DRV2700EVM-HV500: Reducing >1 kHz noise on piezo driver output (HD-PAF1419)

Tool/software:

I’m driving a HD-PAF1419 piezo actuator from an ESP32. The ESP32 reads an audio signal and, when a threshold is exceeded, outputs a PWM signal to TP1 to enable the amplifier.

When the PWM input is zero (disabled), I still observe noise on the amplifier output (OUT+ / OUT−) around 3–8 kHz, which produces an audible/physical buzz in the piezo. I want to attenuate frequencies above 1 kHz (the actuator operates up to ~500 Hz).

What is the best way to reduce this high-frequency noise on the amplifier output?