best 12 subs for small sealed boxes?

I need an expert here. There are some important calculations and rules to get a high powered sub that plays ultra low frequecies these daysin a small sealed box without adding an epicenter something like that. I've been told that the Kicker L7's should do the trick, but are there any other brands that are loud at frequencies below 40hz? I want 2-12" subs in a small sealed enclosure say 1.5 to 2 cuft per sub running around 400-600rms ea. Currently I have 2 12" diamond audio D3d2 and they are great for typical rap bass but some R&B songs I listen to go deeper than the subs want to let me hear. Songs like Money Maker by Ludacris, the bass is too low and I have to turn the bass way up just to feel a little of the the lows in that song.  It's like I need a booster at 20-30hz! I've read there are some things to consider like making sure if the sensitiviy range is low then the sub will need a small box and vise versa, higher sensitivity a larger box, along with the whole low & high QTS thing. Does anyone know of a couple good quality subs that might work for me? So far it's the L7 which I haven't heard yet and I'm looking at RE Audio but don't know how those sound. Thoughts anyone?

Huh?  That's a freakin' huge enclosure.

I mean D3's are decent entry level subs.  I would imagine the enclosure you're using probably has alot more to do with this than the woofers.  You'll find any reasonably sized sealed box won't have a whole lot in the way of .. I like this word .. 'subterranean' bass.  Notice heamph dictates two cubes per 12 for low extension on those TC1000's.  In relative terms, this is a very large enclosure for a single 12.

In your case, I think you'd be better off trying a new enclosure before blowing $350 on those woofers.  You clearly plan on a new enclosure anyway, so why not do that first?  Since you have some space to work with, why don't you try a largish ported enclosure tuned nice and low.. say.. 28hz or so.  You'll get that low-end extension you're looking for.. and if you find yourself still wanting for more, you'd have the enclosure already built for new subs..

Hey u da man, I appreciate it. I believe I will do the TC-1000 12's 4cuft sealed, I prefer the sealed sound but obviously will need mooor pawr to massage my back and pull dim lowz up atta the subterranean world! If I can afford it I'd really like a couple TC-2000's 12's and run 2 Hifonics Bx1606 for a total of 3200rms in some fantasy land one day. But it's nice to know that the TC-1000 can deal with up to 1000rms per sub.

Thanks!

My concern here is that you seem to believe the operating diaphram has more to do with frequency response than the enclosure.  This is *not* the case.  I notice, for a semblance of proof, you offer an anecdote from another forum. 

This probably had more to do with the listeners expectations than reality, *especially* if the enclosure didn't change along with the woofer.  Never trust an audio review from someone who just spent a few hundred $$$ on equipment.

The comparison between the home woofer and the car stuff is also a bit off given the way home theatre stuff is.. well.. enclosed.  Crack the 8" and you'll probably find a smallish transmission-line enclosure or a 5th-order bandpass or something.  This is why it doesn't use much power and sounds like it's so low... its properly enclosed.

Even heamph's postings reveal the nessecity of porting for ultra-low-end extension:

Look, building a massive sealed box just isn't the way to get what you are trying to get.  You'll get better frequency response, and IMO much better tonality, AND 3db if you port an enclosure that size to about where haemph is at..  23hz or so. 

If you don't believe me, which it looks like you are vested in not, head on over .. uhh.. here.. and do at least a *little* homework before sinking hundreds of dollars okay.

https://www.the12volt.com/installbay/forum_posts.asp~TID~74558~PN~1