Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Ponders to question

Posted by DragonEars (A) on April 22, 2015 at 00:34:24

In Reply to: Questions to ponder posted by unclestu on April 21, 2015 at 21:45:29:

***1. Signals cancel if 180 degrees apart. Isn't a mono signal essentially that? Shouldn't, say a strong vocal, carry equal amplitudes on both channels? That's what gives the center image, right?***

A mono recording played back on a stereo system is identical in both channels, therefore in-phase. Sentences 1, 3, 4 are correct. Sentence 2 is only true if one channel is out of phase.

***2.Sound waves not reinforcing? How do ports work on a cabinet?***

They do interact, but I was referring to what does or does not happen at the listening position due to blocking the interaction directly between the speakers. Also, speaker cabinet ports are for controlling the motion of the driver (changing it's natural frequency to achieve desired response), not constructive/destructive interference of sound waves.

***3. This tweak enables your BRAIN to combine the left Right signals. Now doesn't that occur with headphones? If so, why can't it work for speakers?***

It does work for speakers and all other sounds thanks to natural selection and our progenitors' roles as predator and prey.

***3. Decades of common knowledge? Yes, but my placement of the center panel corners facing forward is definitely NOT like a rack or cabinet. I am reflecting the separate left/ right signals back out into the room into the listeners ears, for the most part. Think reflectors in a concert hall.***

I totally missed thinking about the reflected sound. I was only thinking about the interference between the speakers. Your tweak reflects some of the sound that would have reflected off the far sidewall of each speaker and back to center and on through back and forth, losing energy and creating interference. I can see how it would focus the center image and lessen the confusion of those center crossing waves.

***You need not try it, BTW. I have employed this tweek for well over two decades noe. All I can say is that it works***

It is good that some still explore and ignore "common knowledge". Thank you.

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