Low Pass Filter

Low Pass Filter recordings are auditory processing disorder tests. They are considered monaural low-redundancy speech tests (monaural separation closure-MSC) sensitive to brainstem and cortical lesions.

Auditec provides a choice of tests and cut-off frequencies. 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. NU-6, PBK-50 and WIPI tests have been low pass filtered. Data for ages 11 and up are available for the NU-6 versions only. The NU-6 Low Pass Filter at 1kHz includes data for ages 7 and up. Each word list and filter is sold separately; therefore, it is necessary to specify the word list name (NU-6, PBK, or WIPI) and filter (500, 750 or 1000 Hz) when ordering.

Low Pass Filter tests include a) audio recording, and b) instructions and word list. Data is available for the NU-6 versions only. The NU-6 Low Pass Filter at 1kHz includes data for ages 7 and up. The NU-6 at 750 Hz includes data for adults only. It would be reasonable to expect children over the age of eleven to test as well (or nearly as well) as adults. Available from Auditec,Inc. Call 1-800-669-9065 (from US) or 314-416-1050 (outside the US) to order. All prices in USD plus S&H. Free shipping is available to locations within the contiguous US.

NU-6 Low Pass Filter@500 Hz*; Item 169-5; Price $65.00

Recommended for adults NU-6 Low Pass Filter@750 Hz*; Item 169-7; Price $65.00

Recommended for children NU-6 Low Pass Filter@1 kHz*; Item 169-1; Price $65.00

PBK Low Pass Filter@500 Hz; Item 170-5; Price $65.00

PBK Low Pass Filter@750 Hz; Item 170-7; Price $65.00

PBK Low Pass Filter@1 kHz; Item 170-1; Price $65.00

WIPI 2nd ed. Low Pass@500 Hz, recording only, no pictures; Item 171-5R; Price $128.75

WIPI 2nd ed. Low Pass@750 Hz, recording only, no pictures; Item     171-7R; Price $128.75

WIPI 2nd ed. Low Pass@1 kHz, recording only, no pictures; Item              171-1R; Price $128.75

WIPI 1st ed. Low Pass@500 Hz, recording only, no pictures; Item            171-5; Price  $65.00

WIPI 1st ed. Low Pass@750 Hz, recording only, no pictures; Item            171-7; Price $65.00

WIPI 1st ed. Low Pass*@ 1 kHz, recording only, Item 171-1; Price       $65.00

*Email auditec.kb@gmail.com for an audio sample.

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