Its interesting but the same folks who brought us a $500 ethernet cable, Denon, don't seem to make a similar high quality power cord. You would think that they would have a model that smooths out power fluctuations through a tube fluffer that improves the soundstage and lifts the veil of indifference that smothers so many lower end audio products today.

Well all is not lost, it seems audioquest has just the product the OP needs to improve his 990 to the point of makeing those with unreturned 978 beta units envious. Audioquest NGR WEL Signature Series 6. Please read the glowing review comments this cable of cables has inspired.

Those with less decerning requirements can go with the lower cost Audioquest 10' NGR-10 power cord from the noted high end provider Best Buy