I'm not familiar with Audyssey let alone their many versions.
There is no set formula for subwoofer/s setup and location since every room is different. Multiple units usually reduce the rooms nodes and can give the illusion of faster response as it relates to their locations.
Shortly after my Velodyne DD-18 I purchased two DD-12plus and for a short time I slaved the second 12 and the 18. The combination loaded the room leaving one node in an unused corner. The DD-18 was large and heavy and a bit of overkill so it was sold. A minor Room Optimization adjustment and the two 12s easily took up the slack of the missing 18.
Velodyne DD Plus provides six frequency bands between 0 and 200Hz eight parameters of auto or manual adjustment and six customizable presets. Along with the test CD your main speakers in room performance is visible and any sub adjustments are visually rendered via laptop.
There is no set formula for subwoofer/s setup and location since every room is different. Multiple units usually reduce the rooms nodes and can give the illusion of faster response as it relates to their locations.
Shortly after my Velodyne DD-18 I purchased two DD-12plus and for a short time I slaved the second 12 and the 18. The combination loaded the room leaving one node in an unused corner. The DD-18 was large and heavy and a bit of overkill so it was sold. A minor Room Optimization adjustment and the two 12s easily took up the slack of the missing 18.
Velodyne DD Plus provides six frequency bands between 0 and 200Hz eight parameters of auto or manual adjustment and six customizable presets. Along with the test CD your main speakers in room performance is visible and any sub adjustments are visually rendered via laptop.