power supply - Help me hack this speaker, where would I introduce DC voltage

I have a speaker that runs off of AC (there is a switching converter within the speaker) I'm attempting to convert it to battery power, From my understanding the speaker runs off of 5V (someone else did a similar conversion). so here goes

1. Where would I solder a wire to run directly from DC. I'm assuming it would be after the switching mode power supply. Also I know that there is some conditioning going on there, so I'm not sure the implications of bypassing it.

Attached are photos of the unit

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