RTi12 bass

[jtgofish]

Maybe the woofers are wired out of phase.It could be that one of your speaker leads is crossed or that there is a factory wiring fault to one or more of the woofers.
Try wiring one of the speakers out of phase[reverse polarity] and see if the bass improves.
I have come across speakers that were factory wired out of phase[Japanese even]
To check this you need to take the woofers out and test them for phase with a small AA battery-Pos to pos neg to neg.If the woofer moves forward when the battery is touch connected then that indicates proper phase.

[Wireworm5]

the problem i am having is not the bass....it is beautiful.. but why do i have to crank up my reciever past 3/4 to get the bass im looking for...they do produce astonishing bass....but i have to really crank up my reciever.....WHY??????

I answered your question. Any one of those setting will give you lower bass output and you'll have to turn up the volume to compensate for it. If your receiver is like mine then my guess is that your speaker levels may be set low. You have to adjust the levels for each soundfield. So if your using a soundfield and the surround or center channel are at 50% then you'll have to turn the volume up.
Since you give us little information the best we can do is guess as to the reason.

[kexodusc]

Check your math again. Using the pi * radius squared formula for area, a 12" is equivalent to just under three 7" drivers.

I do agree with your comments about distance to wall and the overall effect of smaller woofers, no matter how many you have. My guess is that is a placement/listening position/room node issue. You tend to get nulls in the middle of the room. After having recently moved and fine tuned three systems for the best response, I have been recently reminded of the vast effect of both placement and room effects.

rw

It would be 3 if woofers were flat, not concave and had no surround or frame...not the case...my figures come straight from physical measurements I've made...if you're really interested, download some software like Unibox or WinISD and run the figures for yourself...it's anywhere from 4.8 to 6.2 by measurement, not all 12" and 7" woofers are created equally.