Design criteria for an output LC-filter
You must consider the load, which the loudspeaker creates for your LC filter.
It changes the response of the filter.
Below are results of the simulation performed with LTspice for different
values of L and C (keeping almost constant the LC product):



As you can see, from the tested values
330nF, 33µH gives the best results (I have added this set of values basing on results of simulation).

\begin{array}{|c|c|c|} L &amp; C &amp; \text{color} \\
\hline
220\text{μH} &amp; 47\text{nF} &amp; \text{violet}\\
33\text{μH} &amp; 330\text{nF} &amp; \text{turqoise}\\
22\text{μH} &amp; 470\text{nF} &amp; \text{red}\\
2.2\text{μH} &amp; 4.7\text{μF} &amp; \text{blue}\\
220\text{nH} &amp; 47\text{μF} &amp; \text{green}\\
\end{array}

From the point of view of the loudspeaker (R1) we have a parallel RLC circuit. Its Q factor is defined by the formula: $$Q = R_1\sqrt{\dfrac{C_1}{L_1}}$$

For C1=330nF, L1=33µH the Q factor is equal to 0.8

The optimal solution will be the one, for each Q is equal to 1.