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| bass frequency (звуку) | |||
| low frequency (Maxym) | |||
| low frequency (від 30 кГц до 300 кГц) | |||
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| low frequency (30 kHz - 300 kHz) | |||
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низька частота : 14 phrases in 8 subjects |
| Aviation | 3 |
| Communications | 1 |
| Computers | 2 |
| General | 1 |
| Information technology | 1 |
| Military | 4 |
| Physics | 1 |
| Technology | 1 |
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