The Velodyne FSX or FXR Servo 12 subwoofer is actually a very good subwoofer despite its age. Muddy output maybe due to its poor location within the room and/or poor setup procedure before and after your processors room correction was performed.
The corner placement suggestion that may appear in your subwoofers manual may be somewhat dated by todays standards and may have been given as a simplified placement suggestion. A modest investment in an inexpensive long pair of interconnects from someone like Blue Jeans or Monoprice cable would allow you to find an optimum placement location as well as learning where your rooms nodes are.
Another popular method is to place the sub at the listening position playing some bass heavy output while crawling around the room listening for the loudest bass (node). Then place the sub at that location and assess any improvement.
Home theater processors usually crossover the main speakers to the subwoofer at 80 Hz via the subwoofer outputs. Running the mains at full output (or large speaker) and the sub from an uncrossed over output manually setting the crossover point on the sub may be worth checking into.
The idea here is to experiment and experience what your current room and your subwoofers performance has to offer before investing in what might only be a marginal improvement.
The corner placement suggestion that may appear in your subwoofers manual may be somewhat dated by todays standards and may have been given as a simplified placement suggestion. A modest investment in an inexpensive long pair of interconnects from someone like Blue Jeans or Monoprice cable would allow you to find an optimum placement location as well as learning where your rooms nodes are.
Another popular method is to place the sub at the listening position playing some bass heavy output while crawling around the room listening for the loudest bass (node). Then place the sub at that location and assess any improvement.
Home theater processors usually crossover the main speakers to the subwoofer at 80 Hz via the subwoofer outputs. Running the mains at full output (or large speaker) and the sub from an uncrossed over output manually setting the crossover point on the sub may be worth checking into.
The idea here is to experiment and experience what your current room and your subwoofers performance has to offer before investing in what might only be a marginal improvement.