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<blockquote data-quote="Ivan Beaver" data-source="post: 140779" data-attributes="member: 30">Re: Infocomm???We measure subs with the mic and the speaker on the ground-so there is no reflection.Whole space measurements of subs are pretty worthless-in mine (and others) opinion.At the subs freq there is likely to never be a situation in which BOTH the sub and the listen are in whole space.Since at least the listener will always be in half space-then that makes half space measurements totally valid-because that is what will be experienced by the listener.True anechoic measurements down to 20Hz would require a HUGE chamber.&nbsp; And the results would not represent real world listening.My opinion is that loudspeaker measurements should be done in a way that represents information that can be translated into useful numbers that somebody can use to estimate actual product performance at a specific distance.Hence the reason we also do not measure at 1M (which would result in a higher measured number), but rather at 10M-so that can be back calculated to 1M, so THAT number can then be used to figure out SPL at specific distances.If we used the 1M measurement, then the numbers that would be realized at further distances would be low.The whole idea is REALISTIC numbers that can be used-NOT what looks good on a spec sheet to fool people and increase sales based on falsehood.</blockquote>

[QUOTE="Ivan Beaver, post: 140779, member: 30"] Re: Infocomm??? We measure subs with the mic and the speaker on the ground-so there is no reflection. Whole space measurements of subs are pretty worthless-in mine (and others) opinion. At the subs freq there is likely to never be a situation in which BOTH the sub and the listen are in whole space. Since at least the listener will always be in half space-then that makes half space measurements totally valid-because that is what will be experienced by the listener. True anechoic measurements down to 20Hz would require a HUGE chamber. And the results would not represent real world listening. My opinion is that loudspeaker measurements should be done in a way that represents information that can be translated into useful numbers that somebody can use to estimate actual product performance at a specific distance. Hence the reason we also do not measure at 1M (which would result in a higher measured number), but rather at 10M-so that can be back calculated to 1M, so THAT number can then be used to figure out SPL at specific distances. If we used the 1M measurement, then the numbers that would be realized at further distances would be low. The whole idea is REALISTIC numbers that can be used-NOT what looks good on a spec sheet to fool people and increase sales based on falsehood. [/QUOTE]

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