What 400k?? 250k is enough for full range, try and you will see. But smaller inductor can be used at 400kTekko said:Terrible layout can also cause ringing like this.
Also you need to increase the switching freq to atleast 400KHz to be able to play fullrange satisfactory, at just 170KHz, the power bandwidth makes the amp drop off in audio level as you hit just a few KHz.
Another improvement would be making it self oscillating, like UcD, SODA or SODFA, clocked designs are usually only used in car bass boosters since EMI tend to be much higvher than self oscillating.
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