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What is the size of speaker wire if the distance between speaker and amplifier is less than 50 feet? 

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Furthermore, the result is valid regardless of the relationship between wire length and wire delay.
Therefore, narrow directivity of a speaker is necessary to implement the long range sensing using lower frequency signals.
Possible explanations are suggested for the failure of earlier studies to find a correlation between speaker height and the acoustic parameters of the speech signal.
Combining the 50 fold increase in efficiency with a 5 or 6 fold increase in power capacity, a single loud speaker unit of the type here described is capable of 250 to 300 times the sound output of anything heretofore available.
Such spectral distance measures are shown to provide significant performance improvement over conventional distance measures on the linear frequency scale in speaker verification in noise.
Experiments on a 50-speaker database show that the suggested weighted cepstral distance measure works substantially better than the Euclidean cepstral distance or the inverse variance weighted cepstral distance.
In particular, the speech-level model predicts physically-realistic decreases with distance from a speaker to a listener.
Finally, a close analysis of the speaker clustering results suggests that future research should investigate the effect of human acoustic radiation characteristics on the overall transmission channel, when a speaker is a few meters away from a microphone.

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