Where can i purchase a power lead for my TRAKTOR KONTROL S4 MK2?

Hi there be vary carful with 3rd party power supplies. yes you will need to make sure it is the correct Voltage and Amperage and most important not to forget polarity or it could damage your Kontrol S4 MK2. I am not sure if native instruments are still selling those power supplies in the accessories shop etc its been a while since I last browsed lol , best bet is to get an original one second hand that way you don't risk your S4 MK2 going up in a puff of Smoke , also if you use a 3rd party power supply if the amperage is less than required you could get issues with the unit switching off etc I found out this with a Korg EA1 but once I pumped up the amps with another supply it was tickety boo, so this could be why your 3rd party power supplies are crackling and popping , hope that helps.