If your room ceiling height is averaged to 9' you have just over 2000 ft^3 of space. That's a medium sized room for subwoofer application. For your room size and usage I would be looking at a ported sub, not sealed. The Monolith THX Select 10, which was just recently on sale for $375, would be a very good option within your price range of $500. Regular price on this is $499.99. I have this sub and also have the SVS PB-1000 and would take the Monolith if I had to choose. One other option with more overall capability that is slightly over your price target is the HSU VTF-2 MK5, which is $607/shipped. Good thing about the HSU and the Monolith is they also have the capability to operate sealed, so it gives you some flexibility you don't have with say the ported SVS PB-1000.
And you do need to make sure you find a spot in your room where the sub will perform well. Just picking a spot due to the room layout often isn't a prime spot for the sub to operate. Sub crawl will identify the good locations for the sub.
BTW, there is no pic attached to your post.
Subs>RBH I-12e, I-12. HSU VTF-15H mk2. Monolith THX 12(x2), THX 10(x2). XTZ 1X12. SVS PB-1000(x2). Speakers>JBL Studio 270/235c/230/225c. Sony CS3/CS8/CS5. QA 3020i/3090Ci, 2020i/2000c. Monolith Cinema 5bs. Polk RTiA1/CSiA4. Other Audio>Sony MDR-Z7m2,V6, XB900n,700,XB32,XB31. Sennheiser HD58X,HD4.50,PC37X. HiFiMAN HE4XX. Philips SHP9500. SIVGA SV004. SA HDTwo. HyperX CloudPS4. TB Elite AtlasAero. LG FH6,RK8,RK7,PK5. HK Onyx Studio4(x2).
Last edited by MIX_MASTER_ICE; 05-09-2019 at 05:37 PM.