What input sensitivity options are available and how do I select them?
The A4TI offers three input sensitivity options: 0.775V, 1V, or 32dB, which can be selected depending on the characteristics of your audio source. Sensitivity selectors are located on the rear panel for both CH1-CH2 inputs (item 8) and CH3-CH4 inputs (item 5).
From the official Dbtechnologies A4TI Professional 4 Channel Power Amplifier manual, page 3
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