I recently purchased a sub from in ID company and a reputable one at that. Try to picture this:
This company makes a wonderful ported 15" sub which is 500w. They do not normally make one, but they built me a custom 15" sealed sub in a 20" cube, powered by the same 500w.
After dialing it in and messing with settings, and even talking to the company...I come to this conclusion: I am completely underwhelmed by the sub's output. During the opening scene of my first movie test, there is a a bass heavy passage right after the opening credit. During this scene, before I could even feel or hear actual bass, I heard the driver knocking as it was being over driven. Keep in mind my sub gain was 12:00 and my AVR sub level was set at less than zero. So, after dialing it in per the company's instruction, the sub is now set so it won't make that noise...which is awesome...except that now the overall output and volume is almost worse than my old Polk PSW505. Put simply, as of right now I regret not just getting a second Polk!
My question to you guys is this: What would make this sub behave this way? Over powered? Underpowered? Keep in mind, the company does sell sealed subs, which usually have more power than their ported cousins...but mine doesn't. I know sealed subs offer less output, but I've read in numerous locations that sealed subs also off the advantage of being incredibly hard to over drive because of the pressure and force being applied to the backside of the driver and it not being able to escape through a port.
My room is 21'x12'x8'
Any thoughts would be greatly appreciated!!!