Sup guys a lot of people on here know their stuff.

Well I got a question. I saw the dual bandpass box with the glass case and all for 90 bucks at best buy and I just had to get it. The two 12" subs themselves don't look so great, and I could be biased, but they don't sound too great either (then again I'm pushing them with a 100 rms bridged channel on my Clarion APA450). I just really liked the box and 90 bucks seemed cheap for the box alone.

My idea is to replace the subs with something that'll fit it adequately. Is the sound quality improvement even going to be worth it? Are there any subwoofers that I could fit nicely into the box? I've called the manufacturer but they don't know the specs of the box such as air displacement or anything (frickin idiots, all they have at tech support is the owner's manual). If anyone has any notion on this, I'd love to hear it. Thanks.

Here's what I know about the box: They are wired in parallel and 4 ohm nominal, so I guess that makes them each 8 ohms? They also are said to be 600 watts rms with a sensitivity of 89 db. The 4 ports each have a diamter of 4".