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63.16.5.181
In Reply to: RE: I've been looking for pics. Didn't Monster Cable also promote a similar product? posted by Enophile on June 15, 2008 at 17:10:31
Yes I distinctly remember Monster had a tall but fairly thin acoustic panel designed to be placed right against the wall behind the speakers, This was circa 1982 or thereabouts. It did work, but looked a little funny so most listeners tended to shy away from it, I guess they were ahead of their time.I personally run Room Tunes double stacked between my speakers, however, finding that placement line of sight between the speakers significantly helps the center image. One would think other wise but I run a double pair spaced roughly about 18 inches apart and angled at 45 degrees to the center line. I started with one p[air and noticed the center focus had sharpened considerably but at the lower vertical levels, raising the panels raised the center focus in the vertical plane.
While situating the panels forward and aft of the line defining the face of the speakers still is effective, placement right on the center seems to be the most effective. I've wondered about the effect and with the room tunes have played around with angle of the acoustic panels.
I believe the mechanism is that by blocking the the 180 degree sound waves which will meet at the center point, you avoid the cancellation effects they can produce. If the sound waves meet at other than the 180 degree point there is reinforcement, not cancellation and the sound is reinforced.
Think physics of a pool table here. I suspect because no speaker system is absolutely perfectly matched at all volumes and frequencies, avoidance of the cancellation effects projects a smoother and more at able center image.
Carrying this thought process experimentally a bit further, I also began playing with little baffles on the front face of a speaker. Using a thin line of modeling clay or putty I sort of made a horizontal "dam" across the speaker baffle between the tweeter and the woofer (say a two way speaker for simplicity).
Moving that line of putty up and down while maintaining the horizontal placement can greatly change the relative balance of the two drivers. Moving it closer to the tweeter reduces the dispersion of the tweeter and increases that of the midrange. Moving it closer to the woofer increases the tweeter dispersion, even though the roll of putty may be only an eighth of inch in diameter. In all cases the reduction of the waves moving at opposition to each other across the face of the baffle seems to push forth the range where the drivers cross over.
I believe the mechanism here is simple physics and cancellation, however, not any psychoacoustic revelations.
Of course YMMV
Stu
Edits: 06/16/08 06/16/08Follow Ups:
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