Thoughts on this question? Is there any reason not to use a bookshelf speaker from the same series as a center channel? If not, does it matter whether it's placed vertically or horizontally?
I have two Martin Logan Motion 15 bookshelf speakers already, and found another ML Motion 15 for sale at a decent price.
An article about center channel configurations on this site states, "Some users instead opt to just use a vertically oriented two-way bookshelf speaker. This can be a great option especially if the same speaker as the front left/right speakers is used."