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In Reply to: vertical dispersion question posted by chocolate_lover9999@yahoo.com on March 10, 2007 at 22:26:36:
As an example, a typical stand-mounted monitor/bookshelf speaker with 6.5" woofer below tweeter, tweeter centered at 36" height, listener at 36" height and distance 96" from speakers, experiences its first floor dip at 331 Hz, followed by subsequent peaks and dips. Thick carpets and rugs can attenuate upper midrange and treble reflections, but offer little attenuation at this low frequency.Some 3-way tower designs try to reduce the floor reflection dip by placing the midrange high (sometimes above the tweeter) and woofer very low, close to floor. Doing so causes the woofer floor reflection dip to be pushed up in frequency and the midrange floor reflection to be reduced in frequency. Then, the woofer-midrange crossover frequency is carefully selected to be below woofer-dip frequency and above midrange-dip frequency.
To further reduce floor reflections requires more radical, unconventional designs. The Gradient 1.3 is a famous example. Another option is to use multiple drivers in an array (MTM's offer little floor-reflection attenuation).
Follow Ups:
Is it gonna sound weird on speakers that attempt to eliminate this room artifact ?
Also, keep in mind headphones have no floor or room reflections.
That is a difficult question to answer. In studios often several speakers are used during the mix: A small pair on the top of the mixing console and a larger pair built into the wall (soffit mounting). Other studios will just have one large pair on the console.For the pair situated on the mixing console, the time of the reflection off the top of the console will be much earlier (with correspondingly higher first dip frequency) than a typical stand-mounted or floor-standing speaker in a living room.
Of course, then this raises the argument about replaying the recording in one's home which is not the same electronics, speakers, room, etc. as the studio used for that particular recording. The sound at home will never be the same as at the studio, let alone all studios!
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