hum in sound from Pi, using dc to dc step down converter, what do you use

[lunarkingdom]

Hi,

I am using dual 3 watt amplifiers to power 4 speakers, to power the entire setup (5v Pi, 5v monitor and 5v dual 3 watt amplifiers) I am using a dc to dc step down converter, in a project previously using similar technology for sound I was told to use one of these on the power to the amps:

[lunarkingdom]

just ordered 12 pieces of Power Magnetics Radial RF Chokes 1000uH (1mH) , 300ma, 1.5Ω I was told to use 1 to 4 in parallel on the positive leg out to get rid of the noise from an electrical engineer I know. I will add one at a time till the noise goes away.

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