Mine sounds best to the left and slightly behind my left speaker,,thats a hard question to answer as every room may be diff.,,
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Ideally you should not be able to localize the sub (if you have the crossover and level set correctly), so trying to place it in between the main speakers isn't an issue.
A suggested technique is to place the sub at the listening position, play some bass music or test tones and walk around in potential sub locations to hear which one sounds best to you.
It's probable that you'll prefer the sub near a room boundary near the listening position. However, a front corner will excite many room modes and tends to give a fairly smooth response.
If you are running your main speakers full range, you will probably have a more difficult time locating a good place for the sub due to the interaction of the various bass sources.
You may find this of interest: http://www.mkprofessional.com/bass_mgmt.htm
If the Descent has an internal high-pass filter, you might try that configuration.
Trial and error. I found that moving my 80 lb. sub was a chore, but necessary. A Radio Shack meter properly compensated gave me a good idea about peaks and valleys in the frequency response. A small REL sub I have is designed for filling in below speakers running full range and setting the crossover to match the slope of your mains. Then you slowly turn down the sub volume until you can't really hear the sub. Most subs are turned up too much. It should be very subtle and "disappear". And, remember to have fun!!