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-   -   Center channel with one mid (http://www.diyaudio.com/forums/multi-way/131432-center-channel-one-mid.html)

Buzzy 16th October 2008 06:38 AM

Center channel with one mid
 
I have always seen center channel speakers come with 2 midbass drivers and a tweeter. Is there any reason for this other than aesthetic reason.

Can i build a center channel with just one midbass and tweeter ?

pelanj 16th October 2008 07:31 AM

Of course you can - but you cannot place it on its side - the center speaker must be laterally symmetrical for best results.

BHTX 16th October 2008 10:27 AM

Nope, just aesthetics. In fact, it's actually very detrimental to off-axis response, much like a usual vertical MTM is, except with a center channel it's a lot worse because it's horizontal, so off-axis response in the horizontal plane will be affected instead of vertical. On top of all that, not only is it best to have the center channel identical to the left and right channels, but it should also ideally have good off-axis response anyway to cover the seating area of the room/theater. So, yes.. the common dual mid center channel with horizontal orientation is complete BS, and it only hurts performance. Strictly aesthetics.

And x2 what pelanj said.

Lynn Olson 16th October 2008 10:53 AM

Try listening to a monophonic music recording through a side-by-side MTM Center speaker (with all other speakers turned off). You will not like what you hear, and the sound will change a lot with small left-to-right movements.

David Gatti 16th October 2008 12:10 PM

Re: Center channel with one mid
 
Quote:

Originally posted by Buzzy
I have always seen center channel speakers come with 2 midbass drivers and a tweeter. Is there any reason for this other than aesthetic reason.

Can i build a center channel with just one midbass and tweeter ?


Aesthetically, a wide & low enclosure with symmetrical layout is the best, and having 2 midbass drivers also increases maximum output.
You will get lobing in the horizontal axis, but that can be mitigated with close driver spacing and a low crossover point.

A vertical MT gives the optimum horizontal axis performance, but then you can end up with a tweeter thats too high/low relative to the main speakers. Imaging may suffer. It also usually limits practical placement and can look a bit odd.

The optimum setup is 2 channel (as Lynn pointed out) IF you are sitting precisely between the L & R speakers. If not, a centre channel will probably give you a better image, and better vocal coherency.

My recent Oliver design is a compromise of all these factors.

Since you are the designer, you can choose the optimum tradeoffs for your situation. To start with, decide whether the centre-channel will be situated below or above the TV.

sdclc126 16th October 2008 03:35 PM

Alternate - a single 3" - 4" wide range driver with proper filtering (usually BSC & notch filter). Since the CC speaker is primarily for voice many decent wide range drivers will work very well to reproduce the range of the human voice. Simpler & cheaper design also.

Robh3606 16th October 2008 04:10 PM

"Can i build a center channel with just one midbass and tweeter ?"

Why not use a coaxial driver?? That's what I use and it works great.

Rob:)

sdclc126 16th October 2008 04:11 PM

Yes! I should have thought of that too - considering that's exactly what I used to have. :bigeyes:

Buzzy 17th October 2008 04:30 AM

Quote:

Originally posted by sdclc126
Alternate - a single 3" - 4" wide range driver with proper filtering (usually BSC & notch filter). Since the CC speaker is primarily for voice many decent wide range drivers will work very well to reproduce the range of the human voice. Simpler & cheaper design also.
I think this is a great idea but i don't know how it will match with my mission m32i mains.

I can't put the single midbass and tweeter speaker vertically as i am putting it on top of my projection tv. That will make it look weird.

BHTX 17th October 2008 06:58 AM

Rear projection CRT? I'm assuming there's some space underneath the screen then? Build a short stand, and put it there. :)

Make the stand so that the center speaker can be tilted back slightly if needed. If possible, and if necessary, move your left and right speakers out into the room a bit more, so that the center channel sits slightly farther back. It usually helps imaging, among other things, in regular stereo too.


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