Time Dilation, Part 2 Page 3

Time Dilation, Part 2 Page 3

If you missed <A HREF="http://www.stereophile.com/features/105kh">Part 1 of this article</A> (<I>Stereophile</I>, January 2005), or it has faded in your memory, here's a r&#233;sum&#233;. (Readers who recall Part 1 with crystalline clarity, please skip to paragraph four.) The accurate measuring of loudspeakers requires that the measurements be taken in a reflection-free environment. Traditionally, this has meant that the speaker be placed atop a tall pole outdoors or in an anechoic chamber. Both of these options are hedged around with unwelcome implications of cost and practicality. To overcome these and allow <I>quasi-anechoic</I> measurements to be performed in normal, reverberant rooms, <I>time-windowed measurement</I> methods were developed that allow the user to analyze only that portion of the speaker's impulse response that arrives at the microphone ahead of the first room reflection. MLSSA from <A HREF="http://www.mlssa.com">DRA Labs</A> is the best-known measurement system to work on this principle, and both John Atkinson and I use it in the course of preparing our loudspeaker reviews.

Time Dilation, Part 2 Page 2

Time Dilation, Part 2 Page 2

If you missed <A HREF="http://www.stereophile.com/features/105kh">Part 1 of this article</A> (<I>Stereophile</I>, January 2005), or it has faded in your memory, here's a r&#233;sum&#233;. (Readers who recall Part 1 with crystalline clarity, please skip to paragraph four.) The accurate measuring of loudspeakers requires that the measurements be taken in a reflection-free environment. Traditionally, this has meant that the speaker be placed atop a tall pole outdoors or in an anechoic chamber. Both of these options are hedged around with unwelcome implications of cost and practicality. To overcome these and allow <I>quasi-anechoic</I> measurements to be performed in normal, reverberant rooms, <I>time-windowed measurement</I> methods were developed that allow the user to analyze only that portion of the speaker's impulse response that arrives at the microphone ahead of the first room reflection. MLSSA from <A HREF="http://www.mlssa.com">DRA Labs</A> is the best-known measurement system to work on this principle, and both John Atkinson and I use it in the course of preparing our loudspeaker reviews.

Time Dilation, Part 2

Time Dilation, Part 2

If you missed <A HREF="http://www.stereophile.com/features/105kh">Part 1 of this article</A> (<I>Stereophile</I>, January 2005), or it has faded in your memory, here's a r&#233;sum&#233;. (Readers who recall Part 1 with crystalline clarity, please skip to paragraph four.) The accurate measuring of loudspeakers requires that the measurements be taken in a reflection-free environment. Traditionally, this has meant that the speaker be placed atop a tall pole outdoors or in an anechoic chamber. Both of these options are hedged around with unwelcome implications of cost and practicality. To overcome these and allow <I>quasi-anechoic</I> measurements to be performed in normal, reverberant rooms, <I>time-windowed measurement</I> methods were developed that allow the user to analyze only that portion of the speaker's impulse response that arrives at the microphone ahead of the first room reflection. MLSSA from <A HREF="http://www.mlssa.com">DRA Labs</A> is the best-known measurement system to work on this principle, and both John Atkinson and I use it in the course of preparing our loudspeaker reviews.

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