You might want to give this a try and see how it works in your room.  I need to try pulling mine out from the wall and see if I notice any improvement.

-Tony
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dvenardos

Re: OB dual sub servo placement
« Reply #4 on: 28 Feb 2009, 03:36 am »
Does that mean sidewall at equal distance of mains? :scratch:
I have never heard that recommendation.
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emac

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Re: OB dual sub servo placement
« Reply #5 on: 28 Feb 2009, 04:04 am »
Quote from: TRADERXFAN on 28 Feb 2009, 03:22 am
Where did Danny say that? I must have missed it.

I'm not sure that he wrote it anywhere online.  But that's basically what he said when I emailed him about it.
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dvenardos

Re: OB dual sub servo placement
« Reply #6 on: 28 Feb 2009, 10:55 am »
Okay, let's get creative, how about some kind of ceiling mount OB design?
I know you guys are up for the challenge.  aa
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TRADERXFAN

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Re: OB dual sub servo placement
« Reply #7 on: 28 Feb 2009, 05:50 pm »
Well you must have it some distance from the rear wall... maybe thats what he was saying in that email?

The Linkwitz suggestion was equidistant from the midrange. So in a theoretical example, if you sat in the middle of a room, and were 10 feet from the left and right speaker, you would want to be 10 feet from the sub, in the same arc. Hopefully with the sub along the side wall, angled towards the listening position.

Whereever you put it, keep in mind that the bass is more directional on this design so if its on the ceiling or something you should angle it.

-Tony
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emac

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Re: OB dual sub servo placement
« Reply #8 on: 28 Feb 2009, 07:59 pm »
Quote from: TRADERXFAN on 28 Feb 2009, 05:50 pm
Well you must have it some distance from the rear wall... maybe thats what he was saying in that email?

The Linkwitz suggestion was equidistant from the midrange. So in a theoretical example, if you sat in the middle of a room, and were 10 feet from the left and right speaker, you would want to be 10 feet from the sub, in the same arc. Hopefully with the sub along the side wall, angled towards the listening position.

Whereever you put it, keep in mind that the bass is more directional on this design so if its on the ceiling or something you should angle it.

-Tony

Yep, some distance from any walls or any other objects.  Just like other OB or omni-directional designs.  The equidistant idea also seems very reasonable as well. 
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dvenardos

Re: OB dual sub servo placement
« Reply #9 on: 28 Feb 2009, 08:00 pm »
Quote from: TRADERXFAN on 28 Feb 2009, 05:50 pm
The Linkwitz suggestion was equidistant from the midrange. So in a theoretical example, if you sat in the middle of a room, and were 10 feet from the left and right speaker, you would want to be 10 feet from the sub, in the same arc. Hopefully with the sub along the side wall, angled towards the listening position.

So, you are saying something like this is optimum?


Quote from: emac on 28 Feb 2009, 07:59 pm
Yep, some distance from any walls or any other objects.  Just like other OB or omni-directional designs.  The equidistant idea also seems very reasonable as well. 

I think that "some distance" is the problem that Ed and I have. I have 8' to the wall, so 3' from the wall would put it practically in my lap. The same reason I can't do OB speakers. I have 15" from the rear of my speakers to the wall.
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Danny Richie

Re: OB dual sub servo placement
« Reply #10 on: 28 Feb 2009, 09:14 pm »
Linkwitz recommends 3 feet out from the rear wall as a minimum for an open baffle design, and I would recommend the same.
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emac

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Re: OB dual sub servo placement
« Reply #11 on: 28 Feb 2009, 09:52 pm »
Yep, what I thought.  I can get the speakers 3' from the wall, but I have no room for the sub unless I put it in the center of the room.  And then my wife may have some issues. 
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Danny Richie

Re: OB dual sub servo placement
« Reply #12 on: 28 Feb 2009, 09:54 pm »
You know, a single sealed box servo sub can be quite good.
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Stereodude

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Re: OB dual sub servo placement
« Reply #13 on: 1 Mar 2009, 12:30 am »
Quote from: Danny on 28 Feb 2009, 09:54 pm
You know, a single sealed box servo sub can be quite good.

Why go with a single 12" driver when you can go dual?  :lol:
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Danny Richie

Re: OB dual sub servo placement
« Reply #14 on: 1 Mar 2009, 03:27 am »
You're right. A pair of them in a sealed box, even better.
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EARGASM

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Re: OB dual sub servo placement
« Reply #15 on: 1 Mar 2009, 07:23 pm »
Removed by member.
« Last Edit: 25 Sep 2009, 04:04 pm by EARGASM »
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dvenardos

Re: OB dual sub servo placement
« Reply #16 on: 2 Mar 2009, 02:57 am »
Quote from: EARGASM on  1 Mar 2009, 07:23 pm
Yes! Definately go for a pair in a sealed box!!!  :green: There is no way you will ever regret it!

Yes, but us idiots need a box plan to do that. :)
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Danny Richie

Re: OB dual sub servo placement
« Reply #17 on: 2 Mar 2009, 02:17 pm »
Quote
Yes, but us idiots need a box plan to do that.


See two different cabinet plans at the bottom of the page.

http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=139
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EARGASM

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Re: OB dual sub servo placement
« Reply #18 on: 2 Mar 2009, 03:33 pm »
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« Last Edit: 25 Sep 2009, 04:05 pm by EARGASM »
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Stereodude

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Re: OB dual sub servo placement
« Reply #19 on: 2 Mar 2009, 03:52 pm »
Quote from: Danny on  2 Mar 2009, 02:17 pm
Quote
Yes, but us idiots need a box plan to do that.


See two different cabinet plans at the bottom of the page.

http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=139

I think his point was that it's not for a dual driver one box sub.
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