Recommendation for an audiophile speaker cord that is not "bright"?

I had my McIntosh C2500 tube preamp mated to a Conrad-Johnson MF2550 solid state amp.  Sounded horrible unless you like the sound slow and syrupy.  The McIntosh MC152 and now the MC302 sound incredible with the C2500 preamp.  

ruraltraumasurgeon OP14 posts12-22-2019 3:24pmQuite an interesting discussion. A few things on my end:

1. My current speaker cables are labeled "Transparent high performance 10-2 10 AWG (upgradeable)."
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You will not believe this until you hear it, but even if those cables are a quite heavy gauge they are still unable to let the amp breath freely. Several thin conductors will perform like thin conductors even if they represent a low R. 
**Unlike the other participants here I`m speaking out of years of experience and not what I "think" or feel.
This simple speakercable-trick is the biggest uppgrade anyone can do to a good system, even if solid core pc`s represent a gamechanger too.

audiozenology134 posts12-22-2019 9:24amSo pretty much you are ignoring that voice coil resistance and impedance is part of the circuit ....right, gotcha. So basically that 7awg number is made up.
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Think again. The voicecoil is not a part of any circuit, it is the powerconsumer at the end of the circuit. 

So pretty much you are "arguing" from a point of complete ignorance w.r.t. electronic circuits. Got it. Carry on.