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TPA3221: Is possible to set gain in other value?

KEN LU
Prodigy 30 points

Part Number: TPA3221

Hi there, we are currently using TPA3251D as 15V~30V battery power supply amp.  The gain is 20db fixed.  No problem at all.  Now we are try to use TPA3221 as 12V and above power supply.  But the gain setting are as 18, 24, 30 and 34db as specs.  My question is that is it possible to set it to as 20db?  So it will be compatible with our main board with the same preamp.  BTW, we use power amp as an independent board plugable to main board.  So the gain must be the same or very close in our application.

Thanks.