Q$2-$A$-$ Determine the overall TL value of a wall $(3m$ high by $6\mathrm{.}5m$ long$)$ containing a door $(2m$ high by $1m$ wide$)$ if the $TL$ of the wall portion is $45dB$ and the door is $25dB?(6$ marks$)$

Reduction in transmission loss $($TL$)$ of an assembly of two components.

$\backslash$table$[[\backslash$table$[[$Difference$],[$in TL values$]],$Area of smaller component as percentage of total area,,$],[50\%,20\%,10\%,5\%,2\%,1\%,0\mathrm{.}5\%,0\mathrm{.}1\%$