standard horn mounted ported enclosures ? what are those ?
anyway, i don't think you will gain more than 3dBs by stacking the hwk.
stacking horns is a diffrent thing, because you increase the mouth area and, from what i read, you gain more than 3dBs

2 hwks with 2 subs will be louder than 1 hwk with 4 subs. isobaric doesn't increase spl.

id try a hwk at each end of the room for most even distribution of the bass.

[quote author=cutmoney  link=1150349602/0#4 date=1150379396]

What I mean is I currently have the subs in a standard front-loaded vented enclosure, like you would most standard woofer installs. I am planning on using these HWs for two DJ systems so I really have to put them in two separate boxes anyway. However, what I wanted to know is whether or not setting the two HWs right next to each other (when I want to run all the subs on one system) would produce a higher total dB output than setting them apart from each other.

I know that with the front-loaded enclosures like I am using now that you will achieve a 3-6 dB gain when they are sitting right on top or next to each other. What happens is the bass couples and basically acts like one massive subwoofer rather than each one working individually (as long as they are all in phase of course). What I wanted to know is if this is the same with the HW enclosures. [/quote]
Cutmoney, I've been using my HW's for two years now for DJ'ing. I dont recommend seperating the subs from my expierience. I've always had the best response with both subs upright side by side, center stage. I put them laying down with the large ports outward and any other way that you can think of. If you can boundry load, do so, but in the same configuration. Everytime that I play, I have to chase the Hw's out on the dance floor about every 1/2 hour. If you can keep them away from the crowd, try to do so. You would be amazed at what a Pat O's hurricane can do to two Peavey black widows.