| BTE | behind-the-ear |
| DI | directivity index |
| HC | head covering |
| KEMAR | Knowles Electronics Manikin for Acoustic Research |
| NAL-NL2 | National Acoustic Laboratories Non-Linear 2 prescriptive formula |
| RIC | receiver-in-canal |
| RMS | root-mean-square |
| SNR | signal-to-noise ratio |
| SPL | sound pressure level |
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