Horizontal Center Channel Speakers and Why They Should Be Avoided

[tlmaclennan]

From what I can tell, most center speakers overcome the problems with option #3:

3. Placing the tweeter above the horizontal line of the midrange drivers such that an approximate 45 degree angle is formed will lessen horizontal lobing.

Though that's not to say all center speakers are designed this way. I'm just curious if it is actually recommended to go out and buy three of the same floorstanding speakers to be used as Front Left, Right, and Center speakers. I'm sure that this woouldn't be neccesary for the more high-end speaker lines, as their centers are probably designed well and matched to the fronts. But if I were to go with a low-end Polk line, say the Monitor 50s, would it be beneficial just to buy 7 of the towers to complete a 7.1 setup?