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

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RE: Basically it doesn't…

Posted by zanash (A) on March 19, 2008 at 01:24:34

In Reply to: Basically it doesn't… posted by David Aiken on March 18, 2008 at 23:08:49:

in point 1 .....you appear to be saying that if you rotate the dirrection of the tweeter the first reflection point stays in the same place .....if you use the narrow beam torch analogy [most tweeters have a horizontal dispersion angle thats about 5 degrees before attenuation starts ] simply rotating the flash light will change the point at which it make its first reflection. I suspect you need to define tweeter axis are you talking about the axis of the voice coil ?

the simple way of finding a first reflection in the real world is to use a mirror and a helper ....the helper moves the mirror so that in your listening position you can see the reflection of the tweeter ...you then consider the angle off the voice coil axis your viewing the tweeter if it less than 30 degree the surface of the first reflection if hard and reflective deserves treating as this will be beaming out of phase sound onto your listening position....this will cancel [destructive interference] a proportion of the direct sound. areas to consider are floor wall and ceiling .....treat wall and floors with rugs and listen for changes ....its as simple as that....you don't need to know the maths

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