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Re: vertical dispersion question

Posted by Donald North (M) on March 12, 2007 at 15:37:06

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).

Donald North

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