Jeff, I have pretty good ears (Mannes Cons. Grad - woodwind/reed player), and was sort of "blind tested", as my good friend likes to really shoot me down, see me fail these sort of listening tests, but I know what I hear and from where in the stage it eminates. I definitely knew the TG from the Elrod Sig3's(the "misty wet stage" the Elrod throws can't be mistaken from the more neutral Tg, let alone a standard 14g Belden)
Zargon, I am a big fan of BAlanced power. So I eveny your dedicated transformer! This may effect your listening experiences........ the system the 5A's play in have 4 dedicated 20amp 10g lines I helped install.
Now as to hearing, I do not know about you. I hear down low real well, as I am a true bass voice. I hear the origin and localization of low E on Double Basses, the low A on a Grand Piano (somewhere @ 32hz I believe???) and can locate some of the deep pipes of a pipe organ in various churches and concert hall's I have been in. I understand what most "studies" say, maybe I am an exception?, but I hear the focus of deep bass like I hear the focus of a viola section or trombone section in a Symphonie (when recorded well of course), again when a system is setup well. I have heard the effects of various isolation feet and racks effect this, both for the good and bad. Trust your ears. If you don't hear it, cool. If you do, and you focus on it, and can't get it right,..... oh boy, lord help you. Been there. LOL.
Oh, and that whole mono test, I wouldn't think it would do any good for stereo soundstaging when you are trying to get the bass to not be mono, but "Stereo Bass". If you have a recording of a bass player in a jazz trio off to the far left, he should soundstage like a tenor player might in that same locale. Low E as well as upper bass, as well as the body cavities of a double bass. Same for symphonies, if the double basses are back/rear of stage center stage (some London Symphony Recordings) they should sound like they are behind the woodwinds, Basson or Horns. Same for say the Berlin Philharmonic where their double basses are often recorded front far right and curl around to the rear right corner of the stage, that is where you should hear them.... Again, Low E on up... Ostinato's, or as counterpoint, .....
Then the hall info deep bass provides....... the size of the stage the the Tg and Elrod help provide.....the rear and side walls, the way the room might pressurize as at the time of the recording (the 5A's are a killer speaker....)..... all stereo bass issues.