% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2024
\begin{circuitikz}[european]
    \def\base{2.0}

    \draw[ultra thick](1*\base,0.0)   -- ++ (0,3.0) coordinate(h1);
    \draw[ultra thick, DARCorange](2*\base,0.0) -- ++ (0,2.0) coordinate(h2);
    \draw[ultra thick, DARCorange](3*\base,0.0) -- ++ (0,1.5) coordinate(h3);
    \draw[ultra thick, DARCorange](4*\base,0.0) -- ++ (0,1.0) coordinate(h4);

    \draw[DARCred, dashed] (h1) -- (h1-|h4);
    \draw[DARCred, dashed] (h2) -- (h2-|h1);
    \draw[DARCred, dashed] (h2) -- (h2-|h4);

    \draw[DARCred, Triangle-Triangle] (h1-|h2) -- (h2) node[midway, anchor=west] () {$\Delta \geq \qty{60}{\decibel}$};

    \draw(5.25,0.0) ;
    \draw(1*\base,0) node[align=center, anchor=north] () {$f_\text{0}$\\1 Harm.};
    \draw(2*\base,0) node[align=center, anchor=north] () {1. OW\\2 Harm.};
    \draw(3*\base,0) node[align=center, anchor=north] () {2. OW\\3 Harm.};
    \draw(4*\base,0) node[align=center, anchor=north] () {3. OW\\4 Harm.};

	\draw[-Triangle](0.0,0.0) -- (9.0,0.0) node[anchor=west] () {$f$};
	\draw[-Triangle](0.0,0.0) -- (0.0,4.0) node[anchor=south] () {$A$};
\end{circuitikz}