oldhvymec +1
Or any other brand than the one you settling for. Read their two paragraph installation instructions. Essentially, place the sub in a corner which is usually the worst location for most rooms. Then reduce the volume until the sub doesn't draw attention to itself. (Said with great sarcasm) It's simple all right.
For perfectly acceptable and reasonably priced custom length interconnects go to Blue Jeans Cable or Monoprice cable.
The right subwoofer system will last longer than all your other audio upgrades. Well, unless low frequency becomes interactive and too much fun.