1. Inter-aural attenuation
FOR AC THRESHOLDS
40 dB usually considered minimum IA for supra-aural headphones.
For insert earphones: dB
FOR BC THRESHOLDS
0 dB usually considered minimum IA bone-conduction vibrators 1

2. Is cross hearing an issue for right and left ear AC?
Spreadsheet

4. Cross-hearing in bone conduction
Only a concern when there is an ABG in the test ear.
ABG of 5-10 dB not significant.
Cross-hearing for BC suspected when
ABGTE > 10 dB. 4

5. Is cross hearing an issue for right and left ear BC?