I've tried a bunch of speaker wire in the past...solid core, litz, magnet wire (anti-cable type), various gauges, Kimber 4TC (very nice), CAT6...by no means an exhaustive list, but pretty deep.
Nothing compares to the Alpha-Core MI-2. Nothing. It's the only speaker cable that was a definitive upgrade - all others were mostly sideways. It has the lowest inductance of any wire in existence, and probably the highest capacitance (not an issue for good, modern power amps as it is with preamps and line level components; in fact, it may be a great asset with high level signals). Bass is simply tremendous.
When you think of a speaker wire as an actual extension of your speaker that leads right to your speaker inductor, and know of the profound affect using Alpha-Core inductors mean (minimal skin loss, high q, low FM distortion, low hysteresis) to the sonic picture, you'll get why the Alpha-Core cable wire is so good.
The Alpha-Core IC's use the same technology, but are not recommended. High capacitance is NOT what is needed in that link between components.
I cryo'ed it, too, on my own...didn't notice any betterment from having done so.
It's not a lot of money, either (by inflated audiophool standards). $200.00 gets you about a 8' run terminated in your choice of ends by Alpha-Core (or dealer). And, It's got a 30 day money back guarantee.