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Masking Matching
What are the OE values for 250 Hz, 500 Hz, and 1k Hz?
250 Hz = 15dB; 500 Hz = 15 dB; 1k Hz = 10 dB
What are the IA values for insert earphones?
125 Hz - 1k Hz = 75dB and 2k Hz- 8k Hz = 50 dB
What is the formula for masking using the Step Procedure for bone conduction?
AC(nte) + 20dB + OE
When should the Simplified Yacullo Method be used?
1) No A/B gaps equal to or greater than 15dB in either ear and 2) speech is presented at a moderate level (30-40 dB SPL)
What is the formula for masking using the Step Procedure for air conduction?
AC(nte) + 30dB
What is the formula for masking using the Plateau Technique for bone conduction?
AC(nte) + 10dB + OE
What is the Simplified Yacullo Method for masking for Word Recognition?
PL(te) - 20 dB
What is the Katz method for masking for Word Recognition?
PL(te) - 30 dB + Average A/B Gap(nte)
What is the formula for masking for SRT?
PTA (ac of nte) + 30 dB
What is the formula to decide if you need to mask for SRT?
Unmasked SRT(te) - Best Bone (nte) >40 dB (60 dB)
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