Power for Subwoofer

Hi all,



I am looking to install an active sub but need a place to power it from that will turn on and off with the ignition (instructions say to do this, I think it will prevent the battery being drained).



Also, there will be less noise in the system (apparently) if I take power straight from the battery. Can anyone advise what might be a good approach, considering the setup I just mentioned?



I was thinking of using a redundant fuse holder in the fuse box, but then am not sure where to get the power from that will meet a battery direct requirement. Is there a better way?



Thanks!

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