Good Copper IC's for 2.5M RCA pre to amp?

Synergistic Research Resolution Ref x2 active. I went to the RR x2 instead of the Venustas and several others for the body, imaging, midrange, and bottom end they possess.

You'll save some money in the process. other than the RR's I'd say try the SX Ltd. from Nirvana, above the SX's I'd say the Acoustic Ref active, also from SR. The SX's are the imaging champ of the lot however. Their ambient retreval is flat out scary.

Thanks guys so far.
Tweak1: Not sure how much signal loss is associated with a 3M run, but Vladamir at Lamm did not think that would be any problem with the LL2, and it certainly was not a problem with the CAT Ult MkII or my Lector Zoe. I am running from a cabinet to monoblocks positioned between the speakers, so 2.5M is my minimum, and I would not want to go over 3M. Unfortunately, virtually none of the tube preamps I have liked have single-ended outputs, since with my new Lector Digidrive/Digicode, I could run a fully balanced system if I found the right preamp.
Blindjim: I will look into those you mentioned, although I have no experience with either Synergistic Research or Nirvana.

Any decent preamp will drive a pair of 2M or 3M unbalanced cables easily and without loss of detail.

The post stating the contrary is simply incorrect.

I agree with Audiofeil. Any good IC, I have the Cobalt Cable ones currently but have used Kimber and many others, will make that run without problems. This assumes a good match between the pre-amp and amp concerning impedance.

Mitch2

Art Dudley wrote a pretty good (accurate) review of the SX Ltd. some time back in Stereophile, comparing and contrasting them to Nordost's Valhalla.

Bruce Richardson of Voodoo cables makes an Ultralinear cable comprised of both copper & silver and it was also on the top end of my short list prior to me settling on the Res Ref x2... back then. Since however, the SR Acoustic Ref active in their tesla series does edge out the Res ref near entirely save for the bass impact and more weighty feel the RR's provide. The SR AR do offer a tad more resolution and near the bass of the RES REFs... and come across very naturally. Some say more analog like, but on that point I'd have to pass as I've no analog gear.

The SX's lay somewhere in between the SR AR & SR RR but are more naturall than either of the SR wires. With a high res system, the SX + either AR or RR will indeed satisfy... duller systems might not respond as well... for ex. SET like sounding gear whose fingerprint is way lush, perhaps... and that's just speculation on my part given the way they handle sonics.

With the SX in there somewhere (it's usual place is on a source but I've found it works well as a main too), re-creation of the original venue is clearly evident, as well as is a more organic presentation.

One last note on the SX Ltd. is they reject EMI & RF well indeed for SE cables and act more like XLRs in that respect. they're quite clean sounding and without air flowing radiations or artifacts... and I'm using my SX as a main IC.