The NU-6 Low Pass Filter at 750 Hz© is an auditory processing disorder test for adults. It is considered a monaural low-redundancy speech test (monaural separation closure-MSC) sensitive to brainstem and cortical lesions.
The NU-6 Low Pass Filter at 750 Hz© includes a) audio recording, and b) instructions and word list. 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.
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NU-6 Low Pass Filter at 750 Hz© (CD Format); Item 169-7; Price $65.00 USD+S&H 
NU-6 Low Pass Filter at 750 Hz© (USB Format); Item USB169-7; Price $71.00 USD+S&H
⇒Auditec sells a similar test called the NU-6 Low Pass Filter at 1000 Hz for children.
Auditec, Inc. 
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