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<blockquote data-quote="keep_hope_alive" data-source="post: 8381593" data-attributes="member: 576029">if you only consider specular reflections of smooth, hard surfaces (such as glass), then yes.&nbsp; many acoustics programs assume straight lines, or rays, for calculations of reflections because the math is easier.&nbsp; the frequency response of the reflection varies with the absorption and diffusion of the reflecting plane, which programs can also account for.in reality, consider that sound spreads from the source spherically - like waves in a pool.&nbsp; fill your tub with a few inches of water then drop a single marble in it.&nbsp; watch the simple spherical wave reflect and become chaos.&nbsp; that&#039;s what happens in a room or confined space with flat surfaces.&nbsp; you hear the first arrival which is typically the direct path, then you hear all reflections.&nbsp; each reflection varies in frequency response and amplitude.&nbsp; frequency response is determined by the polar response of the angle relative to the reflection and the absorption coefficients of the reflecting surface.&nbsp;&nbsp; as the source arrives at the reflecting plane, the resulting reflection varies in origin and spreads hemispherically.&nbsp; as reflecting waves interact with other reflecting waves the result is total chaos.in an automobile, what we can control is the frequency response and amplitude of the reflections.&nbsp; we control this with location and aiming of drivers.</blockquote>

[QUOTE="keep_hope_alive, post: 8381593, member: 576029"] if you only consider specular reflections of smooth, hard surfaces (such as glass), then yes. many acoustics programs assume straight lines, or rays, for calculations of reflections because the math is easier. the frequency response of the reflection varies with the absorption and diffusion of the reflecting plane, which programs can also account for. in reality, consider that sound spreads from the source spherically - like waves in a pool. fill your tub with a few inches of water then drop a single marble in it. watch the simple spherical wave reflect and become chaos. that's what happens in a room or confined space with flat surfaces. you hear the first arrival which is typically the direct path, then you hear all reflections. each reflection varies in frequency response and amplitude. frequency response is determined by the polar response of the angle relative to the reflection and the absorption coefficients of the reflecting surface. as the source arrives at the reflecting plane, the resulting reflection varies in origin and spreads hemispherically. as reflecting waves interact with other reflecting waves the result is total chaos. in an automobile, what we can control is the frequency response and amplitude of the reflections. we control this with location and aiming of drivers. [/QUOTE]

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