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I'm assuming you want column 2 * 75 / 2100 ?

awk -v a=$a -v b=$b '{ print $1, $2, ($2*a)/b; }'

awk -F"[:[]" 'NF==1{print ; next}{if($2<14&&$2!=""){$0=$1":"$2"[dB]"; print $0}} ' input_File

Ok let's make it work : go in ksh first!

ksh
Then retry with nawk or /usr/xpg4/bin/awk (but not simple 'awk')

nawk -v N="$(( $(grep '>' yourinputfile | wc -l) ))"...