subwoofers are omnidirectionall and could be placed just about anywhere. a corner such as your placement will result in deeper bass opposed to placement under a coffee table in the middle of a room. hope this helps.
In fact, if the sub works use it as an end table for your couch.
Just wire it up to the LFE ch, and if you have a phase switch or adjustment knob use it. Sometimes when the sub is in the back of the room you need to reverse the phase.
Place the sub where you want it, hook it up and set the levels.
All sounds lower than 70hz are non-directional (your ear cannot determine where the sounds originate). However, if the sub bass is causing rattles, these rattles are almost always higher than 100hz and very directional.
I have used my sub similar to your idea with no problems.
Uh-oh...about the crossover: I'm using a Harman Kardon AVR2000 with a fixed crossover at 100Hz, and mini-bookshelves with 4" woofers (JBL SCS178) that can only go down to 100Hz. So, I really have to make use of the 100Hz x-over on my receiver. In this case, where bass up to around ~100Hz will still go to the subwoofer, will it still be ok to place the sub as in my diagram?
Secondly, if I do this, I will have to plug the subwoofer directly to a wall-plug, w/o any surge protectors, while my receiver and source are plugged in a surge protector which in turn is plugged into the 2nd socket on the same wall-plug (whew!). Will this be harmful to the sub? Will this produce ground-loop humming/buzzing?
Thirdly, in case rear placement is not feasible, I can, as another option, place the sub near the front left speaker and also near the receiver. Is this all right; won't the vibrations from the sub, if in proximity with the left front and receiver, not case harmful vibrations on said speaker and receiver?
Subwoofers should be placed where they deliver the most balanced bass response. If that happens to be between the rear surrounds, fine. But because subs start to become localized above about 80Hz or so, and your crossover is fixed at 100Hz, I suspect the most pleasing results will be obtained if you move the sub toward the front speakers. I'd start in a corner if possible, then if necessary move it to achieve the best bass response.
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