Dual Center Channel Speakers !!!

[drumdrum]

I thought some more about the suggestions given here....

So - my sweet spot ( prime movie & TV ) viewing is "right on" regarding L&R channels...dead center between 'em and so forming that equilateral triangle ideal. Also ear level seated is right at height of Heils. Levels as set with my trusty RS analoge meter are + - 1/2 db.

Likewise - ear level seated is centered height-wise between the upper and lower center speakers ( here again I refer to the mid / high frequency Heils ) which lastly puts me dead center of my monitor.

Furthermore - I did some measurements from a point on a box i placed om the couch, to each of the four Heils - and after tweaking a bit got all four within 1/2 "

So I'm outside the near-field space if the two center ch speakers, but equa - distance. Upper Heil is angled downward 15 degrees, and lower is angled upward the same. L & R mains are toed in. Stereo subs sit adjacent just outside mains.

If I play with anything I think it will be toe in and pitch ( yaw ).

Any suggestions regarding those kind of adjustments ?

[02audionoob]

Sometimes perception varies from science. If I like it, I'd question how much validity there would be to scientifically disproving that it's good.

[drumdrum]

found this googlein' around -

Haas Effect Also called the precedence effect, describes the human psychoacoustic phenomena of correctly identifying the direction of a sound source heard in both ears but arriving at different times. Due to the head's geometry (two ears spaced apart, separated by a barrier) the direct sound from any source first enters the ear closest to the source, then the ear farthest away. The Haas Effect tells us that humans localize a sound source based upon the first arriving sound, if the subsequent arrivals are within 25-35 milliseconds. If the later arrivals are longer than this, then two distinct sounds are heard. The Haas Effect is true even when the second arrival is louder than the first (even by as much as 10 dB.). In essence we do not "hear" the delayed sound. This is the hearing example of human sensory inhibition that applies to all our senses. Sensory inhibition describes the phenomena where the response to a first stimulus causes the response to a second stimulus to be inhibited, i.e., sound first entering one ear cause us to "not hear" the delayed sound entering into the other ear (within the 35 milliseconds time window). Sound arriving at both ears simultaneously is heard as coming from straight ahead, or behind, or within the head. The Haas Effect describes how full stereophonic reproduction from only two loudspeakers is possible. (After Helmut Haas's doctorate dissertation presented to the University of Gottingen, Gottingen, Germany as "Über den Einfluss eines Einfachechos auf die Hörsamkeit von Sprache;" translated into English by Dr. Ing. K.P.R. Ehrenberg, Building Research Station, Watford, Herts., England Library Communication no. 363, December, 1949; reproduced in the United States as "The Influence of a Single Echo on the Audibility of Speech," J. Audio Eng. Soc., Vol. 20 (Mar. 1972), pp. 145-159.)

The thing I found that "hit home " was sounds arriving at the same time are perceived as coming form directly in front, directly behind, or

(((((((((((inside the head))))))))))))

( at least now I know why I hear voices all the time )!!!!

[drumdrum]

http://en.wikipedia.org/wiki/Air_Mot...r#How_it_works

[drumdrum]

Explores the principles and practical considerations of spatial sound recording and reproduction. Particular emphasis is given to the increasing importance of multichannel surround sound and 3D audio, including binaural approaches, without ignoring conventional stereo. the enhancement of spatial quality is arguably the only remaining hurdle to be overcome in pursuit of high quality sound reproduction. The rise of increasingly sophisticated spatial sound systems presents an enormous challenge to audio engineers, many of whom are confused by the possibilities and unfamiliar with standards, formats, track allocations, monitoring configurations and recording techniques. The author provides a comprehensive study of the current state of the art in spatial audio, concentrating on the most widely used approaches and configurations. Anyone wishing to expand their understanding of these cutting-edge technologies will want to own this book.

More details
Spatial Audio
By Francis Rumsey
Published by Focal Press, 2001
ISBN 0240516230, 9780240516233
240 pages

Hey - found this for $30 used @amazom

[drumdrum]

Helmholtz, Hermann Ludwig Ferdinand von (1821-1894) German physicist and physiologist who formulated the mathematical law of the conservation of energy (1847) and invented an ophthalmoscope (1851) [AHD] (An instrument for examining the interior structures of the eye, especially the retina, consisting essentially of a mirror that reflects light into the eye and a central hole through which the eye is examined. You aren't a real doctor without one.) Famous for his book, On the Sensations of Tone first published in 1862.

( If I (eye) could just find one of these maybe I could see inside my head *&)&*()*&^ !!!)