i have emailed steve at krell and will relay his answer asap thanks !
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why is it that you need a long run of cable between a preamp and amp? i assume you have opted for shorter speaker cables in lieu of longer interconnects; if so, that's a wise choice. i use a 9 meter run of balanced cardas neutral reference between my pre and amp and 2 meter speaker cables. this configuration is greatly superior to my former one that used relatively short interconnects so that my electronics and digital frontend could be fit between my speakers. by moving everything but my largish amp (jrdg model 8) from between my speakers (avalon eidolons), i've added dramatically to the depth and width of the soudstage and increased focus and stability of the image. i've also tried long lengths (7 meters) of single-ended interconnect in another iteration of my system with some frustration due to rf and hum. unless you get good cable designed like the neutral reference to perform well in long runs, you may be adding a very effective and unwanted antenna with single-ended runs of more than 2 or 3 meters. in any event DON'T GET STUCK WITH ANY CABLE YOU CAN'T TRY BEFORE BUYING.
I am currently using a 12 Meter (40 foot) pair of Purist Dominus in single ended configuration. This length has been successfully driven by three different preamps with no apparent loss. The quality of the cable has a lot to do with this. All cable has a capacitance rating, and when that number get too high, the upper frequencies get lopped off. Dominus is less than 14 PF per foot.