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Re: Multiple Subwoofer Set-Up & Calibration Guide
#305525 05/08/10 06:29 PM
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So... if someone wants to utilize the four corner placement of the subs but also wants to employ bass traps in the four corners, what effect does that have on the efficiency gains? Any penalties?

Re: Multiple Subwoofer Set-Up & Calibration Guide
CV #305529 05/08/10 07:27 PM
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Corner traps are not effective much below 100Hz, so I would think you could do both without penalty.

This assumes you can fit both in the corner. I'm not sure how well that would work with 4 EP800s.


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Re: Multiple Subwoofer Set-Up & Calibration Guide
fredk #305530 05/08/10 07:33 PM
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Very true. That could intrude into the room quite a bit. I imagine my room wouldn't allow that sort of configuration. I was asking mostly out of curiosity. I'm still looking at doing the four mid-walls. Even if it's not the most efficient, I don't think headroom will be a problem with four EP800s.

Re: Multiple Subwoofer Set-Up & Calibration Guide
CV #305531 05/08/10 07:36 PM
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I think you are right with that, CV. Four of them shouldn't be straining at all. I still like the idea of mid-wall placement (or close to it) to minimize standing waves.


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Re: Multiple Subwoofer Set-Up & Calibration Guide
St_PatGuy #305532 05/08/10 07:41 PM
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The corner placement is to maximize standing waves (or at least excite all the room modes with the least amount of energy). Then you can use what ever means to trim the worst peaks down, be it electronic or physical.


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Re: Multiple Subwoofer Set-Up & Calibration Guide
St_PatGuy #305589 05/09/10 02:51 AM
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Sean, mid-wall placement uses the two techniques for lessening the effects of room modes(placement at points where the mode is at a minimum or placement where they're opposite in polarity and cancel)in combination. For example, mid side walls are at length mode minima and width mode maxima(but the opposite side wall is at the opposite width mode polarity). Corner placement is at all mode maximum points and uses the fact that the longitudinally and/or diagonally opposite sub is at a point where the mode is opposite in polarity to cancel the effects.

The two placements are similarly effective as to evenness of response, but the corner placement leads to a higher sound level per sub being realized. Note again the comments from pp. 226-227 of the book where Dr. Toole states that a two mid-wall placement with two subs co-located at each spot(and therefore strengthening the mid-wall output)was by a narrow margin the best of the options for a four sub placement.


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Re: Multiple Subwoofer Set-Up & Calibration Guide
JohnK #305592 05/09/10 02:55 AM
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*searches for the light bulb icon*

Thanks, that makes more sense now!


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Re: Multiple Subwoofer Set-Up & Calibration Guide
JohnK #305593 05/09/10 02:57 AM
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I wouldn't mind co-locating two EP800s on opposite mid-walls, but then it kind of defeats the justification for me getting two more EP800s. I was keeping the horizontals in anticipation of using them on the front and rear walls, where they would fit the best. The verticals, on the other hand, work better for me on the side-walls. If I was going to co-locate, then I would want all four as verticals to be placed on the side mid-walls. I suppose I'll try out both configurations and see how it plays out. If I end up wanting to keep them co-located, though, then the holes for the feet on the horizontals might bother me. I guess one way around that would be to have the horizontals laying down like they're supposed to and then have a stand of some sort elevating the verticals above them. Ha ha.

Re: Multiple Subwoofer Set-Up & Calibration Guide
CV #305596 05/09/10 03:14 AM
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Charles, of course that two mid-wall plus co-location option can use either the side walls or the front and back wall.

The co-located subs can either be stacked on top of each other(presumably better with the horizontals)or placed immediately beside each other(better with the verticals). Note that the strongest mutual support would be if they were turned so that the drivers faced each other and were maybe just 2" apart.


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Re: Multiple Subwoofer Set-Up & Calibration Guide
JohnK #305597 05/09/10 03:16 AM
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Could the drivers possibly hit each other that close?


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