ZOWEEEEEEEEEEE! What did I tell you! YIPEEEEEEEE! And I luv my Aerial three subs - they're all stayiing in my room!
You mentioned that when you were lookin' for low freqency info, only then could you tell where the SW12 came in. I assume you mean that you listened without the Aerial sub, then listened to the same track again with the Aerial sub, and WOWEEEEE, you realized all the info and vibrations added by the sub. Nifty, isn't it! The imaging, detail and body prickin' heart thumpin' bass increases disproportionately if you add more Aerial subs.
I have had a number of Audiophiles over listening to my setup including Aerial subs. Forum member Shaun Pressley has been over two months ago, with two Aerial subs both in front left corner (I wanted added LFE extension), and last week with three Aerial subs (the third going in front right corner), and Shaun volunterred what I had "heard" already from a few friends, that before he could at times if he thought about it "localized" the front left corner Aerials a bit, whereas now with the third Aerial sub in the right front corner he couldn't. Although I sort of liked the added extension with the second Aerial sub next to the first one in the front left corner, if I only had two of them, I think I would forgo the extra 3 dB extension (by having two Aerial subs in the same corner) and place them in opposite corner for smoothness). Of course, only my preference, from months of listening and experimenting in my room.
Your friend saying little info below 100 Hz shows his ignorance of the importance of the last several octaves. There's a lot of stuff down there.
"Since the frequencies are low placement is not an issue." Hardly. Now the Aerials are so musical that perhaps placement is not absolutely as crucial as with some other less musical subs. But placement is always crucial.
Placement in a corner will normally get you added extension due to coupling with more room walls and boundaries. Place the Aerial sub in your normal listening position, and then go around the room, with your head at about normal listening height, and listen for where the bass sounds best (measure with a Radio Shack sound level meter, and listen, and where the bass measures loudest but still sounds wonderful and clean to you) and this will give you places to try placing the Aerial sub.
Now I would say if you're already tired of moving the sub around and listening (heck, I'm tired of talking about it) just spring the bucks, get two, and put them in the opposing front room corners. I'm just kidding, because each room and system is different and what works for me may not work for you. (Typical legal disclaimer - what else do you expect from a lawyer???)
The Aerial stands provide additional mass and vibration control (see Barry Kohan of Bright Star Audio special guest thread at the AV Science Tweaks forum several weeks ago for discussion of vibrational damping under speakers and subwoofers improving performance) which will improve the sub sound some, especially with wood floors in particular. Get them! Their neat lookin, too.
THe surround corner nearby may be fine for placement. But a front corner may be better - especially when you are asking the Aerial sub to reproduce low bass on music, or music soundtracks for DVD, etc. The Aerial sub is so good that you have to really listen to localize low bass - but as your ear/brain improves, it is possible on occassion to localize from one Aerial sub.
You say you will probably get another Aerial sub. Good for you!
And as I suggested, for now, leave the Velodyne's out of the equation and just get familiar with the Aerial. If you add a second Aerial sub, do the same, and try both Aerial subs in the same corner vs one in each front corner, among other configurations which can drive you crazy and your arms tired and weak. Once you settle on your two Aerial sub configuration, then try connecting your Velodyne subs, for LFE only, and place them in the corner next to one of the Aerial subs. Of course, as you add subs to the mix, you will need to readjust the subs volume!
By the way, using my five Vandy subs (high pass filtered bass only 50 Hz 6 dB) and three Aerial subs (high pass filtered bass and LFE), I've adjusted the volume level on all of them so that the Vandy subs alone are about 4 dB higher in loudness (this only applies to non-LFE since Vandys don't play LFE Stuff way I have them setup); Vandy and Aerial subs combined for non-LFE stuff remain 4 dB higher (with rear Aerial sub volume set at 1/4 and front Aerial remote volume set at -10 which is all way down); for LFE stuff and most music and non-LFE, now that I have three Aerial subs, I usually leave the front Aerial volume at -5, which translates to about a 7 dB higher overall Vandy and Aerial sub level than the corresponding Aerial speaker, again prior to LFE in Aerial subs only. (Previously with two Aerial subs I was setting the front Aerial volume at -5, but it just was too overwhelming with my ears actually starting to ring and hurt from the reality of the explosions.)
I hope you enjoy all of these ideas. Now go play!!!!!