I think you will find the SPM is warmer. Also better balanced from top to bottom.
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SPM is 12 gauge, RD revII is 13 AWG, BTW. But unless you're seeing a 2 ohm load in the lower octaves I wouldn't expect a driveability change at only 3 meters. I use RedDawn II quite successfully, and do NOT hear a difference if it's doubled up (11AWG), so any warmth attributed to SPM must be due to its slightly-different extrusion composition and geometry? I've been told that there's a greater difference between the ICs than the speaker cable, so I'm not tempted to upgrade the cables. I use balanced long IC pre-to-power, and won't change them either...but I'm about to swap out my 1m RCA CDP RDII for something a bit warmer. Come to think of it, my system is slightly warmer when using FM, so the leanness must be the CDP and/or its IC. The difference in cost between RDrevII and SPM speaker cables seems prohibitive, but that's my admittedly naive sense of value.
Just seems to me that $$ spent upstream offer greater benefit. Would you keep me posted on your progress? Thanks. Ernie
Thanks for the responses, I received a e-mail directly from Nordost and they said that the Red Dawn Rev 11 offers 90 - 95 percent of the SPM and my budget and listening preferences should determine which one to use. Looking at a used pair of bi-wire SPM vs a new pair of Red Dawn 11(new product line and haven't found a use pair for sell yet)After looking at the cost, trying to find a way to make my 2 meter cable work. I bought my Red Dawn new and the best used price is probably 60 per cent of what I paid. Even the used SPM are in the 1250-1700.00 range.Again thanks and good listening.