Looking to build four 18” permanent outdoor subs. They will be installed in a weatherproof cabinet with doors under an overhang. They need to be 8 ohms with waterproof cones. I prefer bass reflex enclosures. Box size and weight is not an issue within reason. They will be music only so I was thinking flat to 40hertz. Budget is around 350 per driver or preferably less. Sound quality is the priority. I was thinking something from B&C, Lavoce, PRV or others. Any suggestions on driver and box design would be great.