Yes it's true, pull them away from the corners, and closer to your two main speakers. Putting subwoofers in the corner will reinforce the bass alot, but not always in a good way when it comes to music. Also, depending on how deep your main speakers go, you might not want to crossover at 100hz. That is just my opinion, but it is a little on the high side and might color your overall sound, or make it sound sluggish and bass heavy...at least that's what I have found. Try crossing them over about 60hz as a starter. Then move up the xover point a little bit at a time untill the bass seems to blend with the mains. Of course you might be a bass-a-holic? in which case ignore all my advice, crank up the subs, and blow the walls down!
