Given that the total 8W of power from TAS2120 boost is shared across TAS2120 and TAS2320, the analog gain of both amplifiers must be reduced such that the total output power is not overloading the boost. For example, when using 8Ω load on both amplifiers, the analog gain (AMP_LVL on register 0x07 at page 0) needs to be set to 15dBV or lower. Similarly, for 4Ω loads the analog gain need to be set to 12dBV or lower.

The gain allocation explained above is considering the worst case where both channels are playing the same signal at full volume, which is not very common for most audio content being music or dialog tracks. This means the gain can be increased in most cases.

For best results, gain needs to be fine-tuned based on the application requirements, speaker sensitivity and intended playback content.