Witch amplitude on F5 entrance (calculation check)\ or preamp amplification for F5

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Hi
I just want to be sure about how much voltage I need in the F5 entrance for achieve max power to the speaker:

My PS produce +-30vdc, the F5 is 15db amplification so the amplification factor is 10^15/20=5.6.

Now if I want for example 25v on the speaker I need in the entrance Vin=25/5.6=4.5v.

if my DAC (audio source) produce 0.3v I need preamp with amplification factor of 4.5/0.3=15
Something like 20db
Please if I have some mistake or if I doing here something wrong tell me.
thanks
 
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