Originally Posted by Chu Gai
I'll have to ask the dogs what they think.
Why don't you have them sign up on the forum so that we don't have to keep going through the middlemen.
Might be nothing more than a quick bandaid, meatball surgery if you will. I'm sure if you asked him to remove them you could get a sense if it was an improvement.
I can tell you what it does by looking at it. It is there to make you think it does something when in reality does nothing. And if it did something, it would be bad (absorbing high frequencies only).
As to the center channel speaker, where would you put it?
I would put it on my head before putting it on top of a rambling sub causing it to buzz, rattle and heaven knows what else. Remember, the center channel in movies has the highest levels/amount of content in it. It needs to handle the most power and is the most critical speaker in the set up, not an afterthought as it is in the Hsu room:
And oh, the worst design for a center speaker is that MTM configuration pictured above. Why? Because you have two mid-range/woofers trying to produce the same signal so you get interference which gets worse as you move horizontally. See this graph on the left:
The solid line shows as you swing horizontally -- exactly what happens to center channel sending its signal to left and right side -- the response radically changes due to that interference. This is not good. Not good at all. Here is Dr. Toole on that set of measurements:
Two common configurations for horizontal center-channel loudspeakers. (a) The MTM design has
two “midranges,” which actually are woofer/midranges, that acoustically interfere with each other at increasing
horizontal angles. This is because they are physically separated, and both radiate sound up to high frequencies to
cross over to the tweeter....Recall that in Figures 16.6 and 16.10, it was shown that a horizontal dispersion of
±30 degrees was required for the center loudspeaker to deliver intact direct sound to all listeners in a typical home theater.
This figure shows that by 30 degrees this loudspeaker is experiencing heavy acoustical interference, and the output has
dropped seriously over a wide frequency range. This is not good.
I said it was no good, didn't I?
Any wonder then that the Joe installer who blogged about the video performance said the sound was no good? This may have been the reason.
What is the solution? The one on the right. Add a mid-range driver and you fix the problematic area. You get that nice horizontal response on the right.
Why are speakers designed this way when it is clearly a broken design? Because the marketing department says so. People think that is what the center channel is supposed to look like. If you are going to follow Mark's advice and look at these speakers, get one of the Left/Right speakers and put it vertically. Better yet, buy speakers that are not designed by marketing departments.
Your "random AV dealer"