This PBK-50 test has been low pass filtered at 1K. The originator of this concept employed a 500 Hz low pass filter; but it is believed by many that a 500 Hz low pass filter is too difficult even for normal listeners and; therefore; tends to produce too many false positives.
AUDiTEC™ has; therefore; recorded three different low-pass versions: 500; 750; & 1000 Hz. Research with the NU-6 low-pass filters supports the belief that 500 Hz is too difficult; and indicates that the preferred cut-off frequency is 750 Hz. Please select the word list(s) and filter(s) that best suits your needs.
Recording time 9 minutes and 21 seconds
on Custom CD as an additional test: $45.00

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PBK-50, Low Pass Filter @ 1 KHz

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