Is Anyone Using Subwoofers the Same Size as Their Mids?

I use four 10" diameter subs in my system.

Depending on which speakers I'm using, my midwoofers range from 10" to 15" in diameter. 

In general, subwoofer drivers are optimized for subwoofer frequencies, and midbass drivers are optimized for midbass frequencies. While in many cases each "can do" the other's job, imo that's probably not going to be optimum.

Duke

dealer/manufacturer

This is from Earl Geddes’ Premier Home Theater that’s an extremely useful resource.  If you skip to chapter 11 he goes into wall construction.  In short, using a damping material like Green Glue or Liquid Nails when putting up a wall can be very effective, but using a damping material between two wallboards is even more effective.  Anyway, hope this helps…

http://www.gedlee.com/downloads/HT/Home_theater.pdf

What are the speakers you're using?

Thanks for the input. I have the tools to apply EQ with a calibrated mic and a DSP module. I’m not sure how far that will take me because I have some serious issues with the room. For example, if I bang on the drywall I can hear it rattle while it produces a super low frequency note of its own. What I need to do is screw down the drywall better and add insulation to the studs. I’m dragging my feet a little because I don’t really want to patch and paint all the screw holes and if I’m going to do that do I just tear down to the studs and build a proper wall from scratch? That’s probably the right answer. 

I use 6.5" drivers in my mains and they do put out a decent amount of bass, but I’ve also integrated with real subwoofer and the result was amazing.

The easy, correct way to go from here is to go as big as you can with the sub BUT use appropriate EQ tools like miniDSP or get an SVS sub with built in EQ. You are right that subs can create problems, which small speakers don’t, but a good EQ can clip the big mosters off so the sub can work correctly.

If you are unwilling/unable to apply EQ, then leave your set up alone as-is.  If you ARE willing to measure your sub and clip the excesses then I encourage you to go mainstream with a 12" - 15' sub.