Need help placing a second subwoofer.


Need help placing a second subwoofer.

If indeed two is better than one, can I get some opinions of placement for both?

Anyone try putting the second one behind the listening position?

All feedback appreciated.

Dali Euphonia MS5 speakers. M&K dual 12” sub. The second sub is some semi lame 10”, but hell I only paid $5 for it at an estate sale. (Velodyne CHT-10)

Here’s a link showing a photo of my set-up:
https://imgbox.com/2x1C7zpd



[URL=https://imgbox.com/2x1C7zpd][IMG]https://thumbs2.imgbox.com/dc/d8/2x1C7zpd_t.jpg[/IMG][/URL]
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I always place them in stereo pairs behind and outside (if possible) the main speakers. This significantly extends the soundstage. You want the arrival times to reinforce the main speakers.
"...I always place them in stereo pairs behind and outside (if possible) the main speakers..."


Same except I put them on the inside.
place any subwoofer or subwoofers where they sound best as a first effort.  consult the owners manual.   making a nice "stereo pair"  looks nice and tidy but you may be wasting their potential.  usually subwoofers are recommended to be placed near corners for best response without getting too close to the walls to cause peaks in the response.  
behind the listening area is certainly acceptable as long as you refine the position by testing.  too close to walls you will hear an exaggerated peak (one note louder than the others, not good)  
pick your spot and then listen to see how it sounds.  too weak = too far from wall boundaries, too over powering, too close.  usually 12 inch from walls minimum.