Passive soundbar

Looking to de clutter and move my current second system to become a third system and in doing so am looking to replace my pioneer elite Andrew Jones Dolby Atmos L/C/R towers and center with a passive sound bar being driven by marantz 7007 receiver. I have multiple zones and things hooked up so a powered soundbar is not an option. Guessing I will need to add a sub or two as well given physical limitations of the sound bar.  I have about 43” width and somewhat varying height and depth let’s say 6 to 8 inches high and 7 deep. Not looking to break the bank but doesn’t seem like there are many cheapish options out there.  Am I missing a quality speaker somewhere ?  Would like to keep under $500.