Originally Posted by hatrix216
May I recommend adding a DIY subwoofer section ? One for those who want to build their own box and really go all out on bass. These will in general be louder than any active subwoofer brands already recommended. Most subs are made to order (custom options you can choose, so most have build times).
I've been into car audio for years and know of the best brands. As I said, these would be considered "DIY" because you would have to make a box for them (to recommended specs), or buy a prefab box (NOT recommended unless its from DC creations or Khaotic Enclosures).
Brands of extremely high quality subwoofers:
Fi Car Audio (I personally run an SSD 18" in my car on 1200 watts @ 1 ohm)
Sundown Audio (I own a E8v3 for use in my room)
Digital Designs Audio
All of these brands have different classes of woofers to suit ones needs. SQ, SPL, or both. My SSD 18" back when it was bought 5 years or so ago was a little over $300 with shipping. My Sundown E8v3 was $95 shipped. I also have a friends Sundown Audio Zv.2 18" sitting in my room, a $500 subwoofer.
These are serious brands of subwoofers, especially their higher priced subs. They are LOUD when put in proper enclosures with correct power.
Do note, since these are meant for car audio, it's assumed you will be running these off of car amplifiers. It's plenty possible to use a plate amp, I did it for a while with my 18" in my room. However, chances are it's going to be underpowered, as you aren't going to find a plate amp that puts out 800 watts for cheap, let alone one that's rated under 4 ohms.
Don't disregard these because they are car audio, they are fully capable of being run in a home setup. You just need to know what you're doing