Hello. I'm using the TPA2013D1RGPR with recommended ferrites and 1000pF caps but the noise at the speaker output is enormous! 50% duty cycle, square wave at 290kHz 4.5Vpp with the input audio grounded (on the far side of the caps). With audio running, the amplifier works great, but on a scope, the audio is swimming in the same 290kHz noise. There is a great deal of ringing on the square wave as well. Although the speaker cannot respond to this frequency, there's some power being wasted and there is a white-noise static hum (very quiet) coming from the speaker. The audio inputs are AC coupled through 1uF, the battery voltage is filtered. I don't see any noise in the audio input. I have a 4 ohm speaker. Any ideas? I'm concerned this won't make it through EMC and may adversely affect battery life. I have SM712-TP ESD diodes on the speaker connector. Gain is set to 6 (float pin 3).