I have a real nice 4 plug Box ( Bloom Box ) made By Robert @ Ridge Street Audio..Comes with 6' Poiema P/cord..Wonerfull piece..Actually beat the set up I was using by quite a bit....For more info on exact internal construction check with Robert.....
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You might consider an Alan Maher Designs Quantum Reference Power Conditioner.
It will provide the extension you require, plus it will transparently filter your system's power (at least it does in my system).
Another option is a VH Audio Hot Box.