Two Subs?

"If I could I would place a sub in the front Left or Right corner and a sub in the opposite corner on the rear wall."

That would very likely be a bad choice as both subs would be exciting the same room modes. One sub in one corner is good, but the second one should not be in the symmetrical corner. Moreover, about midway of a wall would be more advisable.

The best configuration in my room has been one sub in between the main speakers and the second sub in a corner, with the front or back corners showing almost the same results (albeit with different settings/adjustments).

BTW, just like there is no substitute for good speaker placement, the same goes for sub placement. Sure, room correction will make it better, but the least correction you need to apply, the better.

Cheers!

First the professional microphone which is used with Audyssey pro measures a lot more information compared to a standard Audyssey microphone. Second we measure at totally different places and hights compared to the Audyssey way of measuring. This gives a very big difference in how much dynamics and information you can measure. The roomcorrection of Audyssey is only 1/3 of the whole system. By using the parts Audyssey volume and EQ to the max the end results are a lot better. Without it I would have a loss in dynamics. And it would be more the same like other room acoustic systems. By using Audyssey pro with EQ and Audussey Volume the volume of the sub can be set so much lower than without. This gives you more control and more drive as well. We learned to use it differently to get the results we wanted. Using the sub till 140 hz makes the palpable integration so much better. People Always say and think; so you do not use the subwoofer? Ofcourse I use the subwoofer. When I put it have you see the eyes of the people move. Using it till 140 hz is only possible of the timing and fast respons of the subwoofer. Next step will be the very Soon outcomming pure silver Audioquest Wild Dog subwoofer cable.

Bo,

Audyssey requires that the subs be calibrated at 75db, IIRC. If you're using a pair of reasonably high quality subs, that requires quite a low setting, right there. The volume dials on my Rythmiks are set at the very low end of their range. I can't imagine going much lower.

I can even turn the volume of the sub quite loud without any problem. Calibrated at 75 db, the volume using with my measurment is a lot lower than with the Audyssey way. I use a Purist Audio powercable with 004 Oyaide. When we use a cheaper powercable. The volume will be higher as well. You can influence the control to the sub in many different ways. I know already that the new pure siver Audioquest Wild Dog will give a positive influence on the control of the sub. The Sub-3 from AQ also uses some silver. This made a big improvement also on the freq. from 60-140hz. Control and a better timing give you more space to use the subwoofer to his max. My Olive 06HD with also a Purist Audio powercable and a new Audioquest Wild Blue Yonder xlr gives with 132 db much more weight and drive to my PLW-15. A source with more weight and speed gives you superior control to your sub as well.