Grasshopper says, "thank you all." After I posted my question, the Fed Ex guy rang the doorbell and it was off to the races. Without checking back on the forum, it was all about feverishly setting up the sub before my wife came home. I tried putting a flowering plant on the top of it, but she spotted the sub hiding underneath. It's that dang sixth sense, I tell 'ya.
The wife is somewhat bewildered by all this activity given the recent sales going on and why I suddenly need a "bunch of large speakers." Best thing she said after a while wandering about the room was that it sounded like a disco. I didn't have disco music on, but it was her way of saying that she was feeling it. So I must have done something right in setting up the sub.
My receiver is a Yamaha RX-V671, so I used its included Parametric room Acoustic Optimizer (YPAO); it's not Audessy, but it's okay; done it before. I took the cord out of my old Take Classic sub (The one that told me it needed replacing when I watched the Close Encounters Blu-Ray; the part where Richard Dreyfus has his first encounter by the train crossing), then stuck said cable into the LFM Plus.
I put the LFM-Plus volume knob on 5, selected max output (took out the port cork), bypassed the LFM-Plus crossover, then ran YPAO. YPAO in typical fashion didn't get the subwoofer's distance correct, so I overrode that setting.
I will have to check where to find out what crossover the Yamaha YPAO selected to see if it's 80hz. (thanks, Loft!) Saints, I don't know what Gain is, so maybe it's the volume knob that I set at 5?
By the way, this sucker is heavy.
Suffice to say, I unboxed the sub very carefully to salvage not only the sub, but my back muscles as well. I was blown away and gratified that my Auralex Gramma arrived just after the sub.
The sub having been put in place already, I had to re-place it atop the Gramma. A labor of love.
Anyhow, my feelings about the sub is impressed, but newbie wants to be sure. I'll do the sub trick, putting it in the listening position when walking around. I know one thing. When I went to one side of the sub while going to review a setting on the back of it, it was pounding out some guttural notes far deeper than heard from my present listening position. So, while cautious, I am optimistic.