To be blunt there is cheap bass for let's say high school teenager budget - $100 3000w amp and $50 1000w subs
those cheap set ups give bass but it sounds like a garbage truck driving over speed bumps
you mentioned sundown audio - ok. Competition grade sub but you're pairing it with poop amp.
To successfully feed a sub like thsr you need clean strong power and good air space
look at cheater amps to save money if you must have good power but on a budget. The AUDIOPIPE apcl 15001d comes to mind. Look at its internals and watch the YouTube dyno.
I personally want out of the teeny brand equipment like audiobahn and kicker and seeked for middle ground. Like the american bass xfl1244/xfl1222 and the same amp as mentioned above. I would never turn back to my L7s or CVRs I had years ago
