Best place to put a single subwoofer?

For high end 2 channel systems, my experiences have always lead me to a pair of matching subs, as opposed to one, set up equally from the listening position as are the mains. Of course, serious time and tweaking are expected for good to excellent results.

Hello,

For a single sub in a 2 channel setup the proper position is between the L/R speaker center front.

regards ,

You folks are all great! Thanks so much for all the input. Now my head is SPINNING! Oh where to start? Sounds like I have a few projects that lie ahead. In response to Mrdecibels input- I used to have stereo subs, (Von Schweikert Towers of power), And they DID mate very well with my Martin Logan Quest z's, but they didn't have that hard hitting "slam" factor I love. I suspect the MBL's would overshadow them alot. I have since sold the VS subs.
I HAVE given consideration to selling my JM Lab/Focal Utopia sub and perhaps replacing it with a couple of JL Audio subs. However, I want to optimize what I already have. I want to arrive at some type of solution to my current situation...and not just throw MORE MONEY at the problem, or buy more stuff. I have done that already. Gone through subs like Charmin toilet paper (15 different subs owned, and sold in the last 15 years). Don't get me wrong, my sound is KILLER right now. I just know it can be better. It's that never-ending Audiophile quest to improve what we hear. Kinda like a drug addiction if you will. I know there are many variables here, and I recognize the differences between MY system, and those that MBL sets up in hotel rooms at CES each year. The 101e's absolutely slam. The bass is powerful and punchy. I LOVE that stuff. My bass is....NOT SO MUCH. Kind of "lacking" in authority. A bit "soft" if you all know what I am getting at? So I have been disappointed. I am clearly looking for a much higher leval of quality in the bottom end.
I do not have any testing equipment, or room equilization software. Not yet. I do have one of those cheapo Radio Shack sound leval meters-works alright I guess? I have in fact moved my sub all around the friggin' room, and discovered where NOT to put it, (cause it integrates like shit). Maybe my listening room is too small? Maybe I have "over damped" it with sound absorbtion stuff? Maybe my expectations are too high? Nah! that's not it. Things can ALWAYS be better.
I will no doubt continue to try and improve upon what I already have. Anybody want to come hang out for the weekend? I'll buy the beer! I have some great Scotch and fine cigars too. I'll order pizzas and you can impart your Audiophile wisdom upon me, help tweak my set up, and then lounge around all weekend long and listen to tons of great music! No shit! I would do that. The learning experience continues. Thanks everybody for all your advice and input so far!

Martinmobile, what is the rest of your system ?, amp/equipment, etc. My experience with MBLs have always been with Krell monos, and, a Crown Macro Reference. They love lots of power and lots of current, especially at a louder volume. I am not sure what spls you are trying to get, but you should use you Radio Shack meter and find out. Maybe you are taxing the MBL's to beyond their limit of staying clean and controlled. What are the panels you had built made of. They might be sucking out some of the bass punch and slam. Do you have dedicated outlets for your amps/equipment ? This all makes a huge impact (no pun intended) on what you are looking to achieve. I also want to add that sub woofer matching and set up is one of the hardest things I have encountered in all my years in this hobby. No offense meant in anything I have stated. MrD

MrD, no offense taken. At this point in time I am sponge and I am open to all input, suggestions, questions.
My system is as follows, (and is a mulligan stew of stuff):
Amps: B.A.T. Vk600se monoblocks (solid state) 600w/4ohm
Preamp: B.A.T. Vk51se (tubed)
Digital: Theta Digital Carmen 2 transport
Theta Digital DSpro Gen.5a dac
Analog: Linn Sondek LP12 w/Akito arm & Linn Adikt m.m.
PS Audio GCPH (solid state) Phono pre
F.M.: Magnum Dynalab MD102 tuner
Magnum Dynalab MD205 "signal sleuth" f.m. amp.
Speakers:MBL 101e Mk2's
Sub: JM Lab/Focal Utopia (Berrillium series)
Cables: All sorts of different shit. AudioQuest,Nordost,
Cardas,AcousticZen,Transparent. Some of it older
versions, but all of it either reference caliber
and/or top of the line in their respective brand.
(too many to list, too many to remember)

I have 5 dedicated 20amp circuits, 2 for the front end, 1 each for the B.A.T. amps., and 1 for the Subwoofer

The custom wall panels are 24"wide x 8feet tall x 3"thick (the frames that is). They are stuffed with "auralex-type" open cell foam that is 2" thick, then wrapped in in 1/2" thick batt insulation. The panels are then covered in a loose, open weave wool/polyester fabric. (Gotta look pretty for the wife. WAF is super important right?)

As for SPL's I am trying to "achieve"? Not particularly interested in any such maximum SPL's. Just want it CLEAN. And it is. Using my "hokey" little Radio Shack sound meter, it is entirely possible to reach a continuous 100db. NOT that I sit in the room and subject myself, or others to that for any length of time. But it will play loud as hell, as would be expected for MBL's. I have actually seen the spl meter hit 108 to 110db peaks. I know, friggin' crazy huh? (I don't know how entirely accurate a $35.00 Radio Shack meter is, but the sound pressure in the room is devastatingly "unbearable" at those extremes).
To reiterate my thoughts from earlier- it's really quite good. NO, actually it sounds KILLER. Just not KILLER enough, at least where bass is concerned.