Hello noble 100,
"some systems use two subs, -is the integration of two subs easier, more seamless."
Hello changeout,
In most systems and rooms, I think 2 subs will provide better bass performance than 1, 3 subs will work better than 2 and 4 subs will optimize bass response to state of the art levels in virtually any system/room. This is assuming that all subs are carefully and properly positioned within the room.
In my experience, the more subs I've utilized in my system/room the more life-like, seamless, dynamic and effortless the perceived bass becomes. I've personally only used 1, 2 and 4 subs in my system/room and my statement that 3 subs work better than 2 is based on acoustic researcher"s experimental results along with numerous fellow members' reported experiences.
The proper positioning of the sub or subs within a room is required for optimizing bass response. I mentioned on an earlier post exactly how to position a single sub to attain optimum bass response at the listening seat. The same procedure is followed for each additional sub added to the system/room.
As the number of subs in a system/room is increased beyond a single sub, you'll notice the bass begins to sound better at more locations in the room beyond just the sweet spot.with sota bass response throughout the entire room existing once 4 subs are deployed.
Bass effortlessness, impact and dynamics also increases, as the number of subs in the room increases (when the subs are configured to operate in mono mode) since each sub is required to contribute a smaller portion of the total bass output.
Tim