The Audioquest NRG-10, 4, or 2 will fit you can see them online at Needle Doctor.
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I tried Audioquest power cords on the Quatro with zero benefit in sound, I personally dont think its worth it, besides its below 100hz, what do you expect to hear anyway?
Its not going to make bass tighter or anything else IMO.
I am a firm believer in upgraded power cords, use them and have heard a gain in sound on many occasions but in this situation at these frequencies I dont see it happening, IMHO. Cheers