Lately, I've been pondering the addition of more sub(s) to help flatten out the lower frequency across all listening positions. I'm looking for recommendations on placement. In studying the Harmon papers
that JohnK frequently references, it appears 2 subs centered on opposite walls front/back is very good, as is 4 subs centered on all walls (more $$$).
I currently have an EP600 which does a great job, and I'm also using the Velodyne SMS-1 digital eq. From my primary seat I've created a very nice flat response (see middle graph). This graph was run with my SMS-1 mic from the primary seat in the front row. It was also taken before I made any adjustments to the eq, the end result was even better. However, running the sweep from other seats in the theater results in very different readings. This is why I'm considering the addition of another sub(s).
As most of you know I also treated my room with corner Bass Traps and first reflection Acoustic Panels prior to adding the SMS-1 to the equation. The addition of these treatments provided great results to flatten out my frequency across the seating areas (see bottom before/after graph). The improvements came after adding my front corner Superchunk Bass Traps. At this point I was using an EP500 and had not yet completed my wall/ceiling panels, or rear columns.
So, the question is where to place the sub(s), and which subs to get. As you can see from the below drawing, my right side is open into the rest of the room, which opens into a large hallway that leads you back to the bedrooms, bathroom, storage, etc. I only have that 6ft wall, so not sure placing a sub there would really be considered center.
The picture shows my EP600 below my center speaker and screen. In reality, it is currently along the left wall, below the first reflection panel, near the front left corner. This placement provided me the best graph using my SMS-1 from the primary seated position.
So what I'm thinking is to move it back below the center speaker as it looks cool there.
Then, get a second sub to place along the back wall, to the left of the walkout doors. I would put it below that back window, however, really don't have a way to get a coax cable around the door.
The way it is now, I will have to run one around the room along the left wall floor. I plan to daisy chain it off of the line-out jacks on my front ep600. At some point in the future I suppose I could get two more subs and place one as far out as possible on the 6ft wall to the right, then place another one centered on the left wall.
If you look at my seating arrangment, in relation to the overall roomsize, this is what is difficult in deciding placement.
Budget is a concern, and I'm thinking about getting one of the new EP350v3's for that back wall. The specs are pretty impressive. I could get two of them from the FO, for the price of one EP500. Or maybe just one 500 would be adequate and I would never need any further subs, it is just the price is pretty steep.
So, what do you all think? Sorry for being so long on this post.
ps: trying to save up for a 1400-8, so keep that in mind.