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post #31 of 34 Old 12-16-12, 10:25 PM
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Re: speakers

The other fly in the ointment is crossover design. Different crossover designs will change dispersion, phase of various frequencies, transient response around the crossover point (the "Q" of the filter), and all manner of other complicated stuff.

Speakers are the most imperfect of our sound reproducing gear, by far. The reason "voicing" is not "baloney" is that every engineer/designer has to come up with a set of compromises that he/she finds pleasing with the drivers he/she has to work with. Also, the end product should please lots of other listeners, so that it will sell.

Basically, you can look at it this way -- Speakers are awful. Each driver has grossly non-linear frequency response when compared to digital players and decent amplifiers. The passive components used in speaker crossovers have all sorts of problems, especially the inductors ("coils"). It takes a really talented engineer to do a good job of taming ragged frequency response, unwanted resonances, etc. I have a ton of respect for speaker designers. They have to deal not just with electronics, they have to know their physics, and how that interacts with the electronics.

So, IMO... it really is a good idea to get a center speaker that matches the "tonality" or "voicing" of your fronts, so that they all sound of a piece, rather than having your center stick out like a sore thumb. Like, pretend you have a car driving from front-left, to center, to front-right. If the timbre (or "tone") of the center is much different than that of the fronts, you will hear the tone of the motor sound change as it goes across your sound field. That will call attention to the sound of your center speaker. The illusion will be broken, you'll feel that you're listening to three speakers in front of you, instead of a car driving from left to right in front of you. That breaks the spell for me.

--
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post #32 of 34 Old 12-17-12, 12:02 AM
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Re: speakers

Quote:
AudiocRaver wrote: View Post
Prodding at an older thread here, off-axis frequency response of speakers being the topic of interest...

What manufacturers DO publish off-axis response? Paradigm is one prominent manufacturer that does, Emotiva Pro does for their studio monitors. Any other that HTS-type-people are aware of? It would be interesting to start a list.
Quote:
DanTheMan wrote: View Post
Some pro JBL do. Geddes, linkwitz... That's all I know of.

I think there has to be more.

Dan
This is part of the reason I'm choosing to use JBL Control 25's as surround speakers in my (in progress) basement build. Very detailed polar response plots are included in the specification which seemed to indicate to me that they are well designed and engineered speakers, despite what many may say of the Control series. The built in speaker mounting system didn't hurt either...
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post #33 of 34 Old 12-18-12, 01:42 PM
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Re: speakers

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MagnusAtom wrote: View Post
Visiting some factories, I've seen some off-axis graphs, together with the on-axis. Though they aren't published for public viewing.

Harman group's speakers have those, and I understand if you ask, they may just send those to you.

Someone should build an anechoic chamber for rent for folks to lug their speakers for measurements! ")
I've done it, but haven't used it for that purpose. Plan on it when I get an opportunity.

Dan
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post #34 of 34 Old 12-22-12, 05:27 AM
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Re: speakers

As a continuation of the discussion on speaker directivity specs, and to create a resource list of manufacturers who specify directivity or off-axis response, see the Speakers with published off-axis frequency response specs thread in the Manufactured Speakers | Subwoofers > Home Audio Speakers forum. Please add any appropriate posts there. Thanks all for your contributions.

AudiocRaver

Last edited by AudiocRaver; 12-22-12 at 05:54 AM. Reason: added link
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