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Nice setup Gerry :^)
Mirage is nice; good stuff. Yeah, like you need a 12" Klipsch sub in that room! Yeesh.
20x20 is like what, 400 square feet? A good sized room by any standard...
However your bass will still be limited by your acoustic coupling to the room, in other words you might achieve more bass from just your front L & R in a different room, maybe larger or more rectangular.
You need some more physical distance between the listener(s) and the bass source, more is always better (no matter how big your home is!)
But challenging in a fairly square room.
The sub will just enhance the bass, the concussions and thuds - it's a different kind of bass isn't it?
Your acoustic treatment of the room will be very important, and make the difference between sound that is great and sound that's really excellent :^)
All the standing waves and reverberations and phase-cancellations in your room, with all that firepower, are the challenge for you - how to make your room acoustically larger while of course remaining the same physical size.
Treble I expect would be plentiful in your theatre, through point-source; meaning anyone there probably has direct line-of-sight to tweeter(s).
Mirages are not 'beamy', they spend a lot of attention on wide, even dispersal and that's why you pay $$$ (it's not for the laquer finish they use - well that too, but it's not what's important with eyes closed...)
But what I mean is, with tweeters within line-of-sight you can make the room much larger acoustically, without losing highs.
Stuff that room with plush; heavy carpet, plush furniture, heavy drapes. Have your room 'scoped' (WTF, treat yourself - you deserve it). Apply commercial tube-traps to any problem areas identified; they are nice looking and presentable these days, and very popular with the modern decor (what I call the 'Scandinavian' style, bare walls, slender furniture, hardwood floors etc.)
Hey it's no coincidence movie theatres are still all plush red velvet, cushy and acoustically 'dead' even these days...
It creates good sound, enhancing channel-localization and allowing the volume knob to become the bass control - letting the system breathe a little more, work a bit harder.
So I say you got good advice! But not much specific about how to achieve it...
You've got the goods there; tuning the room, the environmment, are where you will find the full 100% of the experience you desire.
The investment would be relatively slight, you've come so far and are almost there...
L8R
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