Originally Posted by amirm
It is possible. Even more probable if you extend the definition of "EQ" to electronic correction (as in SFM). Here is a page from a presentation on RPG (Ethan's larger competitor):
That is for four subs at 1/4 positions into the room (i.e. ceiling mount). He goes on to cover other optimized positions from Todd Welti's paper which I also cite in my article.
Your room may differ from these simulations. Keith Yate's/JBL's simulation service can deal with that, computing the optimized number and position of subs for arbitrary rooms and construction. Alternatively or in addition you can use SFM which enables use of different subs and accommodates non-ideal rooms.
Unfortunately, the above post is almost fatally damaged by the lack of a proper reference and a total stripping away of context.
The full presentation may be found at
The above paper is rather dependent on and references the Todd Welti paper, unfortunately with what appears to be a broken link. The AES conference version of the paper appears to be freely downloadable from
(note: this link may break at any moment!, get it now!)
And with a little searching we find some information about the rooms that were involved:
The walls and ceiling of room 1 are constructed from
50-mm by 150-mm wall studs and two layers of 16-mm
drywall; carpeting covers a concrete slab floor. As a result
this room has significantly less damping than a typical
room. The room measures approximately 7.31 by 6.40 by
2.74 m. Room 2 is a dedicated home theater with a
dropped ceiling and 50% of the walls covered with 76-mm
fiberglass. This room, measuring 6.71 by 5.48 by 2.74 m,
has significantly more damping than a typical listening
room. Room 3 measures 6.71 by 6.10 by 2.74 m and is
typical in terms of construction and furnishing. It also has
a large opening into an adjacent room.
Most of the rooms were far from being free of acoustical treatments.Edited by arnyk - 10/12/12 at 9:17am