Mike what are the pros & cons of this configuration?
Thanks,
Jimmy:
When you put two identical subs right next to each other, either side by side, or stacking, they essentially become one sub with 6db greater output than a single sub. This is called co-locating the subs. In doing this, you now essentially have a mono sub, even if you're using stereo inputs. Depending on your room modes, etc. there will be very slight differences between stacking and placing side by side. Just by listening, you will be hard pressed to tell which is "better" . . . measurements will show a slight difference. Stacking has the practical advantage of taking up less floor space.
The co-located subs have the advantages of having the loudest clean output and being the easiest to calibrate and get sounding good. However, some folks prefer using stereo subs that are not co-located. Here, you may be able to get slightly smoother overall room response because you are loading the room from two different places. You will also maintain stereo bass all the way down the frequency spectrum. The disadvantages are that it is more difficult to "dial in" and you won't get the full 6db increase in ouput . . . more like 3-4db depending on room and placement. We should write a book about this one
