Originally Posted by Looneybomber
You'd be better off building a few small enclosures for 8's or even 10's and stealthily place them in your room. Maybe some small under-couch subs?
Your couches must resemble park benches... mine certianly do not. No "sub" I can fit under one of my couches is going to put out any useful frequencies.
It gets done right or I wait a while and make much larger mains. I re-measured and there's not really enough room under the mains I have now unless they move substantially higher.
New mains could be smaller if there is less need for bass, and this would allow for them to move higher because the tweeter would not be as high as they are now. But one project at a time, and it's been 10 years since I last built a speaker, I'll stick to the easy project first (subs are simple, driver, sub-amp, sturdy cabinet, find best location with short FR sweep, adjust Eq if you have one, done... speakers involve testing baffles and crossovers, by doing lots of much larger frequency sweeps. Those two steps alone are more than an entire subwoofer project).
If there needs to be a hole, then I have to consult the "interior design engineer" (a.k.a. wife), and when I need to do that I end up using favors that can be used elsewhere... so you can understand the reluctance. But that's why I asked.
I imagine a hole with a fake furnace return is going to be the preferred option when compared with a sub cabinet somewhere in the room, however I'm guessing the truly preferable option that the interior design engineer will choose will be "yeah, we don't really need that do we?"