crashguy said:
....sort of...
I wouldn't worry a whole lot about exact timbre matching. The simple fact that a dedicated center speaker (even from the same maker, in the same line) are designed to be placed horizontally causes them to be mis-matched as compared to their floor standing siblings. Also the placement of the speaker will have an effect on it's sound. Place a speaker on top of a TV, now it has a large surface for sound wave to defract off of, and this will cause a perceptable change in timbre.
I would pick out a center speaker you like, and as long as one is not a horn vs a dome, or a dome vs an electrostatic, you won't hear a degradation in sound by using a speaker from a different manufacturer. Sticklers may disagree, but I don't think it's a big deal. When was the last time you heard someones home theater set up and said......"wow Bob, nice system....too bad your center speaker isn't an exact timbre match with your mains". Buy one you want, and don't sweat it.
I guess I'm one of those "sticklers."
In my experience even speakers by the same
brand but from different
lines sometimes don't "gel" sonically. For instance, I initially tried a MA Bronze Center with my Silver mains, and they weren't voiced closely enough to satisfy me. The Bronze main/Bronze center combo was great, and the Silver main/silver center was fantastic. But mixing them with either of the other was disappointing.
One thing to note- while it's true that horizontal layouts will sound somewhat different, this can be mitigated to a great degree with proper design. MA, for instance, has a horizontal center, but the crossover is "2 & 1/2 Way"- the woofs each play different frequencies. This does a lot to eliminate "lobing." As a result, the MA centers do more closely match the mains than most brands.
One caveat- mine is not the normal layout. I have a projector, so instead of a big hulkin' box in to throw the center on, I have it sitting on a speaker stand. This makes an incredible difference in sound quality. Best thing I ever did to upgrade my sound was probably getting rid of my RPTV.