Like so much of marketing "just put it anywhere" is a cruel lie when it comes to two channel stereo. In home theater, just hook the thing up and the receiver does the rest with a dedicated channel and a volume match. A little boom just makes the show more exciting! Not so with two channel.
I would be wary of a dealer who took your money and then wants to charge you for "fixing it". First, I would get on the internet (like you are doing} and get some basic information on set up procedure. Measure your room size and see what frequencies are most likely to produce standing waves. Cross over as low as you can and move up slowly. until the "hole" fills. A reasonable starting position is against the wall 1/3 the length of same.
I would be wary of a dealer who took your money and then wants to charge you for "fixing it". First, I would get on the internet (like you are doing} and get some basic information on set up procedure. Measure your room size and see what frequencies are most likely to produce standing waves. Cross over as low as you can and move up slowly. until the "hole" fills. A reasonable starting position is against the wall 1/3 the length of same.