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<blockquote data-quote="Frank Koenig" data-source="post: 58672" data-attributes="member: 416">Re: Pseudo-anechoic (windowed impulse) measurement on SmaartThank you Jason,The reason I am concerned with the ground bounce is that the physical arrangement guaranties that there is no earlier reflection (except off the tower, which is small in area and the therefor highly attenuated, I hope). It is the worst case. If I clip the ground bounce, then all later reflections are clipped, too. I think the difficulty with ad hoc modifications of the acoustic is that you don&#039;t know what effect they have since the speaker under test is unknown. You have to start somewhere, and, I suppose, if you&#039;re a real speaker company, that place is an anechoic chamber or a tall, skinny, and absorbent tower. Having said that, I acknowledge that a simple ground bounce is pretty easy to recognize and to verify by moving the mic a bit and seeing the effect. But it also blots out a range of frequencies you might be interested in.I know this is all old hat for folks who routinely do measurement. Thanks for indulging me. I&#039;m posting largely to get some feedback whether I&#039;m anywhere near the right track. And this is the DIY forum, after all.--Frank</blockquote>

[QUOTE="Frank Koenig, post: 58672, member: 416"] Re: Pseudo-anechoic (windowed impulse) measurement on Smaart Thank you Jason, The reason I am concerned with the ground bounce is that the physical arrangement guaranties that there is no earlier reflection (except off the tower, which is small in area and the therefor highly attenuated, I hope). It is the worst case. If I clip the ground bounce, then all later reflections are clipped, too. I think the difficulty with ad hoc modifications of the acoustic is that you don't know what effect they have since the speaker under test is unknown. You have to start somewhere, and, I suppose, if you're a real speaker company, that place is an anechoic chamber or a tall, skinny, and absorbent tower. Having said that, I acknowledge that a simple ground bounce is pretty easy to recognize and to verify by moving the mic a bit and seeing the effect. But it also blots out a range of frequencies you might be interested in. I know this is all old hat for folks who routinely do measurement. Thanks for indulging me. I'm posting largely to get some feedback whether I'm anywhere near the right track. And this is the DIY forum, after all. --Frank [/QUOTE]

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