For the best audio performance, component selection is critical to maintain a flat LC filter frequency response and minimize distortion. The capacitor considerations section of the LC Filter Design application note has a detailed discussion of the key parameters and trade-offs for choosing a capacitor for high-power class-D audio-amplifier applications.

Multilayer ceramic chip capacitors (MLCC) are some of the most standardized components used in electronics today because of small size and low cost. This guide test data selected ceramic capacitors for automotive with optimized key parameters to minimize impact on audio and EMC performance. The capacitors selected have enough rated voltage on 45V, low ESR, and a desirable size to minimize DC bias voltage impact. Table 3-2 lists the capacitors that were used on the LC filter and tested on audio performance. Detailed ratings and specifications can be obtained through capacitor manufacturers for using capacitors safely in a system.